[1]XU Quanli,WANG Qing,HONG Liang,et al.Dynamic Simulation of Impervious Surface Expansion and Its Risk Assessment on Non-point Source Pollution in Dianchi Lake Basin[J].Research of Soil and Water Conservation,2021,28(04):186-192.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 04
Page number:
186-192
Column:
Public date:
2021-08-10
- Title:
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Dynamic Simulation of Impervious Surface Expansion and Its Risk Assessment on Non-point Source Pollution in Dianchi Lake Basin
- Author(s):
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XU Quanli1,2,3,4, WANG Qing1,2,3,4, HONG Liang1,2,3,4, YANG Kun1,2,3,4, PENG Shuangyun1,2,3,4, ZHANG Shaohua1,2,3,4
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(1.Department of Geography, Yunnan Normal University, Kunming 650500,China;2.GIS Technology Engineering Research Centre for West-China Resources and Environment, Ministry of Education,Yunnan Normal University, Kunming 650500,China;3.Yunnan Geospatial Information Technology Engineering Research Center, Kunming 650500,China;4.University Key Laboratory of Resources and Environment Remote Sensing in Yunnan, Kunming 650500,China)
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- Keywords:
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Dianchi Basin; impervious surface; partitioned cellular automata; hydrological response unit; non-point source pollution risk
- CLC:
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X2
- DOI:
-
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- Abstract:
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The rapid urbanization of lakeside cities not only results a massive expansion of impervious surface, but also makes a significant influence on water environment. It is an effective way to quantitatively explore the sustainable development of lakeside cities to simulate the spatiotemporal evolution pattern of impervious surface and its water environment effect by using hybrid models. Therefore, taking the Dianchi Lake Basin as the study area, we used remote sensing and GIS technology to analyze the temporal-spatial expansion characteristics of impervious surface from 2000 to 2016 caused by urbanization, and simulated and predicted the distribution of impervious surface in the future of 2021 and 2031 by using the partitioned cellular automata model. Then, the coverage of the impervious surface(ISC)from 2000 to 2031 was calculated on the sub-basin scale and the hydrological response units scale, as well as their temporal-spatial characteristics were analyzed. Finally, the historical and future non-point source pollution risk of Dianchi Lake Basin water environment was evaluated based on the relationship between ISC and water quality. The results show that:(1)the expansion of the impervious surface of the Dianchi Lake Basin is characterized by outward radiation from the Dianchi Lake; the impervious surface area has increased by 286.28 km2, the annual growth rate is 17.9 km2, and the fastest annual growth rate in 2006—2009 is 38.8 km2, its coverage increased from 10.16% in 2000 to 20.64% in 2016;(2)compared to non-partitioned CA model, the partitioned CA model can significantly improve the accuracy of land use changes simulation(where Kappa increases over 16%, and total accuracy increases over 26%), which can be used to simulate the expansion of the impervious surface in the future;(3)the impervious surface coverage both in sub-basins and hydrological response unit has been increasing year by year, and the risk of urban non-point source pollution also increases year by year; if attention does no be paid to the risk, the risk will be more severe in future. These research results can provide the scientific bases for adjusting land use structure and coordinating urban construction as well as water environment protection.