The process and characteristics of its river pattern change depend on its unique geologic environment. The hydrologic condition, as a dynamic factor is also restricted by geologic environment.
下荆江河势演变过程及特点是因其所处的特殊地质环境决定的，作为动力因素的水文条件也受地质环境的制约。
On the base of having surveyed a lot of karst basins, collected the hydrologic date and analysed the physical process of runoff generating , a hydrologic model was presented in this paper.
在大量岩溶流域查勘及水文资料收集的基础上，分析了岩溶流域径流形成的物理过程，提出了相应的水文模型。
Infiltration is an important process in hydrologic cycle, in the source region of Yangtze River, infiltration of soil moisture has impact in runoff and plateau ecology.
入渗是水文循环过程中一个重要环节，在长江源区，土壤水分入渗对径流的影响很大，也是高原生态系统重要的影响因素。
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