在此基础上，提出了分析控制性和非控制性下垫面因素共同作用下对洪水影响的基本思路，并建立了综合计算模型。
Then, a fundamental suggestion for estimation of impacts of both control factors and non-control factors on floods is presented and a comprehensive model for this estimation is developed.
水文下垫面分析是水文分析计算、水文测验、水文预报、水资源评价等的基础性工作。
Hydrologic underlying surface analysis are the basic study in hydrologic analysis, hydrologic observation, hydrologic forecast and water resources assessment.
本文就是在前人研究的基础上，利用了3s技术，从空间角度分析了城市扩展导致下垫面变化，从而引起地下水补给量的减少。
This paper is based on the investigation of the fore people, makes use of 3s technologies, analyzes the bottom mat changed from the city expansion, which causes the fall of groundwater level.
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