Simulation of nitrogen and phosphorus loads in the Dongjiang River basin in South China using SWAT |
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| Authors: | Yiping Wu and Ji Chen |
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| Institution: | (1) Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China |
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| Abstract: | Population growth, urbanization, and intensified agriculture have resulted in mobilization of nitrogen and phosphorus, which
is the main cause of river water quality deterioration. Environmental regulation has expedited the necessity for agricultural
producers to design and implement more environmentally suitable practices. Therefore, there is a need to identify critical
nutrients and their loss/transport potential. Watershed model can be used to better understand the relationship between land
use activities/management and hydrologic processes/water quality changes that occur within a watershed. The objective of the
study is to test the performance of the SWAT model and the feasibility of using this model as a simulator of water flow and
nitrogen and phosphorus yields over the Dongjiang River basin in South China.
Spatial data layers of land slope, soil type, and land use were combined with geographic information system (GIS) to aid in
creating model inputs. The observed streamflow and sediment at Boluo station in the Dongjiang River basin were used to calibrate
and validate the model. Time series plots and statistical measures were used to verify model predictions. Predicted values
generally matched well with the observed values during calibration and validation (R
2≥0.6 and Nash-Suttcliffe Efficiency ≥0.5) except for underestimation of sediment peaks and overestimation of sediment valleys
at Boluo. This study shows that SWAT is able to predict streamflow, sediment generation, and nutrients transport with satisfactory
results. |
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| Keywords: | SWAT nitrogen and phosphorus transport water quality Dongjiang River |
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