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Appropriate sediment management is required to improve the lifespan and productivity of reservoirs. Flushing operations to release part of the trapped sediment have therefore become increasingly common in practice. However, there is no clear methodology or guideline to assess their effectiveness. Numerical models are promising, but the lack of studies and data for validation presents a significant challenge. An opportunity to assess flushing operations is presented by the increasing number of dam removal interventions monitored for subsequent reservoir erosion and sediment displacement. Treating dam removal as an extreme case of sediment flushing, we use the case of the Marmot Dam removal to validate a two-dimensional morphodynamic model, which is then used for the study and optimization of sediment flushing operations. The results indicate that the software can be successfully used to design and optimize these types of operations notwithstanding some limitations in the quantification of released sediment volumes. Flushing appears to be more efficient if it starts just before the peak of a flood wave.
Sudesh Dahal; Alessandra Crosato; Amgad Y. A. Omer; Aaron A. Lee. Validation of Model-Based Optimization of Reservoir Sediment Releases by Dam Removal. Journal of Water Resources Planning and Management 2021, 147, 04021033 .
AMA StyleSudesh Dahal, Alessandra Crosato, Amgad Y. A. Omer, Aaron A. Lee. Validation of Model-Based Optimization of Reservoir Sediment Releases by Dam Removal. Journal of Water Resources Planning and Management. 2021; 147 (7):04021033.
Chicago/Turabian StyleSudesh Dahal; Alessandra Crosato; Amgad Y. A. Omer; Aaron A. Lee. 2021. "Validation of Model-Based Optimization of Reservoir Sediment Releases by Dam Removal." Journal of Water Resources Planning and Management 147, no. 7: 04021033.
Vessel‐induced waves affect the morphology and ecology of banks and shorelines around the world. In rivers used as waterways, ship passages contribute to the erosion of unprotected banks, but their short‐ and long‐term impacts remain unclear. This work investigates the effects of navigation on bank erosion along a reach of the regulated Meuse River with recently renaturalized banks. We apply UAV‐SfM photogrammetry, RTK‐GPS, acoustic Doppler velocimetry, aerial and terrestrial photography, soil tests, and multibeam echosounding to analyze the progression of bank retreat after riprap removal. After having analyzed the effects of ship‐generated waves and currents, floods, and vegetation dynamics, a process‐based model is proposed to estimate the long‐term bank retreat. The results show that a terrace evolves in length and depth across the bank according to local lithology, which we clustered in three types. Floods contribute to upper‐bank erosion‐inducing mass failures, while near‐bank flow appears increasingly ineffective to remove the failed material due to terrace elongation. Vegetation growth at the upper‐bank toe reduces bank failure and delays erosion, but its permanence is limited by terrace stability and efficiency to dissipate waves. The results also indicate that long‐term bank retreat is controlled by deep primary waves acting like bores over the terrace. Understanding the underlying drivers of bank evolution can support process‐based management to optimize the benefits of structural and functional diversity in navigable rivers.
G. Duró; A. Crosato; M. G. Kleinhans; D. Roelvink; W. S. J. Uijttewaal. Bank Erosion Processes in Regulated Navigable Rivers. Journal of Geophysical Research: Earth Surface 2020, 125, 1 .
AMA StyleG. Duró, A. Crosato, M. G. Kleinhans, D. Roelvink, W. S. J. Uijttewaal. Bank Erosion Processes in Regulated Navigable Rivers. Journal of Geophysical Research: Earth Surface. 2020; 125 (7):1.
Chicago/Turabian StyleG. Duró; A. Crosato; M. G. Kleinhans; D. Roelvink; W. S. J. Uijttewaal. 2020. "Bank Erosion Processes in Regulated Navigable Rivers." Journal of Geophysical Research: Earth Surface 125, no. 7: 1.
The Dutch River Waal, a branch of the Rhine, has been trained for centuries to mitigate the effects of ice-jams and improve navigation. The works, started in 1850, involved river straightening and narrowing by a series of transverse groynes. Besides fulfilling their goal, the groynes also created the need to raise flood protection works and caused undesirable channel incision. This study assesses the effectiveness of training the river with a longitudinal wall instead of with groynes. The investigation analyzes the long-term response of the historical river with a two-dimensional depth-averaged (2DH) morphodynamic model. The results show that the wall would create two parallel channels, one becoming deeper and the other one shallower. The former would be as suitable for navigation as an equally-wide channel obtained with groynes. The latter would contribute in conveying water during high flow events and improve the river ecology. Training the river with a wall would also lessen channel incision. The best performance is obtained if the wall is built on the channel centerline, starting just upstream of a point bar top.
T. B. Le; Alessandra Crosato; A. Montes Arboleda. Revisiting Waal River Training by Historical Reconstruction. Journal of Hydraulic Engineering 2020, 146, 05020002 .
AMA StyleT. B. Le, Alessandra Crosato, A. Montes Arboleda. Revisiting Waal River Training by Historical Reconstruction. Journal of Hydraulic Engineering. 2020; 146 (5):05020002.
Chicago/Turabian StyleT. B. Le; Alessandra Crosato; A. Montes Arboleda. 2020. "Revisiting Waal River Training by Historical Reconstruction." Journal of Hydraulic Engineering 146, no. 5: 05020002.
River training and river restoration often imply modifying the patterns and dimensions of bars, channels, and pools. Research since the 1980s has greatly advanced and matured our knowledge on the formation and behavior of river bars, thanks to field work, laboratory experiments, theoretical analyses, and numerical modelling by several research groups. However, this knowledge is not easily accessible to design engineers, river managers, and ecologists who need to apply it. This is mainly due to confusing differences in terminology as well as to difficult mathematical theories. Moreover, existing scientific publications generally focus on specific aspects, so an overall review of the findings and their applications is still lacking. In many cases, the knowledge achieved so far would allow minimizing hard engineering interventions and thus obtaining more natural rivers. We present an integrated review of the major findings of river bar studies. Our aim is to provide accessible state-of-the-art knowledge for nature-based bar management and successful river training and river restoration. To this end we review the results from analytical, numerical, experimental, and field studies, explain the background of bar theories, and discuss applications in river engineering and river restoration.
Alessandra Crosato; Erik Mosselman. An Integrated Review of River Bars for Engineering, Management and Transdisciplinary Research. Water 2020, 12, 596 .
AMA StyleAlessandra Crosato, Erik Mosselman. An Integrated Review of River Bars for Engineering, Management and Transdisciplinary Research. Water. 2020; 12 (2):596.
Chicago/Turabian StyleAlessandra Crosato; Erik Mosselman. 2020. "An Integrated Review of River Bars for Engineering, Management and Transdisciplinary Research." Water 12, no. 2: 596.
Distinct bankline patterns appeared after the removal of protection works along a navigable reach of the Meuse River. A series of oblique embayments now dominate the riverine landscape after ten years of bank erosion, but their location and asymmetry cannot be explained yet. This work analyses and integrates field measurements of flow, ship waves, bank composition, bed topography and historical maps to explain the observed patterns along two reaches of the river. An extraordinary low‐water‐level event generated by a ship accident provided the unique opportunity to also analyse the subaqueous bank topography. The results indicate that the formation of oblique embayments arises from the combination of floodplain heterogeneity, structured by scroll‐bar deposits, and the regulation of water levels, resulting in ship‐wave attack at a narrow range of bank elevation for 70% of the time. Substrate erodibility acts on the effectiveness of trees to slow down local bank erosion rates, which is possibly enhanced by a positive feedback between woody roots and cohesive soil. The strong regulation of water levels and the waves generated by the intense ship traffic produce an increasingly long mildly‐sloping terrace at the bank toe and progressively dominate the bank erosion process. This study demonstrates the important role of floodplain and scroll bar formation in shaping later bank erosion, which has implications for predictive numerical models, restoration strategies, and understanding the role of vegetation in bank erosion processes.
Gonzalo Duró; Alessandra Crosato; Maarten G. Kleinhans; Timotheus G. Winkels; Hessel A.G. Woolderink; Wim S.J. Uijttewaal. Distinct patterns of bank erosion in a navigable regulated river. Earth Surface Processes and Landforms 2019, 45, 361 -374.
AMA StyleGonzalo Duró, Alessandra Crosato, Maarten G. Kleinhans, Timotheus G. Winkels, Hessel A.G. Woolderink, Wim S.J. Uijttewaal. Distinct patterns of bank erosion in a navigable regulated river. Earth Surface Processes and Landforms. 2019; 45 (2):361-374.
Chicago/Turabian StyleGonzalo Duró; Alessandra Crosato; Maarten G. Kleinhans; Timotheus G. Winkels; Hessel A.G. Woolderink; Wim S.J. Uijttewaal. 2019. "Distinct patterns of bank erosion in a navigable regulated river." Earth Surface Processes and Landforms 45, no. 2: 361-374.
Andrés Vargas‐Luna; Gonzalo Duró; Alessandra Crosato; Wim Uijttewaal. Morphological Adaptation of River Channels to Vegetation Establishment: A Laboratory Study. Journal of Geophysical Research: Earth Surface 2019, 124, 1981 -1995.
AMA StyleAndrés Vargas‐Luna, Gonzalo Duró, Alessandra Crosato, Wim Uijttewaal. Morphological Adaptation of River Channels to Vegetation Establishment: A Laboratory Study. Journal of Geophysical Research: Earth Surface. 2019; 124 (7):1981-1995.
Chicago/Turabian StyleAndrés Vargas‐Luna; Gonzalo Duró; Alessandra Crosato; Wim Uijttewaal. 2019. "Morphological Adaptation of River Channels to Vegetation Establishment: A Laboratory Study." Journal of Geophysical Research: Earth Surface 124, no. 7: 1981-1995.
Rivers typically present heterogeneus bed material, but the effects of sediment non‐uniformity on river bar characteristics are still unclear. This work investigates the impact of sediment size heterogeneity on alternate bars with a morphodynamic numerical model. The model is firstly used to reproduce a laboratory experiment showing alternate bar formation with non‐uniform bed material. Subsequently, the influence of sediment size heterogeneity on alternate bars is investigated distinguishing hybrid from free bars, definition based on the presence/absence of morphodynamic forcing, considering the results of nine scenarios. In four of them, a transverse obstacle is used to generate forcing. The computations are carried out with the Telemac‐Mascaret system solving the two‐dimensional shallow‐water equations with a finite‐element approach, accounting for horizontal and vertical sediment sorting processes. The results show that sediment heterogeneity affects free migrating and hybrid bars in a different way. The difference lies in the presence/absence of a migration front, so that distinct relations between bed topography, bed shear stress and sediment sorting are obtained. Sediment sorting and associated planform redistribution of bed roughness only slightly modify free migrating bar morphodynamics, whereas hybrid bars are greatly impacted, with decreased amplitude and increased wavelength. Increased sediment size heterogeneity increases the degree of sediment sorting, while the sorting pattern remains the same for both free and hybrid bars. Moreover, it produces averagely higher, longer and faster free bars, while in the case of hybrid bars their wavelength is increased but no general trend can be determined for their amplitude.
F. Cordier; P. Tassi; N. Claude; A. Crosato; S. Rodrigues; D. Pham Van Bang. Numerical Study of Alternate Bars in Alluvial Channels With Nonuniform Sediment. Water Resources Research 2019, 55, 2976 -3003.
AMA StyleF. Cordier, P. Tassi, N. Claude, A. Crosato, S. Rodrigues, D. Pham Van Bang. Numerical Study of Alternate Bars in Alluvial Channels With Nonuniform Sediment. Water Resources Research. 2019; 55 (4):2976-3003.
Chicago/Turabian StyleF. Cordier; P. Tassi; N. Claude; A. Crosato; S. Rodrigues; D. Pham Van Bang. 2019. "Numerical Study of Alternate Bars in Alluvial Channels With Nonuniform Sediment." Water Resources Research 55, no. 4: 2976-3003.
We apply structure from motion (SfM) photogrammetry with imagery from an unmanned aerial vehicle (UAV) to measure bank erosion processes along a mid-sized river reach. This technique offers a unique set of characteristics compared to previously used methods to monitor banks, such as high resolution and relatively fast deployment in the field. We analyse the retreat of a 1.2 km restored bank of the Meuse River which has complex vertical scarps laying on a straight reach, features that present specific challenges to the UAV-SfM application. We surveyed eight times within a year with a simple approach, combining different photograph perspectives and overlaps to identify an effective UAV flight. The accuracy of the digital surface models (DSMs) was evaluated with real-time kinematic (RTK) GPS points and airborne laser scanning of the whole reach. An oblique perspective with eight photo overlaps and 20 m of cross-sectional ground-control point distribution was sufficient to achieve the relative precision to observation distance of ∼1 : 1400 and 3 cm root mean square error (RMSE), complying with the required accuracy. A complementary nadiral view increased coverage behind bank toe vegetation. Sequential DSMs captured signatures of the erosion cycle such as mass failures, slump-block deposition, and bank undermining. Although UAV-SfM requires low water levels and banks without dense vegetation as many other techniques, it is a fast-in-the-field alternative to survey reach-scale riverbanks in sufficient resolution and accuracy to quantify bank retreat and identify morphological features of the bank failure and erosion processes. Improvements to the adopted approach are recommended to achieve higher accuracies.
Gonzalo Duró; Alessandra Crosato; Maarten G. Kleinhans; Wim Uijttewaal. Bank erosion processes measured with UAV-SfM along complex banklines of a straight mid-sized river reach. Earth Surface Dynamics 2018, 6, 933 -953.
AMA StyleGonzalo Duró, Alessandra Crosato, Maarten G. Kleinhans, Wim Uijttewaal. Bank erosion processes measured with UAV-SfM along complex banklines of a straight mid-sized river reach. Earth Surface Dynamics. 2018; 6 (4):933-953.
Chicago/Turabian StyleGonzalo Duró; Alessandra Crosato; Maarten G. Kleinhans; Wim Uijttewaal. 2018. "Bank erosion processes measured with UAV-SfM along complex banklines of a straight mid-sized river reach." Earth Surface Dynamics 6, no. 4: 933-953.
Alluvial rivers are shaped by sequences of water flows excavating their channels. Observations show that besides the magnitude, also the frequency and duration of streamflow oscillations might be important for the river channel formation. In addition, the river morphology appears influenced also by both size and degree of uniformity of the sediment. Nevertheless, many morphodynamic studies still represent the flow regime with a single value of the discharge, often corresponding to the bankfull condition, and the sediment with its median grain size. This work investigates the effects of streamflow variability and sediment characteristics on channel width formation, analysing the evolution of experimental streams with different sediments and discharge hydrographs. Results show that the formative condition of the channel width is not the geometric bankfull flow but a rather frequent peak flow. Remarkably different channel configurations arise from different sediment characteristics in the laboratory, where sediment non-uniformity produces more stable banks.
Andrés Vargas-Luna; Alessandra Crosato; Protogene Byishimo; Wim Uijttewaal. Impact of flow variability and sediment characteristics on channel width evolution. E3S Web of Conferences 2018, 40, 05044 .
AMA StyleAndrés Vargas-Luna, Alessandra Crosato, Protogene Byishimo, Wim Uijttewaal. Impact of flow variability and sediment characteristics on channel width evolution. E3S Web of Conferences. 2018; 40 ():05044.
Chicago/Turabian StyleAndrés Vargas-Luna; Alessandra Crosato; Protogene Byishimo; Wim Uijttewaal. 2018. "Impact of flow variability and sediment characteristics on channel width evolution." E3S Web of Conferences 40, no. : 05044.
In recent years, many riverbanks in Europe had their protections removed to reactivate natural erosion processes and improve riparian habitats. Yet, other river functions may be affected, such as navigation and flood conveyance. The quantification and prediction of erosion rates and volumes is then relevant to manage and control the integrity of all river functions. This work studies the morphological evolution of riverbanks along two restored reaches of the Meuse River in the Netherlands, which are taken as case studies. This river is an important navigation route and for this its water level is strongly regulated with weirs. Through aerial photographs and two airborne LIDAR surveys, we analysed the evolution over nine years of restoration and reconstructed the topography along 2.2 km. of banks. An extraordinary low-water level after a ship accident provided the opportunity to observe and measure the bank toe. The banks show a terrace of erosion close to the normally regulated water level, highly irregular erosion rates up to 7 m/year, embayments evolving with upstream and downstream shifts, and sub-reaches with uniform erosion. Probable causes of erosion include ship-waves, high water flows and water level fluctuations. Distinct patterns might be explained by the presence of riparian trees and soil strata of different compositions. These intriguing case studies will continue to be studied to disentangle the role of different erosion drivers, predict erosion magnitudes and establish whether bank erosion will stop or continue in the future.
Gonzalo Duró; Alessandra Crosato; Maarten Kleinhans; Wim Uijttewaal. On the morphological evolution of restored banks: Case study of the Meuse river. E3S Web of Conferences 2018, 40, 02021 .
AMA StyleGonzalo Duró, Alessandra Crosato, Maarten Kleinhans, Wim Uijttewaal. On the morphological evolution of restored banks: Case study of the Meuse river. E3S Web of Conferences. 2018; 40 ():02021.
Chicago/Turabian StyleGonzalo Duró; Alessandra Crosato; Maarten Kleinhans; Wim Uijttewaal. 2018. "On the morphological evolution of restored banks: Case study of the Meuse river." E3S Web of Conferences 40, no. : 02021.
The meandering Ribb River flows in northwest Ethiopia to Lake Tana, the source of the Blue Nile River. The river has already undergone changes due to several human interventions, such as embanking, sand mining, water extraction and lake level regulation for hydropower. At present, a dam and a weir are under construction to store and divert water for irrigation. This will strongly alter both water and sediment discharges to the downstream river reaches, causing adjustments to the morphology. Assessing the current morphodynamic trends is the first necessary step to study the future effects and find ways to mitigate them. This paper presents an analysis of the current and past river based on newly collected data, aerial photographs, SPOT and Google Earth images. The riverbed changes are derived from historical staff gauge height analysis. The effects of sediment mining and water extraction are assessed using the theory of morphodynamic equilibrium. The findings of the analysis show a reduction of sediment transport capacity in the downstream direction, which has resulted in intense sediment deposition, resulting in blockage of the Lower River reach and subsequent channel avulsion. The effects of Lake Tana level regulation on the observed processes appear to be minor.
Chalachew A. Mulatu; Alessandra Crosato; Michael M. Moges; Eddy J. Langendoen; Michael McClain. Morphodynamic Trends of the Ribb River, Ethiopia, Prior to Dam Construction. Geosciences 2018, 8, 255 .
AMA StyleChalachew A. Mulatu, Alessandra Crosato, Michael M. Moges, Eddy J. Langendoen, Michael McClain. Morphodynamic Trends of the Ribb River, Ethiopia, Prior to Dam Construction. Geosciences. 2018; 8 (7):255.
Chicago/Turabian StyleChalachew A. Mulatu; Alessandra Crosato; Michael M. Moges; Eddy J. Langendoen; Michael McClain. 2018. "Morphodynamic Trends of the Ribb River, Ethiopia, Prior to Dam Construction." Geosciences 8, no. 7: 255.
Alluvial rivers are shaped by sequences of water flows excavating their channels. Observations show that besides the magnitude, the frequency and duration of streamflow oscillations might also be important for the river channel formation. In addition, the river morphology appears influenced by both size and degree of uniformity of the sediment. Nevertheless, many morphodynamic studies still represent the flow regime with a single value of the discharge, often corresponding to the bankfull condition, and the sediment with its median grain size. This work investigates the effects of streamflow variability and sediment characteristics on channel width formation, analysing the evolution of experimental streams with different sediments and discharge hydrographs. Results show that the formative condition of the channel width is not the geometric bankfull flow but a rather frequent peak flow. Remarkably different channel configurations arise from different sediment characteristics in the laboratory, where sediment non-uniformity produces more stable banks.
Andrés Vargas-Luna; Alessandra Crosato; Protogene Byishimo; Wim S. J. Uijttewaal. Impact of flow variability and sediment characteristics on channel width evolution in laboratory streams. Journal of Hydraulic Research 2018, 57, 51 -61.
AMA StyleAndrés Vargas-Luna, Alessandra Crosato, Protogene Byishimo, Wim S. J. Uijttewaal. Impact of flow variability and sediment characteristics on channel width evolution in laboratory streams. Journal of Hydraulic Research. 2018; 57 (1):51-61.
Chicago/Turabian StyleAndrés Vargas-Luna; Alessandra Crosato; Protogene Byishimo; Wim S. J. Uijttewaal. 2018. "Impact of flow variability and sediment characteristics on channel width evolution in laboratory streams." Journal of Hydraulic Research 57, no. 1: 51-61.
Diverse methods are currently available to measure river bank erosion at broad-ranging temporal and spatial scales. Yet, no technique provides low-cost and high-resolution to survey small-scale bank processes along a river reach. We investigate the capabilities of Structure-from-Motion photogrammetry applied with imagery from an Unmanned Aerial Vehicle (UAV) to describe the evolution of riverbank profiles in middle-size rivers. The bank erosion cycle is used as a reference to assess the applicability of different techniques. We surveyed 1.2 km of a restored bank of the Meuse River eight times within a year, combining different photograph perspectives and overlaps to identify an efficient UAV flight to monitor banks. The accuracy of the Digital Surface Models (DSMs) was evaluated compared with RTK GPS points and an Airborne Laser Scanning (ALS) of the whole reach. An oblique perspective with eight photo overlaps was sufficient to achieve the highest relative precision to observation distance of ~1:1400, with 10 cm error range. A complementary nadiral view increased coverage behind bank toe vegetation. The DSM and ALS had comparable accuracies except on banks, where the latter overestimates elevations. Sequential DSMs captured signatures of the erosion cycle such as mass failures, slump-block deposition, and bank undermining. Although this technique requires low water levels and banks without dense vegetation, it is a low-cost method to survey reach-scale riverbanks in sufficient resolution to quantify bank retreat and identify morphological features of the bank failure and erosion processes.
Gonzalo Duró; Alessandra Crosato; Maarten G. Kleinhans; Wim S. J. Uijttewaal. A low-cost technique to measure bank erosion proces ses along middle-size river reaches. 2018, 2018, 1 -28.
AMA StyleGonzalo Duró, Alessandra Crosato, Maarten G. Kleinhans, Wim S. J. Uijttewaal. A low-cost technique to measure bank erosion proces ses along middle-size river reaches. . 2018; 2018 ():1-28.
Chicago/Turabian StyleGonzalo Duró; Alessandra Crosato; Maarten G. Kleinhans; Wim S. J. Uijttewaal. 2018. "A low-cost technique to measure bank erosion proces ses along middle-size river reaches." 2018, no. : 1-28.
Thai Binh Le; Alessandra Crosato; E. Mosselman; W.S.J. Uijttewaal. On the stability of river bifurcations created by longitudinal training walls. Numerical investigation. Advances in Water Resources 2018, 113, 112 -125.
AMA StyleThai Binh Le, Alessandra Crosato, E. Mosselman, W.S.J. Uijttewaal. On the stability of river bifurcations created by longitudinal training walls. Numerical investigation. Advances in Water Resources. 2018; 113 ():112-125.
Chicago/Turabian StyleThai Binh Le; Alessandra Crosato; E. Mosselman; W.S.J. Uijttewaal. 2018. "On the stability of river bifurcations created by longitudinal training walls. Numerical investigation." Advances in Water Resources 113, no. : 112-125.
Rivers have been trained for centuries by channel narrowing and straightening. This caused important damages to their ecosystems, particularly around the bank areas. We analyse here the possibility to train rivers in a new way by subdividing their channel in main and ecological channel with a longitudinal training wall. The effectiveness of longitudinal training walls in achieving this goal and their long-term effects on the river morphology have not been thoroughly investigated yet. In particular, studies that assess the stability of the two parallel channels separated by the training wall are still lacking. This work studies the long-term morphological developments of river channels subdivided by a longitudinal training wall in the presence of steady alternate bars. This type of bars, common in alluvial rivers, alters the flow field and the sediment transport direction and might affect the stability of the bifurcating system. The work comprises both laboratory experiments and numerical simulations (Delft3D). The results show that a system of parallel channels divided by a longitudinal training wall has the tendency to become unstable. An important factor is found to be the location of the upstream termination of the longitudinal wall with respect to a neighboring steady bar. The relative widths of the two parallel channels separated by the wall and variable discharge do not substantially change the final evolution of the system.
T.B. Le; Alessandra Crosato; W.S.J. Uijttewaal. Long-term morphological developments of river channels separated by a longitudinal training wall. Advances in Water Resources 2018, 113, 73 -85.
AMA StyleT.B. Le, Alessandra Crosato, W.S.J. Uijttewaal. Long-term morphological developments of river channels separated by a longitudinal training wall. Advances in Water Resources. 2018; 113 ():73-85.
Chicago/Turabian StyleT.B. Le; Alessandra Crosato; W.S.J. Uijttewaal. 2018. "Long-term morphological developments of river channels separated by a longitudinal training wall." Advances in Water Resources 113, no. : 73-85.
The prediction of the morphological evolution of renaturalized streams is important for the success of restoration projects. Riparian vegetation is a key component of the riverine landscape and is therefore essential for the natural rehabilitation of rivers. This complicates the design of morphological interventions, since riparian vegetation is influenced by and influences the river dynamics. Morphodynamic models, useful tools for project planning, should therefore include the interaction between vegetation, water flow and sediment processes. Most restoration projects are carried out in U.S.A. and Europe, where rivers are highly intervened and where the climate is temperate and vegetation shows a clear seasonal cycle. Taking into account seasonal variations might therefore be relevant for the prediction of the river morphological adaptation. This study investigates the morphodynamic effects of riparian vegetation on a re-meandered lowland stream in the Netherlands, the Lunterse Beek. The work includes the analysis of field data covering 5 years and numerical modelling. The results allow assessing the performance of a modelling tool in predicting the morphological evolution of the stream and the relevance of including the seasonal variations of vegetation in the computations. After the establishment of herbaceous plants on its banks, the Lunterse Beek did not show any further changes in channel alignment. This is here attributed to the stabilizing effects of plant roots together with the small size of the stream. It is expected that the morphological restoration of similarly small streams may result in important initial morphological adaptation followed by negligible changes after full vegetation establishment.
Andrés Vargas-Luna; Alessandra Crosato; Niels Anders; Ton Hoitink; Saskia D. Keesstra; Wim Uijttewaal. Morphodynamic effects of riparian vegetation growth after stream restoration. Earth Surface Processes and Landforms 2018, 43, 1591 -1607.
AMA StyleAndrés Vargas-Luna, Alessandra Crosato, Niels Anders, Ton Hoitink, Saskia D. Keesstra, Wim Uijttewaal. Morphodynamic effects of riparian vegetation growth after stream restoration. Earth Surface Processes and Landforms. 2018; 43 (8):1591-1607.
Chicago/Turabian StyleAndrés Vargas-Luna; Alessandra Crosato; Niels Anders; Ton Hoitink; Saskia D. Keesstra; Wim Uijttewaal. 2018. "Morphodynamic effects of riparian vegetation growth after stream restoration." Earth Surface Processes and Landforms 43, no. 8: 1591-1607.
Sediment accumulation hampers optimal water resources management of reservoirs. In the Roseires Reservoir across the Blue Nile River, in Sudan, about 30% of the storage capacity has been lost by sedimentation before dam heightening (2012), despite regular sediment sluicing and flushing. At the same time, increasing soil erosion in the upper river basin in Ethiopia is significantly reducing land productivity.
Yasir S. A. Ali; Paolo Paron; Alessandra Crosato; Yasir A. Mohamed. Transboundary sediment transfer from source to sink using a mineralogical analysis. Case study: Roseires Reservoir, Blue Nile, Sudan. International Journal of River Basin Management 2017, 16, 477 -491.
AMA StyleYasir S. A. Ali, Paolo Paron, Alessandra Crosato, Yasir A. Mohamed. Transboundary sediment transfer from source to sink using a mineralogical analysis. Case study: Roseires Reservoir, Blue Nile, Sudan. International Journal of River Basin Management. 2017; 16 (4):477-491.
Chicago/Turabian StyleYasir S. A. Ali; Paolo Paron; Alessandra Crosato; Yasir A. Mohamed. 2017. "Transboundary sediment transfer from source to sink using a mineralogical analysis. Case study: Roseires Reservoir, Blue Nile, Sudan." International Journal of River Basin Management 16, no. 4: 477-491.
The effects of sediment heterogeneity and sediment mobility on the morphology of braided rivers are still poorly studied, especially when the partial sediment mobility occurs. Nevertheless, increasing the bed sediment heterogeneity by coarse sediment supply is becoming a common practice in river restoration projects and habitat improvement all over the world. This research provides a step forward in the identification of the effects of sediment sorting on the evolution of sediment bars and braiding geometry of gravel-bed rivers. A two-dimensional morphodynamic model was used to simulate the long-term developments of a hypothetical braided system with discharge regime and morphodynamic parameters derived from the Waimakariri River, New Zealand. Several scenarios, differing in bed sediment heterogeneity and sediment mobility, were considered. The results agree with the tendencies already identified in linear analyses and experimental studies, showing that a larger sediment heterogeneity increases the braiding indes and reduces the bars length and height. The analyses allowed identifying the applicability limits of uniform sediment and variable discharge modelling approaches.
Umesh Singh; Alessandra Crosato; Sanjay Giri; Murray Hicks. Sediment heterogeneity and mobility in the morphodynamic modelling of gravel-bed braided rivers. Advances in Water Resources 2017, 104, 127 -144.
AMA StyleUmesh Singh, Alessandra Crosato, Sanjay Giri, Murray Hicks. Sediment heterogeneity and mobility in the morphodynamic modelling of gravel-bed braided rivers. Advances in Water Resources. 2017; 104 ():127-144.
Chicago/Turabian StyleUmesh Singh; Alessandra Crosato; Sanjay Giri; Murray Hicks. 2017. "Sediment heterogeneity and mobility in the morphodynamic modelling of gravel-bed braided rivers." Advances in Water Resources 104, no. : 127-144.
Gonzalo Duró; Alessandra Crosato; Pablo Tassi. Numerical study on river bar response to spatial variations of channel width. Advances in Water Resources 2016, 93, 21 -38.
AMA StyleGonzalo Duró, Alessandra Crosato, Pablo Tassi. Numerical study on river bar response to spatial variations of channel width. Advances in Water Resources. 2016; 93 ():21-38.
Chicago/Turabian StyleGonzalo Duró; Alessandra Crosato; Pablo Tassi. 2016. "Numerical study on river bar response to spatial variations of channel width." Advances in Water Resources 93, no. : 21-38.
Annunziato Siviglia; Alessandra Crosato. Numerical modelling of river morphodynamics: Latest developments and remaining challenges. Advances in Water Resources 2016, 93, 1 -3.
AMA StyleAnnunziato Siviglia, Alessandra Crosato. Numerical modelling of river morphodynamics: Latest developments and remaining challenges. Advances in Water Resources. 2016; 93 ():1-3.
Chicago/Turabian StyleAnnunziato Siviglia; Alessandra Crosato. 2016. "Numerical modelling of river morphodynamics: Latest developments and remaining challenges." Advances in Water Resources 93, no. : 1-3.