复合型泥沙灾害过程特征及区域划分

本文给出了复合型泥沙灾害的定义,从时间序列角度出发,表述了复合型泥沙灾害过程的复杂性、周期性、耦合性及层次性等特征,并对泥沙灾害的区域关联性与区域差异,区域划分与分区特征作了研究。根据复合泥沙灾害过程发育的大环境及基本复合过程进行划分,分为东部平原-沿海地带复合泥沙灾害过程地区、中部高平原低山复合泥沙灾害过程地区、西北干旱高中山盆地复合泥沙灾害过程地区、青藏高寒山原复合泥沙灾害过程地区4个一级区;依据泥沙灾害复合过程的相似性及差异性,划分11个复合泥沙灾害过程二级亚区。

A Study on Process Character and Zoning of Composite Sediment Disasters

In this paper the composite sediment disaster process is def ined as a compound of sediment disasters, which are formed under a given natural condit ion and by human activities in a certain space and time span and are with inhere ntly interrelated Generally speaking, it can be divided into two main types ba sed on its forming dynamics One is naturally carried out and the other is huma n induced From time series viewpoint, it is explained that the composite sedim ent disaster has complexity, periodicity, anatomists and administrative levels The regional characteristics of composite sediment disaster process have also been studied They are relatives, differences and dividing characters Based o n principle environmental features and basic composite processes the whole country can be divided into 4 main regions of composite sediment disasters They are ( Ⅰ) the eastern China plain and coast zone, (Ⅱ) the middle China plateau and lo wer mountainous area, (Ⅲ) the north～western China arid high and middle mountai nous and huge basin area, and (Ⅳ) the Qinghai Xizang Plateau and highest mount ainous area According to composite sediment similarities and differences the 1 1 sub regions has been divided as follows, Ⅰ1 Sub region of flood type of co mposite sediment disasters in the north eastern China,Ⅰ2 Sub region of floo d type of composite sediment disasters in the northern China and lower and middl e Yangtze River plain,Ⅰ3 Sub region of flood storm tide type of composite s ediment disasters along coast in the south eastern China;Ⅱ1 Sub region of a rid water soil lose type of composite sediment disasters on Loess Plateau, Ⅱ 2 Sub region of flood slide debris flow type of composite sediment disasters of Sichuan, Guizhou, west Hunan and Hubei, Ⅱ3 Sub region of slide debris fl ow type of composite sediment disasters of west Sichuan and Yunnan; Ⅲ1 Sub r egion of composite sediment disasters in Inner Mongolia, Ⅲ2 Sub region of wi ndy sand type of composite sediment disasters in Xinjiang and Gansu, Ⅲ3 Sub region of slide debris flow type of composite sediment disasters in Tianshan mountain;Ⅳ1 Sub region of slide debris flow type of composite sediment disa sters of the highest mountain in the south eastern Xizang, and Ⅳ2 Sub regi on of slide debris flow type of composite sediment disasters of high.