近30年来，快速城市化背景下不透水表面（ISA）导致的生态环境变化已经成为当前城市生态环境研究的热点问题，而ISA的水土流失效应是其中的重要方向之一。滇池流域城市化过程中ISA带来的城市非点源污染已经成为滇池水质恶化的主要原因之一，而水土流失是非点源污染物的主要载体和重要途径。因此急需研究ISA对水土流失的作用机制，从而缓解流域快速城市化与日趋严重的城市非点源污染之间的矛盾。为此，本研究基于流域尺度，以滇池流域为研究对象，以“格局—过程—效应”为理论框架，从ISA空间格局及过程演变出发，基于ISA的形状、大小、数量、分布及空间组合、关联等特征构建可量化的ISA格局指数和ISA变化的产流模型、产沙模型，从数量和空间两个变化维度以动态的观点探索ISA与水土流失之间的相互联系与作用机制，揭示ISA变化下的水土流失形成过程与响应模式，为区域可持续发展提供理论依据和科学指导。

The past 30 years, the ecological environmental change impacted by impervious surface area(ISA) is a hot topic to urban ecological environmental change. In this area, soil erosion effects of ISA are an important field. Urban non-point source pollution which be produced by ISA has become one of the main reasons for the deterioration of water quality of Dianchi Lake. Soil erosion is the key carrier and way of non-point source pollutants. So, it is very necessary to research the soil erosion mechanism of ISA. Its purpose is to ease the contradiction between rapid urbanization and growing urban watershed non-point source pollution. Therefore, in this research proposal, taking the “pattern-process-effect” as theoretical framework, we study the shape, size, quantity, distribution and spatial combination, association and other features of ISA and build quantifiable ISA pattern index in Dianchi Lake Basin, rebuild the runoff yield model and sediment yield model by taking ISA as the main factors, explore the interrelationship and mechanism of ISA and soil erosion based on the view of dynamic changes from two dimensions which are number and space, reveal the formation process and response mode of soil erosion with the ISA change. Through those researches above all, it is hopeful to provide the scientific theoretical supports and scientific guidance for regional sustainable development.