Estimation and assessment of baseflow at an ungauged watershed according to landuse change

Lee, Ji Min; Shin, Yongchun; Park, Youn Shik; Kum, Donghyuk; Lim, Kyoung Jae; Lee, Seung Oh; Kim, Hung-Soo; Jung, Younghun

doi:10.17663/jwr.2014.16.4.303

Cited by 3 publications

(3 citation statements)

References 46 publications

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“…Climate change variability has recently increased, exacerbated by industrialization, urban population concentration, and rapid urban expansion [1][2][3][4][5]. Furthermore, distortions in the water cycle and pollution discharge rates in regions affected by heavy rainfall have sharply increased [6].…”

Section: Introductionmentioning

confidence: 99%

Analyzing Priority Management for Water Quality Improvement Strategies with Regional Characteristics

Lee,

Park,

Choi

et al. 2024

Water

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As the management areas for NPS pollution continue to increase, it is essential to conduct a situation analysis considering the regional characteristics and the scope of pollution reduction. In this study, the focus is on differentiating regional (urban, agricultural) characteristics to enhance water quality and reduce pollution loads in the increasing management areas for NPSs. Furthermore, priority management areas are identified based on urgency and vulnerability, and management strategies are proposed. The assessment involved evaluating both streamflow and water quality (T-P) using long-term monitoring data and watershed models (SWAT and HSPF) that take into account regional characteristics. The results indicated notable regional improvements, with T-P pollution reductions ranging from 20.7% to 26.8% and T-P concentration reductions ranging from 16.4% to 24.7% compared to baseline conditions in unmanaged areas. Based on these research findings, it is anticipated that the efficient and effective management of NPS pollution can be implemented on a regional basis. Moreover, the results of this study will not only contribute to the establishment of pollution standards, but also significantly impact the evaluation and proposal of management objectives, thereby making a substantial contribution to national water quality policies.

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Section: Introductionmentioning

confidence: 99%

Analyzing Priority Management for Water Quality Improvement Strategies with Regional Characteristics

Lee,

Park,

Choi

et al. 2024

Water

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“…The variations in climate and land use directly impact surface runoff and baseflow, causing events of droughts and floods that impact the sustainability of these resources and the social ecosystem. Several studies have examined alterations in streamflow due to changes in temperature and precipitation, land use change, and urbanization [6][7][8]. Land use change (e.g., urbanization), in particular, affects the hydrologic components such as infiltration and evaporation, and consequently, affects other components related to the hydrologic cycle [9,10].…”

Section: Introductionmentioning

confidence: 99%

Integrated Assessment of the Land Use Change and Climate Change Impact on Baseflow by Using Hydrologic Model

et al. 2023

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Changes in land use and climate can affect both the surface runoff and baseflow of streamflow. Baseflow significantly contributes to stream function in regions where climatic characteristics are seasonally distinct. Baseflow estimation depends on the observed streamflow in gauge water sheds, but baseflow estimations in data-poor or gauged watersheds depend solely on streamflow predicted from the hydrologic model. To accurately predict base runoff through the model, it is necessary to apply proper hydrological parameters. Accordingly, the objectives of this study are to (1) improve predictions of SWAT by applying the alpha factor estimated using BFLOW for calibration, and (2) evaluate streamflow and baseflow the effects of changes in land use and climate. The results show the alpha factor estimated using BFLOW in SWAT calibration improves the prediction for streamflow and recessions in the baseflow. In this study, streamflow increased due to land use change (impervious urban and agricultural areas), while baseflow decreased. The baseflow was more significant in the dry season than in the wet season, and the baseflow fluctuation was significant from February to May. Moreover, the changes in land use in the study area lead to differences in the seasonal characteristics observed for the temporal distribution of streamflow and baseflow.

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“…An increase in surface flow will reduce groundwater recharge. In changing the cultivation of agricultural land to vegetated grassland or forest, there is some possibility of reducing the frequency of flooding, but not necessarily the duration [23].…”

Section: Introductionmentioning

confidence: 99%

Study of Non-Point Pollution in the Ashe River Basin Based on SWAT Model with Different Land Use

Chen

Nie

et al. 2022

Water

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The Ashe River Basin (ARB), long known as the “Golden Waterway” in Manchu, has become one of China’s most polluted rivers. The basin area of the Ashe River is 3545 km2 and the total length of the river is 257 km. There have not been specific studies on land use change and non-point pollution in the ARB region. This paper uses the ARB watershed as the study area, simulates the watershed using the SWAT (Soil and Water Assessment Tool) model, and analyzes the hydrological processes and the temporal and spatial changes of total nitrogen and total phosphorus in the watershed with hydrology and water quality as the objectives under different periods of land use to reduce pollution in the watershed and protect the environment. The results show that the simulation of runoff, and even theR2 and NS(both the coefficient of determination and the Nash–Sutcliffe efficiency coefficient are simulated by SWAT-CUP, which is generally used to validate the simulation results of the hydrological model, where the closer the result is to 1, the better the effect) of total nitrogen and total phosphorus in the watershed, are also all above 0.75 and have good applicability during regular and validation periods. Since 2000, the simulated monthly average total nitrogen and total phosphorus levels have progressively grown. The most polluted areas are concentrated in the middle and lower reaches of the watershed near the main streams owing to the rise in load per unit area caused by the collection of pollutants from the upper watershed to the watershed outlet, and even an increase in fertilizer application due to the larger area of cultivated land.

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Estimation and assessment of baseflow at an ungauged watershed according to landuse change

Cited by 3 publications

References 46 publications

Analyzing Priority Management for Water Quality Improvement Strategies with Regional Characteristics

Analyzing Priority Management for Water Quality Improvement Strategies with Regional Characteristics

Integrated Assessment of the Land Use Change and Climate Change Impact on Baseflow by Using Hydrologic Model

Study of Non-Point Pollution in the Ashe River Basin Based on SWAT Model with Different Land Use

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