The effects of climate variability and land-use change on streamflow and nutrient loadings in the Sesan, Sekong, and Srepok (3S) River Basin of the Lower Mekong Basin

Khôi, Đào Nguyên; Loi, Pham Thi; Trang, Nguyễn Thị Thùy; Vuong, Nguyen Dinh Tuan; Fang, Shibo; Nhi, Pham Thi Thao

doi:10.1007/s11356-021-16235-w

Cited by 6 publications

(4 citation statements)

References 44 publications

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“…Khoi et al ( 2022 ) used the SWAT model to assess water quantity and quality (e.g. sediment, total nitrogen, and total phosphorus) responses to changes in different land use types; agricultural, bush, forestland, and urban areas.…”

Section: Introductionmentioning

confidence: 99%

Response of streamflow and nutrient loads in a small temperate catchment subject to land use change

Ayele,

Yu,

Bruere

et al. 2023

Environ Monit Assess

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The aim of this study was to quantify the effect of land use change (LUC) implemented to meet nutrient load targets for a freshwater lake in New Zealand. We used the Soil and Water Assessment Tool (SWAT) model in combination with a non-parametric statistical test to determine whether afforestation of 15% of a subcatchment area was adequate to meet assigned nutrient load targets. A regional management authority set nutrient load targets of reduction in total nitrogen (TN) by 0.9 t yr−1 and reduction in total phosphorus (TP) by 0.05 t yr−1 to avoid eutrophication in the receiving waters of a freshwater lake. The load reduction was designed to be achieved through 200 ha of LUC from pasture to trees. Analysis of nutrient loads before, during, and following LUC shows that a 15% increase in forest cover decreased the annual flow (7.2%), TP load (33.3%), and TN load (13.1%). As flow and water quality observations were discrete and at irregular intervals, we used a parametric test and the SWAT model as different lines of evidence to demonstrate the effect of afforestation on flow and water quality. Policymakers concerned with decisions about LUC to improve the quality of receiving waters can benefit from applying our findings and using a statistical and numerical modelling framework to evaluate the adequacy of land use change to support improvements in water quality.

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Section: Introductionmentioning

confidence: 99%

Response of streamflow and nutrient loads in a small temperate catchment subject to land use change

Ayele,

Yu,

Bruere

et al. 2023

Environ Monit Assess

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“…Pollutants are generated, transported, and transformed into uplands and waterbodies via physical mechanisms. Thus, strategies and approaches have been independently developed for their modeling: upland watershed model (UWSM) and downstream waterbody model (DWBM). , The model used to calculate pollutant load generation and simulate pollutant transport on uplands is named as UWSM, which includes the Soil and Water Assessment Tool (SWAT) − (), Storm Water Management Model (SWMM) () and Mike SHE (). Several models are used to simulate pollutant transport and transformation processes in downstream waterbodies, often known as DWBMs, e.g., the Hydrologic Engineering Center (HEC) , (), Environmental Fluid Dynamics Code (EFDC) , (), Mike 11, and Mike 21 ().…”

Section: Introductionmentioning

confidence: 99%

Watershed Models: Review of Approaches, Challenges, and Opportunities

Jiang,

Shen

2023

ACS EST Water

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Watershed modeling is a crucial tool needed for understanding, evaluating, and predicting the adverse impact of water pollution. The watershed model can be divided into an upland watershed model (UWSM) and a downstream waterbody model (DWBM). Neither a single UWSM nor DWBM are able to accurately simulate the pollutant transport along with the surface flow in complex upland watershed−waterbody systems. Therefore, coupled UWSM and DWBM are more desirable. This study categorized the coupled UWSM and DWBM into external and internal coupling models. The coupling mechanism, numerical accuracy, computational efficiency, and applications of these coupling models are discussed. A dynamic bidirectional coupled model for environment simulation (E-DBCM) is consistent with the natural flood and pollutant transport processes, which can improve computational efficiency while maintaining simulation accuracy. Compared with the original coupling models, it possesses three advantages: (1) reasonable coupling mechanisms, (2) complete function, and (3) high efficiency and simplicity. E-DBCM is a potential watershed water environment model, which can be widely used if improved further. The findings of this review will help accurately and efficiently predict and manage pollutants worldwide.

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“…Besides, in the future, land‐use change scenarios, yearly streamflow, and sediment load would increase by 0.19% to 0.45% and 0.22% to 0.68, respectively. [ 38 ]…”

Section: Introductionmentioning

confidence: 99%

Impacts of Land‐Use Change on the Hydrology of Lake Tana Basin, Upper Blue Nile River Basin, Ethiopia

Getachew

Manjunatha

2022

Global Challenges

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Human activities impact hydrology through changes in land use and land cover. This study examins the effects of changing land use on hydrological processes using the soil and water assessment tool (SWAT) model. The data is acquired from Landsat 4‐5 Thematic Mapper (TM) in 1989, Landsat 7 Enhanced Thematic Mapper Plus (ETM+) in 2005, and Landsat 8 Operational Land Inventory (OLI) in 2019. Image preprocessing, which includes georeferencing, radiometric and atmospheric correction, image enhancement, band composite, mosaicking, and sub‐setting, are performed. After that, supervised classification, accuracy assessment, and change detection are carried out. The hydrological changes in 1989, 2005, and 2019 are analyzed using land‐use maps. The SWAT model's calibration, validation, and sensitivity analysis are performed using the Integrated Parameter Estimation and Uncertainty Analysis Tool in the four main rivers of the basin. Farmlands and built‐up lands are found to have steadily increased in the basin, while shrublands, grasslands, and bare lands declined. Due to an expansion of agricultural and built‐up lands and a decrease in shrublands and grasslands, the basin's mean annual water yield and surface runoff increased in 2019, while evapotranspiration and lateral flow decreased compared to 1989 and 2005. Therefore, future watershed and basin management shall consider changing land use.

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The effects of climate variability and land-use change on streamflow and nutrient loadings in the Sesan, Sekong, and Srepok (3S) River Basin of the Lower Mekong Basin

Cited by 6 publications

References 44 publications

Response of streamflow and nutrient loads in a small temperate catchment subject to land use change

Response of streamflow and nutrient loads in a small temperate catchment subject to land use change

Watershed Models: Review of Approaches, Challenges, and Opportunities

Impacts of Land‐Use Change on the Hydrology of Lake Tana Basin, Upper Blue Nile River Basin, Ethiopia

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