城区降雨径流过程主要受降雨过程和下垫面变化的影响。
The process of runoff in urban area is mainly influenced by rainfall process and underlying surfaces variation.
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.
其次，在具有年周期的太阳辐射、垫面温度及凝结加热的作用下，基本气流以年周期变化。
The basic current has the annual variation under the influences of solar radiation, earth's surface temperature and condensation heatings, all with an annual period.
下垫面差异只起到加强或缓和气象要素日变化幅度的作用。
The difference between different underlying surfaces only helps increase or decrease the daily variation amplitude of the elements.
和平坦、均一、开阔下垫面不同的是谱的峰值频率向高频移动，且没有发现近地层具有的谱峰随高度的明显变化关系。
The heavily dependence of spectra or cospectra on height, which exists in flat, uniform, and open underlying surface, disappears in the complex terrains.
乌鲁木齐河流域的季节积雪受气温、降水量、水汽来向、山坡朝向、海拔和下垫面性质所控制和影响，具有明显的空间变化规律。
The seasonal snow cover in Urumqi River Basin varies temperally, influenced by air temperature, precipitation, moisture source, slope direction, elevation and ground surface condition.
河流输沙量的变化受流域降水和下垫面影响很大。
The variation of river sediment load is considerably affected by rainfall and underlying surface.
这主要是因为人类活动使流域下垫面发生了变化，对降雨特性变化的敏感性降低。
This is mainly because of human activities so that a change in basin surface, the changes in rainfall reduced susceptibility characteristics of generation and concentration.
这主要是因为人类活动使流域下垫面发生了变化，对降雨特性变化的敏感性降低。
This is mainly because of human activities so that a change in basin surface, the changes in rainfall reduced susceptibility characteristics of generation and concentration.
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