这种变化特征主要与控制小区地形、土地利用、地表径流和水系特征有关。
These change characteristics were related mainly to the topography, land use, surface run-off and drainage characteristics of the controlled areas.
流域地形是决定水系生成的一个关键性因素，是数字流域和分布式水文模型研究的主要内容。
The watershed topography is a key factor for extraction of the drainage, and it is also a very important topic in the study of digital watershed and the distributed hydrological models.
根据地形和水利工程现状，通过水动力学的分析和计算，将旧水库改建为给水系统的混凝沉淀设施。
After water dynamics analysing and calculating, an old water reservior is rebuilt into a precipitating equipment combining with the terrain and the present condition of water project.
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