The characteristics of flood disaster evolution in the Weihe River valley are analyzed. 分析了渭河流域洪水灾害的环流形势演变特征。
County of Gansu Province is located in the southeast, in the northern city of Tianshui, a tributary of the Weihe River gourd. 秦安县位于甘肃省东南部，天水市北部，渭河支流葫芦河下游。
