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Brackish to saline groundwater in arid environments encourages the development and sustainability of inland freshwater lenses (IFLs). While these freshwater resources supply much-needed drinking water throughout the Arabian Peninsula and other drylands, little is understood about their sustainability. This study presents a numerical model using the SEAWAT programming code (i.e., MODFLOW and the Modular Three-Dimensional Multispecies Transport Model (MT3DMS)) to simulate IFL transient evolution. The numerical model is based on a physical laboratory model and calibrated using results from simulations conducted in a previous study of the Raudhatain IFL in northern Kuwait. Data from three previously conducted physical model simulations were evaluated against the corresponding numerical model simulations. The hydraulic conductivities in the horizontal and vertical directions were successfully optimized to minimize the objective function of the numerical model simulations. The numerical model matched observed IFL water levels at four locations through time, as well as IFL thicknesses and lengths (R2 = 0.89, 0.94, 0.85). Predicted lens degradation times corresponded to the observed lenses, which demonstrated the utility of numerical models and physical models to assess IFL geometry and position. Improved understanding of IFL dynamics provides water-resource exploration and development opportunities in drylands throughout the Arabian Peninsula and elsewhere with similar environmental settings.
Rachel Rotz; Adam Milewski; Todd C Rasmussen. Transient Evolution of Inland Freshwater Lenses: Comparison of Numerical and Physical Experiments. Water 2020, 12, 1154 .
AMA StyleRachel Rotz, Adam Milewski, Todd C Rasmussen. Transient Evolution of Inland Freshwater Lenses: Comparison of Numerical and Physical Experiments. Water. 2020; 12 (4):1154.
Chicago/Turabian StyleRachel Rotz; Adam Milewski; Todd C Rasmussen. 2020. "Transient Evolution of Inland Freshwater Lenses: Comparison of Numerical and Physical Experiments." Water 12, no. 4: 1154.
Algal blooms, especially those composed of toxic phytoplankton, are a global threat to eutrophic and mesotrophic freshwater reservoirs. While extreme hydrologic events such as flooding and drought have been shown to control bloom onset and success, the spatiotemporal dynamics of these relationships are still unclear for mesotrophic reservoirs. In this study, the relationships between hydrologic events and phytoplankton in Lake Allatoona and Lake Lanier, Georgia, United States, were characterized using historical and satellite datasets from 2008 to 2017 and statistical modeling. Results showed that the impact of stormflow and rainstorm events varied systematically from riverine to lacustrine reaches of the two reservoirs on weekly and monthly scales. Precipitation duration and stormflow were the most significant and best-fitting predictors of algal bloom biomass in deeper reaches of the two reservoirs, suggesting that algal blooms in more lacustrine environments may be better equipped for wet and stormy regimes than has been previously hypothesized.
Abigail S. Knapp; Adam M. Milewski. Spatiotemporal Relationships of Phytoplankton Blooms, Drought, and Rainstorms in Freshwater Reservoirs. Water 2020, 12, 404 .
AMA StyleAbigail S. Knapp, Adam M. Milewski. Spatiotemporal Relationships of Phytoplankton Blooms, Drought, and Rainstorms in Freshwater Reservoirs. Water. 2020; 12 (2):404.
Chicago/Turabian StyleAbigail S. Knapp; Adam M. Milewski. 2020. "Spatiotemporal Relationships of Phytoplankton Blooms, Drought, and Rainstorms in Freshwater Reservoirs." Water 12, no. 2: 404.
Composite indicators are popular tools for assessing and comparing multidimensional phenomena in different countries. This paper tests the methodology of the Groundwater Risk Index (GRI), a water vulnerability composite index developed to evaluate groundwater depletion in the Middle East and North Africa (MENA) region (Lezzaik et al. 2018). A sensitivity analysis using a one-factor-at-a-time (OFAT) approach is used to determine the impact of alternate methodological choices on country-level GRI scores and ranks. The analysis focuses on the GRI sensitivity to: (1) the selection of constituent indicators; (2) the choice of normalization scheme; and (3) the choice of aggregation method. Results show that the GRI scores are not impacted by the selection of indicators and the choice of alternative normalization schemes. Conversely, the GRI was sensitive to arithmetic and multiplicative aggregation methods. High-income, oil-rich gulf countries exhibited decreases in rankings due to an imbalance between water resource allocations and adaptive capacity parameters, whereas countries with balanced conditions exhibited increases in the GRI rankings. The sensitivity analysis provides useful insights into the development of GRI for end-users to assess the effects of groundwater vulnerability against potential changes or stressors in semi-arid to hyper-arid regions.
Adam Milewski; Khalil Lezzaik; Rachel Rotz. Sensitivity Analysis of the Groundwater Risk Index in the Middle East and North Africa Region. Environmental Processes 2020, 7, 53 -71.
AMA StyleAdam Milewski, Khalil Lezzaik, Rachel Rotz. Sensitivity Analysis of the Groundwater Risk Index in the Middle East and North Africa Region. Environmental Processes. 2020; 7 (1):53-71.
Chicago/Turabian StyleAdam Milewski; Khalil Lezzaik; Rachel Rotz. 2020. "Sensitivity Analysis of the Groundwater Risk Index in the Middle East and North Africa Region." Environmental Processes 7, no. 1: 53-71.
Natural and human-induced impacts on water resources across the globe continue to negatively impact water resources. Characterizing the hydrologic sensitivity to climatic and anthropogenic changes is problematic given the lack of monitoring networks and global-scale model uncertainties. This study presents an integrated methodology combining satellite remote sensing (e.g., GRACE, TRMM), hydrologic modeling (e.g., SWAT), and climate projections (IPCC AR5), to evaluate the impact of climatic and man-made changes on groundwater and surface water resources. The approach was carried out on two scales: regional (Morocco) and watershed (Souss Basin, Morocco) to capture the recent climatic changes in precipitation and total water storage, examine current and projected impacts on total water resources (surface and groundwater), and investigate the link between climate change and groundwater resources. Simulated (1979–2014) potential renewable groundwater resources obtained from SWAT are ~4.3 × 108 m3/yr. GRACE data (2002–2016) indicates a decline in total water storage anomaly of ~0.019m/yr., while precipitation remains relatively constant through the same time period (2002–2016), suggesting human interactions as the major underlying cause of depleting groundwater reserves. Results highlight the need for further conservation of diminishing groundwater resources and a more complete understanding of the links and impacts of climate change on groundwater resources.
Adam Milewski; Wondwosen M. Seyoum; Racha Elkadiri; Michael Durham. Multi-Scale Hydrologic Sensitivity to Climatic and Anthropogenic Changes in Northern Morocco. Geosciences 2019, 10, 13 .
AMA StyleAdam Milewski, Wondwosen M. Seyoum, Racha Elkadiri, Michael Durham. Multi-Scale Hydrologic Sensitivity to Climatic and Anthropogenic Changes in Northern Morocco. Geosciences. 2019; 10 (1):13.
Chicago/Turabian StyleAdam Milewski; Wondwosen M. Seyoum; Racha Elkadiri; Michael Durham. 2019. "Multi-Scale Hydrologic Sensitivity to Climatic and Anthropogenic Changes in Northern Morocco." Geosciences 10, no. 1: 13.
Accurate assessments of groundwater resources in major aquifers across the globe are crucial for sustainable management of freshwater reservoirs. Observations from the Gravity Recovery and Climate Experiment (GRACE) satellite have become invaluable as a means to identify regions groundwater change. While there is a large body of research that focuses on downscaling coarse (1°) GRACE products, few studies have attempted to spatially downscale GRACE to produce fine resolution (5 km) maps that are more useful to resource managers. This study trained a boosted regression tree model to statistically downscale GRACE total water storage anomaly to monthly 5 km groundwater level anomaly maps in the karstic upper Floridan aquifer (UFA) using multiple hydrologic datasets. Evaluation of spatial predictions with existing groundwater wells indicated satisfactory performance (R = 0.79, NSE = 0.61). Results demonstrate that groundwater levels were stable between 2002–2016 but varied seasonally. The data also highlights areas where groundwater pumping is exacerbating UFA water-level declines. While results demonstrate the applicability of machine learning based methods for spatial downscaling of GRACE data, future studies should account for preferential flowpaths (i.e., conduits, lineaments) in karstic systems.
Adam M. Milewski; Matthew B. Thomas; Wondwosen M. Seyoum; Todd C. Rasmussen. Spatial Downscaling of GRACE TWSA Data to Identify Spatiotemporal Groundwater Level Trends in the Upper Floridan Aquifer, Georgia, USA. Remote Sensing 2019, 11, 2756 .
AMA StyleAdam M. Milewski, Matthew B. Thomas, Wondwosen M. Seyoum, Todd C. Rasmussen. Spatial Downscaling of GRACE TWSA Data to Identify Spatiotemporal Groundwater Level Trends in the Upper Floridan Aquifer, Georgia, USA. Remote Sensing. 2019; 11 (23):2756.
Chicago/Turabian StyleAdam M. Milewski; Matthew B. Thomas; Wondwosen M. Seyoum; Todd C. Rasmussen. 2019. "Spatial Downscaling of GRACE TWSA Data to Identify Spatiotemporal Groundwater Level Trends in the Upper Floridan Aquifer, Georgia, USA." Remote Sensing 11, no. 23: 2756.
Upper-Brantas watershed in East Java, Indonesia, is a tropical watershed experiencing rapid landscape change, a phenomenon typical to developing countries. This study demonstrates the impact of Land Use Land Cover (LULC) changes on surface runoff in a tropical, urbanized, and data scarce watershed. The LULC changes were quantified between 1995 and 2015 and their impact on the hydrological processes was analyzed using the Soil and Water Assessment Tool (SWAT) model. During the study period, the watershed experienced an increase in settlement and dryland agriculture, and a decrease in the forest, rice field, and sugarcane plantation. The SWAT model results for the calibration (2003–2008) and validation (2009–2013) periods matched observed values [R2 > 0.91 and NSE (Nash-Sutcliffe Efficiency) >0.91]. In the long-term, the model predicted changes in runoff (+8%), water yield (+0.28%), groundwater (−1.8%), and evapotranspiration (−1.15%) due to changes in LULC. LULC changes showed a linear relationship with runoff generation, and the most significant factors affecting surface runoff were changes in the forest, agriculture, and settlements. Increasing urbanization, industrialization, and agricultural intensification will increase runoff which in turn will enhance the flow of nutrients and sediments into the water bodies.
Ike Sari Astuti; KamalaKanta Sahoo; Adam Milewski; Deepak Mishra. Impact of Land Use Land Cover (LULC) Change on Surface Runoff in an Increasingly Urbanized Tropical Watershed. Water Resources Management 2019, 33, 4087 -4103.
AMA StyleIke Sari Astuti, KamalaKanta Sahoo, Adam Milewski, Deepak Mishra. Impact of Land Use Land Cover (LULC) Change on Surface Runoff in an Increasingly Urbanized Tropical Watershed. Water Resources Management. 2019; 33 (12):4087-4103.
Chicago/Turabian StyleIke Sari Astuti; KamalaKanta Sahoo; Adam Milewski; Deepak Mishra. 2019. "Impact of Land Use Land Cover (LULC) Change on Surface Runoff in an Increasingly Urbanized Tropical Watershed." Water Resources Management 33, no. 12: 4087-4103.
With continued threat from climate change and human impacts, high-resolution and continuous hydrologic data accessibility has a paramount importance for predicting trends and availability of water resources. This study presents a novel machine learning (ML)-based downscaling algorithm that produces a high spatial resolution groundwater level anomaly (GWLA) from the Gravity Recovery and Climate Experiment (GRACE) data by utilizing the relationship between Terrestrial Water Storage Anomaly (TWSA) from GRACE and other land surface and hydro-climatic variables (e.g., vegetation coverage, land surface temperature, precipitation, streamflow, and in-situ groundwater level data). The predicted downscaled GWLA data were tested using monthly in-situ groundwater level observations. Of the 32 groundwater monitoring wells available in the study site, 21 wells were used to develop the ML-based downscaling model, while the remaining 11 wells were used to assess the performance of the ML-based downscaling model. The test results showed that the model satisfactorily reproduces the spatial and temporal variation of the GWLA in the area, with acceptable correlation coefficient and Nash-Sutcliffe Efficiency values of ~0.76 and ~0.45, respectively. GRACE TWSA was the most influential predictor variable in the models, followed by stream discharge and soil moisture storage. Though model limitations and uncertainty could exist due to high spatial heterogeneity of the geologic materials and omission of human impact (e.g., abstraction), the significance of the result is undeniable, particularly in areas where in-situ well measurements are sparse.
Wondwosen M. Seyoum; Dongjae Kwon; Adam M. Milewski. Downscaling GRACE TWSA Data into High-Resolution Groundwater Level Anomaly Using Machine Learning-Based Models in a Glacial Aquifer System. Remote Sensing 2019, 11, 824 .
AMA StyleWondwosen M. Seyoum, Dongjae Kwon, Adam M. Milewski. Downscaling GRACE TWSA Data into High-Resolution Groundwater Level Anomaly Using Machine Learning-Based Models in a Glacial Aquifer System. Remote Sensing. 2019; 11 (7):824.
Chicago/Turabian StyleWondwosen M. Seyoum; Dongjae Kwon; Adam M. Milewski. 2019. "Downscaling GRACE TWSA Data into High-Resolution Groundwater Level Anomaly Using Machine Learning-Based Models in a Glacial Aquifer System." Remote Sensing 11, no. 7: 824.
Strip-mined land (SML) disturbed by coal mining is a non-crop land resource that can be utilized to cultivate high-yielding energy crops such as miscanthus for bioenergy applications. However, the biomass yield potential, annual availability, and environmental impacts of growing energy crops in SML are less understood. In this study, we estimated the yield potential of miscanthus (Miscanthus sinensis) in SML and its environmental impacts on local streams using the Soil and Water Assessment Tool (SWAT). After calibration and validation of the SWAT model, the results demonstrated that miscanthus yield potentials were 2.6 (0.8−5.53), 10.0 (1.3−16.0), and 16.0 (1.34−26.0) Mg ha−1 with fertilizer application rates of 0, 100, and 200 kg-N ha−1, respectively. Furthermore, cultivation of miscanthus in SML has the potential to reduce sediment (~20%) and nitrate (2.5−10.0%) loads reaching water streams, with a marginal increase in phosphorus load. The available SML in the United States could produce about 10 to 16 dry Tg of biomass per year without negatively impacting the water quality. In conclusion, SML can provide a unique opportunity to produce biomass for bioenergy applications, while improving stream water quality in a highly dense mining area (the Appalachian region) in the United States.
KamalaKanta Sahoo; Adam M. Milewski; Sudhagar Mani; Nahal Hoghooghi; Sudhanshu Sekhar Panda. Assessment of Miscanthus Yield Potential from Strip-Mined Lands (SML) and Its Impacts on Stream Water Quality. Water 2019, 11, 546 .
AMA StyleKamalaKanta Sahoo, Adam M. Milewski, Sudhagar Mani, Nahal Hoghooghi, Sudhanshu Sekhar Panda. Assessment of Miscanthus Yield Potential from Strip-Mined Lands (SML) and Its Impacts on Stream Water Quality. Water. 2019; 11 (3):546.
Chicago/Turabian StyleKamalaKanta Sahoo; Adam M. Milewski; Sudhagar Mani; Nahal Hoghooghi; Sudhanshu Sekhar Panda. 2019. "Assessment of Miscanthus Yield Potential from Strip-Mined Lands (SML) and Its Impacts on Stream Water Quality." Water 11, no. 3: 546.
Dryland inland freshwater lenses (IFLs) that have been topographically induced are represented using physically modeled laboratory simulations, to characterize the stages of IFL evolution (i.e. formation, migration, degradation) as a function of recharge rate. Arid regions with shallow brackish to saline groundwater possess IFLs. The position and geometry (i.e. thickness, length) of IFLs over varying temporal and spatial scales is poorly understood due to their transient nature. The physically modeled IFLs in this study formed from an initial recharge pulse, after which IFL geometry was measured over time as it flowed in the direction of simulated groundwater flow. The time required for an IFL to reach the maximum thickness exhibited a negative exponential correlation to recharge rate. At IFL formation, thickness and length were positively correlated, and the ratio of IFL thickness to length exhibited a positive exponential correlation to recharge rate. After IFL formation, the central position of the simulated IFLs migrated laterally in the direction of groundwater flow at a velocity less than the range of applied recharge rates and greater than the groundwater flow velocities. The time required for the IFL to reach a minimum thickness, or IFL degradation, exhibited a positive exponential correlation to recharge rate. The Dupuit-Ghyben-Herzberg solution used to model coastal freshwater lens thickness was tested against the physically modeled IFLs and deemed invalid. A correction factor and modified solution are provided to predict IFL thickness, providing motivation for future analytical and numerical studies on inland variable-density groundwater systems in arid regions globally. Les lentilles d’eau douce continentales (LEDC) en terrains arides qui ont été induites par la topographie sont représentées au moyen de simulations de laboratoire sur modèle physique, afin de caractériser les étapes de l’évolution de la LEDC (c’est à dire sa formation, sa migration, sa dégradation) en fonction du taux de recharge. Les régions arides ayant des eaux souterraines peu profondes saumâtres à salées présentent des LEDC. La position et la géométrie (c’est-à-dire l’épaisseur, la longueur) des LEDC à des échelles de temps et d’espace variées sont mal comprises en raison de leur nature transitoire. Les LEDC modélisées physiquement dans cette étude ont été générées sous l’impulsion d’une recharge initiale, après quoi la géométrie de la LEDC a été mesurée sur la durée pendant qu’elle se déplaçait dans la direction de l’écoulement souterrain simulé. Le temps nécessaire à une LEDC pour atteindre son épaisseur maximale affichait une corrélation exponentielle négative avec le taux de recharge. Au moment où la LEDC se formait, l’épaisseur et la longueur étaient corrélées positivement et le rapport de l’épaisseur de la LEDC à sa longueur montrait une corrélation exponentielle positive avec le taux de la recharge. Après la formation de la LEDC, la position d’abord centrale des LEDC simulées a migré latéralement en suivant la direction des écoulements d’eau souterraine à une vitesse inférieure à la variation des taux de recharge appliqués et supérieure aux vitesses d’écoulement des eaux souterraines. Le temps nécessaire à la LEDC pour atteindre une épaisseur minimale ou sa dégradation, affichait une corrélation exponentielle positive avec le taux de recharge. La solution de Dupuit-Ghyben-Herzberg utilisée pour modéliser l’épaisseur de lentilles d’eau douce côtières a été testée en les confrontant aux LEDC simulées physiquement et jugée non valide. Un facteur de correction et une solution modifiée ont été fournis afin de prédire l’épaisseur de la LEDC, constituant un encouragement pour les futures études analytiques et numériques des systèmes hydrogéologiques continentaux d’épaisseur variable dans les régions arides du monde. Las lentes de agua dulce continentales de zonas áridas (IFL) que han sido inducidas topográficamente se representan mediante simulaciones de laboratorio con modelos físicos, para caracterizar las etapas de la evolución de las IFL (es decir, formación, migración, degradación) en función de la tasa de recarga. Las regiones áridas con aguas subterráneas superficiales salobres a salinas poseen LFI. La posición y la geometría (es decir, el espesor y la longitud) de las IFL a lo largo de escalas temporales y espaciales variables no se comprenden bien debido a su naturaleza transitoria. Las IFLs modelados físicamente en este estudio se formaron a partir de un pulso de recarga inicial, después del cual se midió la geometría de las IFL a lo largo del tiempo a medida que fluía en la dirección del flujo simulado de agua subterránea. El tiempo necesario para que una IFL alcance el espesor máximo mostró una correlación exponencial negativa con la velocidad de la recarga. En la formación de la IFL, el espesor y la longitud se correlacionaron positivamente, y la relación entre el espesor y la longitud de IFL mostró una correlación exponencial positiva con la tasa de recarga. Después de la formación de IFL, la posición central de las IFLs simuladas migró lateralmente en la dirección del flujo de agua subterránea a una velocidad menor que el rango de tasas de recarga aplicadas y mayor que las velocidades de flujo de agua subterránea. El tiempo requerido para que la IFL alcance un espesor mínimo, o degradación del IFL, mostró una correlación exponencial positiva con la tasa de recarga. La solución Dupuit-Ghyben-Herzberg utilizada para modelar el espesor de la lente de agua dulce costera fue probada contra las IFLs modeladas físicamente y se consideró inválida. Se proporciona un factor de corrección y una solución modificada para predecir el espesor de la IFL, lo que motiva futuros estudios analíticos y numéricos sobre los sistemas de...
R. R. Rotz; A. M. Milewski. Physical modeling of inland freshwater lens formation and evolution in drylands. Hydrogeology Journal 2019, 27, 1597 -1610.
AMA StyleR. R. Rotz, A. M. Milewski. Physical modeling of inland freshwater lens formation and evolution in drylands. Hydrogeology Journal. 2019; 27 (5):1597-1610.
Chicago/Turabian StyleR. R. Rotz; A. M. Milewski. 2019. "Physical modeling of inland freshwater lens formation and evolution in drylands." Hydrogeology Journal 27, no. 5: 1597-1610.
Strip-mined land (SML) disturbed by coal-mining is the non-crop land resource that can be utilized to cultivate high-yielding energy crops such as miscanthus for bioenergy applications. However, the biomass yield potential, annual availability and environmental impacts on growing energy crops in SML are less understood. In this study, we estimated the yield potential of miscanthus (Miscanthus sinensis) in SML and its environmental impacts on local streams using the Soil and Water Assessment Tool (SWAT). After calibration and validation of the SWAT model, the results demonstrated that miscanthus yield potentials were 2.6 (0.8−5.53), 10.0 (1.3−16.0) and 16.0 (1.34−26.0) Mg ha-1 with the fertilizer application rate of 0, 100, and 200 kg-N ha-1 respectively. Furthermore, cultivation of miscanthus in the SML has the potential to reduce sediment (~20%) and nitrate (2.5%−10.0 %) loads reaching to water streams with a marginal increase in phosphorus load. The available SML in the United States could produce about 10 to 16 dry Tg of biomass per year without negatively impacting the water quality. In conclusion, SML can provide a unique opportunity to produce biomass for bioenergy applications, while improving stream water quality in highly dense mining area (the Appalachian region) in the United States.
KamalaKanta Sahoo; Sudhagar Mani; Adam M. Milewski; Nahal Hoghooghi; Sudhanshu Sekhar Panda. Assessment of Miscanthus Yield Potential from Strip-Mined Lands (SML) and Its Impacts on Stream Water Quality. 2019, 1 .
AMA StyleKamalaKanta Sahoo, Sudhagar Mani, Adam M. Milewski, Nahal Hoghooghi, Sudhanshu Sekhar Panda. Assessment of Miscanthus Yield Potential from Strip-Mined Lands (SML) and Its Impacts on Stream Water Quality. . 2019; ():1.
Chicago/Turabian StyleKamalaKanta Sahoo; Sudhagar Mani; Adam M. Milewski; Nahal Hoghooghi; Sudhanshu Sekhar Panda. 2019. "Assessment of Miscanthus Yield Potential from Strip-Mined Lands (SML) and Its Impacts on Stream Water Quality." , no. : 1.
Overreliance on predominantly non-renewable groundwater resources and their subsequent depletion has given rise to adverse environmental, political, economic, and social effects. The high costs of groundwater depletion are exacerbated by the notable absence of tools designed to identify and diagnose areas at risk of groundwater degradation. In this study, a Groundwater Risk Index (GRI) was developed as a distributed composite index to assess and evaluate groundwater depletion risk by combining different environmental and socioeconomic datasets and models. GRI is designed to be used by end-users (e.g. governments, NGOs) as a multicriteria diagnostic tool to identify and determine the probability and severity of an entity experiencing the adverse effects of groundwater mining. Annual GRI results indicate that groundwater risk is highly dependent on governance and food security. Surprisingly, groundwater storage reserves were indeterminate of groundwater risk. Given the centrality of agricultural production in groundwater consumptive use, MENA countries are recommended to mitigate groundwater depletion by establishing reliable and secure virtual water transfers (agricultural trade) to achieve food security, as opposed to unsustainably exploiting finite water resources for short-term food sufficiency. The GRI's design choices, including adopting an equal weighting scheme and a linear additive aggregation approach, promote structural flexibility that enables the modification, application, and implementation of the index in other semi- to hyper-arid regions with a high level of dependency on groundwater resources.
Khalil Lezzaik; Adam Milewski; Jeffrey Mullen. The groundwater risk index: Development and application in the Middle East and North Africa region. Science of The Total Environment 2018, 628-629, 1149 -1164.
AMA StyleKhalil Lezzaik, Adam Milewski, Jeffrey Mullen. The groundwater risk index: Development and application in the Middle East and North Africa region. Science of The Total Environment. 2018; 628-629 ():1149-1164.
Chicago/Turabian StyleKhalil Lezzaik; Adam Milewski; Jeffrey Mullen. 2018. "The groundwater risk index: Development and application in the Middle East and North Africa region." Science of The Total Environment 628-629, no. : 1149-1164.
Efforts to evaluate sinkhole formation and quantify the controlling factors are hindered by the lack of historical observations or coarse resolution datasets in many areas. We applied recent advances in GIS-based sinkhole mapping and spatial statistics to comprehensively investigate the factors controlling sinkhole formation in the mantled karst setting of Dougherty County, Georgia. Sinkholes form at varying spatial and temporal scales within the test site. A three-stage methodology was conducted. Firstly, 275 sinkholes that formed or were enlarged between 1999 and 2011 were detected by comparing the results of sinkhole inventories derived from two DEMs acquired in 1999 and 2011. Additionally, a LiDAR DEM (1 m resolution) was used to gather a spatially detailed sinkhole inventory of 3412 sinkholes. The sinkhole inventory data was converted into sinkhole density maps for subsequent analyses. Ordinary least squares (OLS) and geographically weighted regression (GWR) spatial statistical models were applied to quantify the impact of controlling factors on sinkhole density. Controlling factors included geologic, hydrologic, anthropogenic, hydrogeologic, and geomorphologic variables. For the two sinkhole inventory datasets analyzed, overburden thickness, aquifer fluctuations, and proximity to fractures, streams, and wetlands were the most influential controlling factors on sinkhole formation (GWR p-values <0.05). Lastly, the spatial statistics results were used to 1) produce interpolated prediction sinkhole maps and 2) evaluate the accuracy of the spatial statistics' sinkhole density predictions. Results provide assessments of controlling factors on sinkhole formation and demonstrate the potential for similar applications in other karst areas with a time series of DEMs and similar ancillary datasets. The adapted GIS-based approach does not replace procedures that depend on comprehensive field surveys for both sinkhole inventory and controlling factor data acquisition, though it offers estimates for understanding sinkhole development over large areas to help select proper mitigation strategies.
Matthew D. Cahalan; Adam M. Milewski. Sinkhole formation mechanisms and geostatistical-based prediction analysis in a mantled karst terrain. CATENA 2018, 165, 333 -344.
AMA StyleMatthew D. Cahalan, Adam M. Milewski. Sinkhole formation mechanisms and geostatistical-based prediction analysis in a mantled karst terrain. CATENA. 2018; 165 ():333-344.
Chicago/Turabian StyleMatthew D. Cahalan; Adam M. Milewski. 2018. "Sinkhole formation mechanisms and geostatistical-based prediction analysis in a mantled karst terrain." CATENA 165, no. : 333-344.
The regional-scale consistency between four precipitation products from the GPCC, TRMM, WM, and CMORPH datasets over the Arabian Peninsula was assessed. Their macroscale relationships were inter-compared with soil moisture and total water storage (TWS) estimates from AMSR-E and GRACE. The consistency analysis was studied with multivariate statistical hypothesis testing and Pearson correlation metrics for the period from January 2000 to December 2010. The products and GRACE estimates were assessed over a representative sub-domain (United Arab Emirates) with available in situ well observations. Next, geographically temporally weighted regression (GTWR) was employed to examine the interdependencies among the peninsula’s hydrological components. The results showed GPCC-TRMM recording the highest correlation (0.85) with insignificant mean differences over more than 90% of the peninsula. The highest GTWR predictive performance of TWS (R2 = 0.84) was achieved with TRMM forcing, which indicates its potential to monitor changes in TWS over the arid peninsular region.
Youssef Wehbe; Marouane Temimi; Dawit T. Ghebreyesus; Adam Milewski; Hamid Norouzi; Elsy Ibrahim. Consistency of precipitation products over the Arabian Peninsula and interactions with soil moisture and water storage. Hydrological Sciences Journal 2018, 63, 408 -425.
AMA StyleYoussef Wehbe, Marouane Temimi, Dawit T. Ghebreyesus, Adam Milewski, Hamid Norouzi, Elsy Ibrahim. Consistency of precipitation products over the Arabian Peninsula and interactions with soil moisture and water storage. Hydrological Sciences Journal. 2018; 63 (3):408-425.
Chicago/Turabian StyleYoussef Wehbe; Marouane Temimi; Dawit T. Ghebreyesus; Adam Milewski; Hamid Norouzi; Elsy Ibrahim. 2018. "Consistency of precipitation products over the Arabian Peninsula and interactions with soil moisture and water storage." Hydrological Sciences Journal 63, no. 3: 408-425.
Dongjae Kwon; Illinois State University; Wondwosen Mekonnen Seyoum; Adam M. Milewski. PREDICTION OF GROUNDWATER LEVEL ANOMALY BASED ON GRACE AND WATER-BUDGET VARIABLES USING MACHINE LEARNING IN THE GLACIAL AQUIFER SYSTEM. 2018, 1 .
AMA StyleDongjae Kwon, Illinois State University, Wondwosen Mekonnen Seyoum, Adam M. Milewski. PREDICTION OF GROUNDWATER LEVEL ANOMALY BASED ON GRACE AND WATER-BUDGET VARIABLES USING MACHINE LEARNING IN THE GLACIAL AQUIFER SYSTEM. . 2018; ():1.
Chicago/Turabian StyleDongjae Kwon; Illinois State University; Wondwosen Mekonnen Seyoum; Adam M. Milewski. 2018. "PREDICTION OF GROUNDWATER LEVEL ANOMALY BASED ON GRACE AND WATER-BUDGET VARIABLES USING MACHINE LEARNING IN THE GLACIAL AQUIFER SYSTEM." , no. : 1.
Wondwosen Seyoum; Adam M. Milewski. Improved methods for estimating local terrestrial water dynamics from GRACE in the Northern High Plains. Advances in Water Resources 2017, 110, 279 -290.
AMA StyleWondwosen Seyoum, Adam M. Milewski. Improved methods for estimating local terrestrial water dynamics from GRACE in the Northern High Plains. Advances in Water Resources. 2017; 110 ():279-290.
Chicago/Turabian StyleWondwosen Seyoum; Adam M. Milewski. 2017. "Improved methods for estimating local terrestrial water dynamics from GRACE in the Northern High Plains." Advances in Water Resources 110, no. : 279-290.
The Middle East and North Africa (MENA) region is the world’s most water-stressed region, with its countries constituting 12 of the 15 most water-stressed countries globally. Because of data paucity, comprehensive regional-scale assessments of groundwater resources in the MENA region have been lacking. The presented study addresses this issue by using a distributed ArcGIS model, parametrized with gridded data sets, to estimate groundwater storage reserves in the region based on generated aquifer saturated thickness and effective porosity estimates. Furthermore, monthly gravimetric datasets (GRACE) and land surface parameters (GLDAS) were used to quantify changes in groundwater storage between 2003 and 2014. Total groundwater reserves in the region were estimated at 1.28 × 106 cubic kilometers (km3) with an uncertainty range between 816,000 and 1.93 × 106 km3. Most of the reserves are located within large sedimentary basins in North Africa and the Arabian Peninsula, with Algeria, Libya, Egypt, and Saudi Arabia accounting for approximately 75% of the region’s total freshwater reserves. Alternatively, small groundwater reserves were found in fractured Precambrian basement exposures. As for groundwater changes between 2003 and 2014, all MENA countries except for Morocco exhibited declines in groundwater storage. However, given the region’s large groundwater reserves, groundwater changes between 2003 and 2014 are minimal and represent no immediate short-term threat to the MENA region, with some exceptions. Notwithstanding this, the study recommends the development of sustainable and efficient groundwater management policies to optimally utilize the region’s groundwater resources, especially in the face of climate change, demographic expansion, and socio-economic development. La région du Moyen Orient et du Nord de l’Afrique (MENA) est la région du monde avec un stress hydrique le plus important, avec leurs pays constituant 12 des 15 pays du monde avec le stress hydrique le plus important. En raison de la pénurie de données, des évaluations globales à l’échelle régionale des ressources en eaux souterraines dans la région MENA font défaut. L’étude présentée traite de ce problème en utilisant un modèle ArcGIS distribué, paramétré avec des ensembles de données selon une grille, pour estimer les réserves des stockages d’eaux souterraines dans la région en fonction de l’épaisseur saturée de l’aquifère généré et des estimations de porosité efficace. En outre, les données gravimétriques mensuelles (GRACE) et les paramètres de le surface terrestre (GLDAS) ont été utilisés pour quantifier les variations du stock d’eaux souterraines entre 2003 et 2014. Les réserves totales d’eaux souterraines dans la région ont été estimées à 1.28×106 km3 avec uneplage d’incertitude comprise entre 816,000 et 1.93x106 km3. La plupart des réserves sont situées dans de grandsbassins sédimentaires en Afrique du Nord et dans la péninsule arabique, l’Algérie, la Libye, l’Egypte et l’ArabieSaoudite représentant environ 75% des réserves totale d’eau douce de la région. Sinon, de petites réservesd’eaux souterraines ont été trouvées dans des affleurement de formations fracturées de socle précambrien. En ce qui concerne les variations d’eaux souterraines entre 2003 et 2014, tous les pays de la région MENA, à l’exception du Maroc ont affiché des baisses de stock d’eaux souterraines. Cependant, étant donné les grandes réserves en eaux souterraines de la région, les variations des eaux souterraines entre 2003 et 2014 sont minimes et ne représentent aucune menace immédiate à court terme pour la région MENA, à quelques exceptions près. Malgré cela, l’étude recommande l’élaboration de politiques durables et efficaces de gestion des eaux souterraines afin d’utiliser de manière optimale les ressources en eaux souterraines, en particulier en contexte de changement climatique, de croissance démographique et de développement socio-économique. La región del Oriente Medio y África del Norte (MENA) es la región de mayor estrés hídrico en el mundo, con 12 de los 15 países que se constituyen en los de mayor estrés hídrico a nivel mundial. Debido a la escasez de datos, las evaluaciones a escala regional de los recursos de aguas subterráneas en la región MENA han sido escasas. El estudio presentado aborda esta cuestión utilizando un modelo distribuido de ArcGIS, parametrizado con conjuntos de datos en cuadrícula, para estimar las reservas de almacenamiento de agua subterránea en la región basándose en la generación de espesores saturados de los acuíferos y estimaciones de la porosidad efectiva. Además, se utilizaron conjuntos de datos gravimétricos mensuales (GRACE) y parámetros de superficie terrestre (GLDAS) para cuantificar los cambios en el almacenamiento del agua subterránea entre 2003 y 2014. Las reservas totales de agua subterránea en la región se estimaron en 1.28×106 kilómetros cúbicos (km3) con un margen de incertidumbre entre 816,000 y 1.93×106 km3. La mayor parte de las reservas se encuentran dentro de grandes cuencas sedimentarias en el Norte de África y en la Península Arábiga, con Argelia, Libia, Egipto y Arabia Saudita representando aproximadamente el 75% de las reservas totales de agua dulce de la región. Alternativamente, se encontraron pequeñas reservas de agua subterránea en afloramientos fracturados en el basamento precámbrico. En cuanto a los cambios en el agua subterránea entre 2003 y 2014, todos los países MENA excepto Marruecos mostraron una disminución en el almacenamiento de agua subterránea. Sin embargo, dado las grandes reservas de agua subterránea de la región, los cambios en el agua subterránea entre 2003 y 2014 son mínimos y no representan una amenaza inmediata a corto plazo para la región MENA, con algunas excepciones. No obstante, el estudio...
Khalil Lezzaik; Adam Milewski. A quantitative assessment of groundwater resources in the Middle East and North Africa region. Hydrogeology Journal 2017, 26, 251 -266.
AMA StyleKhalil Lezzaik, Adam Milewski. A quantitative assessment of groundwater resources in the Middle East and North Africa region. Hydrogeology Journal. 2017; 26 (1):251-266.
Chicago/Turabian StyleKhalil Lezzaik; Adam Milewski. 2017. "A quantitative assessment of groundwater resources in the Middle East and North Africa region." Hydrogeology Journal 26, no. 1: 251-266.
Study region: United Arab Emirates. Study focus: Numerous global precipitation products have been developed and calibrated. However, their performance over arid regions such as the United Arab Emirates (UAE) has been revealing notable differences triggered by a combination of climatic and terrestrial attributes. The objective of this study is to cross-validate and analyze the consistency of four global precipitation products from the GPCC, TRMM, WM, and CMORPH datasets over the UAE using a network of 53 rain gauges from 2000 to 2010. The spatial analysis of their consistency versus topography and land cover is expected to reveal the factors affecting the country’s rainfall regime. The study also identifies and calibrates the best statistically performing precipitation product as an essential climatic input for monitoring, forecasting, and modeling hydrologic applications over the UAE. New hydrological insights for the region: The UAE, similar to other dryland environments lacking adequate hydrologic monitoring networks, presents a unique area to evaluate satellite remote sensing products and the erratic spatiotemporal nature of precipitation in diverse environments. Statistical analyses indicate that the TMPA V7 precipitation products record the highest overall agreement with the observational network. Within the UAE, areas that receive high rainfall and fall within the vegetated highlands (e.g., >250 m), provide the most promise for incorporating satellite precipitation into hydrologic monitoring, modeling, or water resource management
Youssef Wehbe; Dawit Ghebreyesus; Marouane Temimi; Adam Milewski; Abdulla Al Mandous. Assessment of the consistency among global precipitation products over the United Arab Emirates. Journal of Hydrology: Regional Studies 2017, 12, 122 -135.
AMA StyleYoussef Wehbe, Dawit Ghebreyesus, Marouane Temimi, Adam Milewski, Abdulla Al Mandous. Assessment of the consistency among global precipitation products over the United Arab Emirates. Journal of Hydrology: Regional Studies. 2017; 12 ():122-135.
Chicago/Turabian StyleYoussef Wehbe; Dawit Ghebreyesus; Marouane Temimi; Adam Milewski; Abdulla Al Mandous. 2017. "Assessment of the consistency among global precipitation products over the United Arab Emirates." Journal of Hydrology: Regional Studies 12, no. : 122-135.
Adam M. Milewski; David S. Leigh. PALEOFLOODS IN THE TENNESSEE RIVER BASIN: RECORDS OF MEGAFLOODS USING TRACTIVE-LOAD DEPOSITS. GSA Annual Meeting in Seattle, Washington, USA - 2017 2017, 1 .
AMA StyleAdam M. Milewski, David S. Leigh. PALEOFLOODS IN THE TENNESSEE RIVER BASIN: RECORDS OF MEGAFLOODS USING TRACTIVE-LOAD DEPOSITS. GSA Annual Meeting in Seattle, Washington, USA - 2017. 2017; ():1.
Chicago/Turabian StyleAdam M. Milewski; David S. Leigh. 2017. "PALEOFLOODS IN THE TENNESSEE RIVER BASIN: RECORDS OF MEGAFLOODS USING TRACTIVE-LOAD DEPOSITS." GSA Annual Meeting in Seattle, Washington, USA - 2017 , no. : 1.
Wondwosen Seyoum; Adam M. Milewski. Monitoring and comparison of terrestrial water storage changes in the northern high plains using GRACE and in-situ based integrated hydrologic model estimates. Advances in Water Resources 2016, 94, 31 -44.
AMA StyleWondwosen Seyoum, Adam M. Milewski. Monitoring and comparison of terrestrial water storage changes in the northern high plains using GRACE and in-situ based integrated hydrologic model estimates. Advances in Water Resources. 2016; 94 ():31-44.
Chicago/Turabian StyleWondwosen Seyoum; Adam M. Milewski. 2016. "Monitoring and comparison of terrestrial water storage changes in the northern high plains using GRACE and in-situ based integrated hydrologic model estimates." Advances in Water Resources 94, no. : 31-44.
Le littoral algérien abrite des écosystèmes remarquables, dont des zones humides avec une haute valeur écologique. Mais rares sont ceux qui sont encore dans un bon état écologique. Exploitation excessive des ressources naturelles, urbanisation, faible conscience environnementale pour la préservation de ce patrimoine naturel sont les principales causes de leur dégradation. Depuis quelques années, une identification et un classement d’un certain nombre de ces zones dans le cadre de la convention de RAMSAR, la création d’aires marines protégées méditerranéennes ou la mise en œuvre d’une loi Littoral en 2002, reflètent une volonté de la part des gestionnaires, au niveau central, de protéger des sites littoraux algériens fragiles. Cependant, la forte pression sur les ressources naturelles, le décalage entre les niveaux de prise de décision (central, régional, local) et l’absence d’une gestion intégrée, rendent difficile l’application de toute mesure de sauvegarde durable. Dans cet article nous essayons de mettre en exergue, à travers le cas de la région de Terga, ces difficultés de protection et les enjeux qui entourent la gestion des milieux littoraux algériens. Deux principaux points sont développés ; le premier concerne les impacts environnementaux liés à l’extraction sablière et les difficultés d’application des mesures de préservation du patrimoine naturel et le second est consacré à l’analyse du jeu d’acteurs, aux conflits d’usages et à la mise en place d’outils de gestion. La méthode de travail adoptée est basée sur deux approches complémentaires : la diachronie pour suivre les modifications affectant le paysage dans le temps et le multiscalaire pour mieux comprendre les interactions entre actions anthropiques et facteurs environnementaux au niveau local, régional et national. L’utilisation des deux méthodes s’est basée sur des techniques diverses ; photo interprétation, analyses statistiques et modélisation, observation de terrain et entretiens avec les différents acteurs du territoire.
Tarik Ghodbani; Adam Milewski; Sid Ahmed Bellal. Un écosystème littoral fragile menacé sur la rive sud de la Méditerranée. Méditerranée 2015, 153 -164.
AMA StyleTarik Ghodbani, Adam Milewski, Sid Ahmed Bellal. Un écosystème littoral fragile menacé sur la rive sud de la Méditerranée. Méditerranée. 2015; (125):153-164.
Chicago/Turabian StyleTarik Ghodbani; Adam Milewski; Sid Ahmed Bellal. 2015. "Un écosystème littoral fragile menacé sur la rive sud de la Méditerranée." Méditerranée , no. 125: 153-164.