This page has only limited features, please log in for full access.

Unclaimed
Hong Hanh Nguyen
Department of Ecohydrology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany

Basic Info

Basic Info is private.

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Research in environmental planning and management
Published: 26 January 2021 in Environmental Science and Pollution Research
Reads 0
Downloads 0

A growing literature indicates that untreated wastewater from leaky sewers stands among major sources of pollution to water resources of urban systems. Despite that, the quantification and allocation of sewer exfiltration are often restricted to major pipe areas where inspection data are available. In large-scale urban models, the emission from sewer exfiltration is either neglected (particularly from private sewers) or represented by simplified fixed values, and as such its contribution to the overall urban emission remains questionable. This study proposes an extended model framework which incorporates sewer exfiltration pathway in the catchment model for a better justified pollution control and management of urban systems at a nationwide scale. Nutrient emission from urban areas is quantified by means of the Modelling of Nutrient Emissions in River Systems (MONERIS) model. Exfiltration is estimated for public and private sewers of different age groups in Germany using the verified methods at local to city scales, upscaling techniques, and expert knowledge. Results of this study suggest that the average exfiltration rate is likely to be less than 0.01 L/s per km, corresponding to approximately 1 mm/m/year of wastewater discharge to groundwater. Considering the source and age factors, the highest rate of exfiltration is defined in regions with significant proportions of public sewers older than 40 years. In regions where public sewers are mostly built after 1981, the leakage from private sewers can be up two times higher than such from public sewers. Overall, sewer exfiltration accounts for 9.8% and 17.2% of nitrate and phosphate loads from urban systems emitted to the environment, which increases to 11.2% and 19.5% in the case of no remediation scenario of projected defective sewer increases due to ageing effects. Our results provide a first harmonized quantification of potential leakage losses in urban wastewater systems at the nationwide scale and reveal the importance of rehabilitation planning of ageing sewer pipes in public and private sewer systems. The proposed model framework, which incorporates important factors for urban sewer managers, will allow further targeting the important data need for validating the approach at the regional and local scales in order to support better strategies for the long-term nutrient pollution control of large urban wastewater systems.

ACS Style

Hong Hanh Nguyen; Markus Venohr. Harmonized assessment of nutrient pollution from urban systems including losses from sewer exfiltration: a case study in Germany. Environmental Science and Pollution Research 2021, 1 -16.

AMA Style

Hong Hanh Nguyen, Markus Venohr. Harmonized assessment of nutrient pollution from urban systems including losses from sewer exfiltration: a case study in Germany. Environmental Science and Pollution Research. 2021; ():1-16.

Chicago/Turabian Style

Hong Hanh Nguyen; Markus Venohr. 2021. "Harmonized assessment of nutrient pollution from urban systems including losses from sewer exfiltration: a case study in Germany." Environmental Science and Pollution Research , no. : 1-16.

Journal article
Published: 22 January 2019 in Science of The Total Environment
Reads 0
Downloads 0

Quantifying the water quantity and quality variations resulting from human induced activities is important for policy makers in view of increasing water scarcity and water pollution. Simple models can be robust tools in estimating the runoff from catchments, but do they also sufficiently reflect complex physio-chemical processes required for spatially-explicit simulation of soil-water interactions, and the resulting pollutant responses in catchments? Do these models respond sensitive to the impacts of different land use change representations? These questions are considered by applying the semi-distributed process-based catchment models SWAT and SOURCE to the Sixth Creek catchment in South Australia. Both models used similar data whereas inputs for SOURCE were generated from land-use based Functional Units (FUs), while FUs for SWAT were based on land use, soil and slope combinations. After satisfying calibration of both models for the outlet station of the catchment, the simulated flow by SOURCE produced high goodness of fit metrics, while nutrient loads simulated by SWAT were more realistic. Both models benefitted from using locally available Potential Evapotranspiration data for calibrating the hydrology. Scenarios of intensified land uses by two models showed more credible results for sediment and nutrient loads with the static approach when simulating the linear rather than the non-linear land use changes. The study has shown that informing decisions on the hydrology at catchment scale is well suited to less-complex models, whereas decisions on impact of land use change on water quality in catchments are better suited by models with process descriptions for soil-water interactions.

ACS Style

Hong Hanh Nguyen; Friedrich Recknagel; Wayne Meyer; Jacqueline Frizenschaf; He Ying; Matthew S. Gibbs. Comparison of the alternative models SOURCE and SWAT for predicting catchment streamflow, sediment and nutrient loads under the effect of land use changes. Science of The Total Environment 2019, 662, 254 -265.

AMA Style

Hong Hanh Nguyen, Friedrich Recknagel, Wayne Meyer, Jacqueline Frizenschaf, He Ying, Matthew S. Gibbs. Comparison of the alternative models SOURCE and SWAT for predicting catchment streamflow, sediment and nutrient loads under the effect of land use changes. Science of The Total Environment. 2019; 662 ():254-265.

Chicago/Turabian Style

Hong Hanh Nguyen; Friedrich Recknagel; Wayne Meyer; Jacqueline Frizenschaf; He Ying; Matthew S. Gibbs. 2019. "Comparison of the alternative models SOURCE and SWAT for predicting catchment streamflow, sediment and nutrient loads under the effect of land use changes." Science of The Total Environment 662, no. : 254-265.

Journal article
Published: 13 December 2018 in Water
Reads 0
Downloads 0

Urbanization poses a challenge to sustainable catchment management worldwide. This study compares streamflows and nutrient loads in the urbanized Torrens catchment in South Australia at present and future urbanization levels, and addresses possible mitigation of urbanization effects by means of the control measures: river bank stabilization, buffer strip expansion, and wetland construction. A scenario analysis by means of the Soil and Water Assessment Tool (SWAT) based on the anticipated urban population density growth in the Torrens catchment over the next 30 years predicted a remarkable increase of streamflow and Total Phosphorous loads but decreased Total Nitrogen loads. In contrast, minor changes of model outputs were predicted under the present urbanization scenario, i.e. urban area expansion on the grassland. Scenarios of three feasible control measures demonstrated best results for expanding buffer zone to sustain stream water quality. The construction of wetlands along the Torrens River resulted in the reduction of catchment runoff, but only slight decreases in TN and TP loads. Overall, the results of this study suggested that combining the three best management practices by the adaptive development of buffer zones, wetlands and stabilized river banks might help to control efficiently the increased run-off and TP loads by the projected urbanization of the River Torrens catchment.

ACS Style

Hong Hanh Nguyen; Friedrich Recknagel; Wayne Meyer. Water Quality Control Options in Response to Catchment Urbanization: A Scenario Analysis by SWAT. Water 2018, 10, 1846 .

AMA Style

Hong Hanh Nguyen, Friedrich Recknagel, Wayne Meyer. Water Quality Control Options in Response to Catchment Urbanization: A Scenario Analysis by SWAT. Water. 2018; 10 (12):1846.

Chicago/Turabian Style

Hong Hanh Nguyen; Friedrich Recknagel; Wayne Meyer. 2018. "Water Quality Control Options in Response to Catchment Urbanization: A Scenario Analysis by SWAT." Water 10, no. 12: 1846.

Journal article
Published: 08 October 2018 in Ecohydrology & Hydrobiology
Reads 0
Downloads 0

Water-dependent ecosystems are highly vulnerable to climate change and human-induced alterations. This is especially true for ecosystems of urban catchments where aquatic habitats are already being degraded. This study examines prospective impacts of future climate change and anticipated urbanization on water quantity and quality in the urbanized Torrens catchment, South Australia. The eco-hydrological model SWAT has been applied to simulate flow, total nitrogen (TN) and total phosphorous (TP) for the following scenarios: (1) Scenarios based on future precipitation and temperature patterns for the period from 2021 to 2050, by means of two representative pathways (RCPs) of six downscaled global circulation models. (2) A scenario on the hypothetical urbanization of the Torrens catchment over the next 30 years, based on the projected population growth in the region. Scenario (1) suggests there will be a declining monthly flow due to increased temperature and decreased precipitation, and consequently reduced TN and TP loads. In contrast, scenario (2) predicts a higher monthly flow and TP loads resulting from extended impermeable areas due to urbanization, but lower TN loads due to the shrinking grassland taken over by urban land use. The combination of both scenarios shows the offset of their effects on the flow and TP loads, along with decreasing TN loads. The results of this study suggest that, in the long term, urbanization is of greater concern for the Torrens catchment than future climate change. Management decisions have to take into account the enhanced vulnerability of urban ecosystems under future local and global changes.

ACS Style

Hong Hanh Nguyen; Friedrich Recknagel; Wayne Meyer. Effects of projected urbanization and climate change on flow and nutrient loads of a Mediterranean catchment in South Australia. Ecohydrology & Hydrobiology 2018, 19, 279 -288.

AMA Style

Hong Hanh Nguyen, Friedrich Recknagel, Wayne Meyer. Effects of projected urbanization and climate change on flow and nutrient loads of a Mediterranean catchment in South Australia. Ecohydrology & Hydrobiology. 2018; 19 (2):279-288.

Chicago/Turabian Style

Hong Hanh Nguyen; Friedrich Recknagel; Wayne Meyer. 2018. "Effects of projected urbanization and climate change on flow and nutrient loads of a Mediterranean catchment in South Australia." Ecohydrology & Hydrobiology 19, no. 2: 279-288.

Journal article
Published: 01 November 2017 in Journal of Environmental Management
Reads 0
Downloads 0

Sustainable management of drinking water reservoirs requires taking into account the potential effects of their catchments' development. This study is an attempt to estimate the daily patterns of nutrients transport in the catchment - reservoir systems through the application of the ensemble of complementary models SWAT-SALMO. SWAT quantifies flow, nitrate and phosphate loadings originating in catchments before entering downstream reservoirs meanwhile SALMO determines phosphate, nitrate, and chlorophyll-a concentrations within the reservoirs. The study applies to the semi-arid Millbrook catchment-reservoir system that supplies drinking water to north-eastern suburbs of Adelaide, South Australia. The catchment hosts viti- and horticultural land uses. The warm-monomictic, mesotrophic reservoir is artificially aerated in summer. After validating the simulation results for both Millbrook catchment and reservoir, a comprehensive scenario analysis has been conducted to reveal cascading effects of altered management practices, land uses and climate conditions on water quality in the reservoir. Results suggest that the effect on reservoir condition in summer would be severe, most likely resulting in chlorophyll-a concentrations of greater than 40 μg/l if the artificial destratification was not applied from early summer. A 50% curbing of water diversion from an external pipeline to the catchment will slightly limit chlorophyll-a concentrations by 1.22% as an effect of reduced inflow phosphate loads. The simulation of prospective land use scenarios converting 50% of present pasture in the Millbrook catchment into residential and orchards areas indicates an increase of summer chlorophyll-a concentrations by 9.5-107.9%, respectively in the reservoir. Global warming scenarios based on the high emission simulated by SWAT-SALMO did result in earlier growth of chlorophyll-a but overall the effects on water quality in the Millbrook reservoir was not significant. However scenarios combining global warming and land use changes resulted in significant eutrophication effects in the reservoir, especially in the unmanaged condition with stratification in summer. This study has demonstrated that complementary model ensembles like SWAT-SALMO allow to comprehend more realistically cascading effects of distinct catchment processes on internal reservoir's processes, and facilitate integrated management scenarios.

ACS Style

Hong Hanh Nguyen; Friedrich Recknagel; Wayne Meyer; Jacqueline Frizenschaf; Manoj Kumar Shrestha. Modelling the impacts of altered management practices, land use and climate changes on the water quality of the Millbrook catchment-reservoir system in South Australia. Journal of Environmental Management 2017, 202, 1 -11.

AMA Style

Hong Hanh Nguyen, Friedrich Recknagel, Wayne Meyer, Jacqueline Frizenschaf, Manoj Kumar Shrestha. Modelling the impacts of altered management practices, land use and climate changes on the water quality of the Millbrook catchment-reservoir system in South Australia. Journal of Environmental Management. 2017; 202 ():1-11.

Chicago/Turabian Style

Hong Hanh Nguyen; Friedrich Recknagel; Wayne Meyer; Jacqueline Frizenschaf; Manoj Kumar Shrestha. 2017. "Modelling the impacts of altered management practices, land use and climate changes on the water quality of the Millbrook catchment-reservoir system in South Australia." Journal of Environmental Management 202, no. : 1-11.

Book chapter
Published: 23 September 2017 in Ecological Informatics
Reads 0
Downloads 0
ACS Style

Friedrich Recknagel; George Arhonditsis; Dong-Kyun Kim; Hong Hanh Nguyen; William K. Michener. Strategic Forecasting in Ecology by Inferential and Process-Based Models. Ecological Informatics 2017, 341 -372.

AMA Style

Friedrich Recknagel, George Arhonditsis, Dong-Kyun Kim, Hong Hanh Nguyen, William K. Michener. Strategic Forecasting in Ecology by Inferential and Process-Based Models. Ecological Informatics. 2017; ():341-372.

Chicago/Turabian Style

Friedrich Recknagel; George Arhonditsis; Dong-Kyun Kim; Hong Hanh Nguyen; William K. Michener. 2017. "Strategic Forecasting in Ecology by Inferential and Process-Based Models." Ecological Informatics , no. : 341-372.

Journal article
Published: 07 January 2017 in Water
Reads 0
Downloads 0

To assist water resource managers with future land use planning efforts, the eco-hydrological model Soil and Water Assessment Tool (SWAT) was applied to three catchments in South Australia that experience extreme low flow conditions. Particular land uses and management issues of interest included forest covers, known to affect water yields, and farm dams, known to intercept and change the hydrological dynamics in a catchment. The study achieved a satisfactory daily calibration when irrigation farm dams were incorporated in the model. For the catchment dominated by extreme low flows, a better daily simulation across a range of qualitative and quantitative metrics was gained using the base-flow static threshold optimization technique. Scenario analysis on effects of forest cover indicated an increase of surface flow and a reduction of base-flow when native eucalyptus lands were replaced by pastures and vice versa. A decreasing trend was observed for the overall water yield of catchments with more forest plantation due to the higher evapotranspiration (ET) rate and the decline in surface flow. With regards to effects of irrigation farm dams, assessment on a daily time step suggested that a significant volume of water is stored in these systems with the water loss rate highest in June and July. On an annual basis, the model indicated that approximately 13.1% to 22.0% of water has been captured by farm dams for irrigation. However, the scenario analysis revealed that the purposes of use of farm dams rather than their volumetric capacities in the catchment determined the magnitude of effects on streamflows. Water extracted from farm dams for irrigation of orchards and vineyards are more likely to diminish streamflows than other land uses. Outputs from this study suggest that the water use restrictions from farm dams during recent drought periods were an effective tool to minimize impacts on streamflows.

ACS Style

Hong Hanh Nguyen; Friedrich Recknagel; Wayne Meyer; Jacqueline Frizenschaf. Analysing the Effects of Forest Cover and Irrigation Farm Dams on Streamflows of Water-Scarce Catchments in South Australia through the SWAT Model. Water 2017, 9, 33 .

AMA Style

Hong Hanh Nguyen, Friedrich Recknagel, Wayne Meyer, Jacqueline Frizenschaf. Analysing the Effects of Forest Cover and Irrigation Farm Dams on Streamflows of Water-Scarce Catchments in South Australia through the SWAT Model. Water. 2017; 9 (1):33.

Chicago/Turabian Style

Hong Hanh Nguyen; Friedrich Recknagel; Wayne Meyer; Jacqueline Frizenschaf. 2017. "Analysing the Effects of Forest Cover and Irrigation Farm Dams on Streamflows of Water-Scarce Catchments in South Australia through the SWAT Model." Water 9, no. 1: 33.