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.

下午，与会代表实地参观考察了芷江抗战受降旧址、飞虎队纪念馆、妈祖庙、风雨桥等。

In the afternoon, the representatives visited the site where Japanese aggressors signed surrender agreement, the Flying Tiger Memorial Hall, Matsu Temple and Weathered Bridge.

土壤含水量随时间的变化，主要受降水量和土壤蒸发与植被蒸腾耗水的影响。

Precipitation, soil evaporation and plant transpiration were the primary factors affecting soil moisture which variation with time.