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Online registration for admission in PG till 24 august merit will be issued on 25 august

Online registration for admission in PG till 24 august merit will be issued on 25 august
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蓝色、黄色、橙色、红色…… 汛期灾害预警如何产生?


  省国土空间生态修复与地质灾害防治研究院预警预报室主任屈伯强介绍,四川已开展地灾与气象风险研究10余年,初步掌握不同类型、不同规模地灾形成条件的基础数据。在将全省按照5公里乘以5公里的标准划分成若干个网格后,四川构建了以地形地貌、地质构造、地层岩性、坡度等因素作为背景值的预警模型。
  洪水预警不遑多让。谢学成介绍,上世纪50年代起,四川陆续在各江河设置各类水文站监测点数千个,初步摸清了各江河、山洪沟的成灾标准。最终,构建了包含各流域集水面积大小、降雨强度、既有江河底水等为背景的预警模型。
  隐性预报法的思路,是依托历史成灾规律与标准,仅考虑降水参数建立模型,推算出区域内的成灾风险和烈度。简单来说,就是把降雨数量和风险登记等级一一对应,比如50毫米降水为黄色� ....

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