20 洪涝灾害的应急处置
洪涝灾害的应急处置由于长时间、大面积降雨或者冰雪融化以及江河湖泊堤坝溃决等原因,致使单位时间内单位截面上的水流流量突然增大,超出水道的天然或人工限制界限的异常高水位水流,称之为洪水,而由此造成的灾害叫洪涝灾害。一、洪涝灾害的特点及危害(一)洪涝灾害的类型造成洪涝灾害的主要原因就是洪水。洪水可分为河流洪水、湖泊洪水和风暴潮洪水等。其中河流洪水依照成因的不同,又可分为以下几种类型1.暴雨洪水这是最常见、威胁最大的洪水,是由较大强度的降雨形成的,简称雨洪。2.山岳洪水系指山区溪沟中发生的暴涨暴落的洪水。3.融雪洪水主要发生在高纬度积雪地区或高山积雪地区。4.冰凌洪水主要发生在黄河、松花江等北方江河上...
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