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1暴雨分析1.1持续性强降水的成因分析受特殊地理位置和大气环流影响,初秋持续性降水是渭河流域多发的天气现象之一,而像2011年持续时间长,暴雨范围大的持续性降水却比较少见,其发生发展是与大气环流异常有密切关系。2011年9月5日第一次强降水和洪峰发生时,500hPa欧亚中高纬度环流形势为两脊一槽型(图1a),贝加尔湖到巴尔喀什湖为一长波槽,西太平洋副热带
1 Analysis of heavy rains 1.1 Analysis of the causes of persistent heavy rainfall Due to the special geographical position and atmospheric circulation, persistent precipitation in early autumn is one of the frequent weather phenomena in the Weihe River Basin. However, as in 2011, persistent rainfall with large rainfall range It is relatively rare that its occurrence and development are closely related to the abnormal atmospheric circulation. At the first 500 hPa of heavy rainfall and flood peak on September 5, 2011, the circulation at 500hPa in middle and high latitudes of Europe and Asia is a ridge with two ridges and one groove (Figure 1a). The Baikal Lake to the Lake Balkhash is a long-wave trough, and the western Pacific subtropical