前两者只是西溪流域洪水产生的背景条件，而后者则是洪水频繁、灾情加重的主要原因。
The former two are only background conditions of producing flood, and the latter is primary factor of flood frequently and making disaster more serious.
对西苕溪流域的土壤样品及部分太湖近岸表层底泥样品，进行了环境磁学测试与化学分析。
Soil samples in the Tiaoxi Catchment, mostly in West Tiaoxi Catchment, as well as some sediments in Taihu Lake, were collected and analyzed with magnetic properties and heavy metal concentrations.
为了定量研究西苕溪流域洪水发生机制和动态规律，本项目研制了一个局地尺度综合水文模型。
A local scale integrated hydrological model has been developed for the studies of flood mechanisms and dynamics in this area.
为了定量研究西苕溪流域洪水发生机制和动态规律，本项目研制了一个局地尺度综合水文模型。
A local scale integrated hydrological model has been developed for the studies of flood mechanisms and dynamics in this area.
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