Author(s): Han Xue; Takahiro Sayama; Kaoru Takara; Bin He; Guangwei Huang; Weili Duan
Linked Author(s):
Keywords: No Keywords
Abstract: In order to take quantitative estimation of long-term urbanization impacts on non-point source (NPS) pollution export, this study demonstrates a recently developed simple but physically reasonable NPS pollution estimation method, based on distributed hydrological modeling and a spatial hydrograph-separation technique, which can reflect the spatial distribution, hydrological features and water quality measurements from source areas in different land-uses. This method was applied at the Pingqiao River Basin (22.3 km), a tributary of the Taihu Basin (36,895 km) in China for three urbanization scenarios (2015,2020,2030) by considering both the effects of land-use change and population change. The year-long simulation of 2015 suggested satisfactory agreement with the observations (Relative Error of the Total Nitrogen (TN) concentration in-stream: 19.6%, in summer) and 57,890 kg of annual TN export. From 2015 to 2020 and 2030, the annual urban TN export increased 26.1% and 54.6%, respectively, which is caused by the increased urban runoff (25.6% and 54.0%) and urban population (26.9%, 55.9%). Although the increased urban area accounted for 2.42% and 4.48% of the total study area in2020 and 2030, the annual total TN export increased 6.1% and 11.4%, respectively, indicating the innegligible urbanization impacts on NPS pollution export.
Year: 2018