洪涝灾害风险评估单元选取方法研究  

Study on Selection Methods of Flood Disaster Risk Assessment Unit

作　　者：罗海婉 黄国如[1,2,3] LUO Hai-wan;HUANG Guo-ru(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China;Guangdong Engineering Technology Research Center of Safety and Greenization for Water Conservancy Project,Guangzhou 510640,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640 [3]广东省水利工程安全与绿色水利工程技术研究中心,广东广州510640

出　　处：《水电能源科学》2021年第3期24-27,共4页Water Resources and Power

基　　金：国家重点研发计划(2017YFC1502704);国家自然科学基金项目(51879108);广州市科技计划项目(201803030021)。

摘　　要：洪涝灾害风险评估单元是风险评估研究的最小单元,反映了风险评估对象的细节,选取合理的评估单元可保证风险图的准确性和精度、提高数据处理速度和存储空间利用率。为此,梳理了常用的洪涝灾害风险评估单元选取方法,论述了洪涝灾害风险尺度的概念,分析了风险评估单元、地图比例尺与制图分辨率等要素之间的关系,并以东濠涌流域土地利用为例进行分析。结果表明,人眼明视距离下的适宜制图分辨率为0.10~0.20mm,评估单元适宜边长计算公式为R′gL=LR′0.25M/0.25。The flood disaster risk assessment unit,the smallest unit in risk assessment studies,reflects the details of a risk assessment object.A reasonable selection of assessment unit can guarantee the accuracy and precision of the risk map as well as improve the data processing speed and storage space utilization.For that reason,commonly used selection methods of flood disaster risk assessment unit are studied,and the concept of flood disaster risk scale is discussed.By analyzing the relationship among risk assessment units,map scales and mapping resolution with an example of the land use in the Donghaochong basin,the results show that the appropriate mapping resolution for the least distance of distinct vision is 0.10mm to 0.20mm,and the calculation formula for the suitable side length of the assessment unit is R′g,L=LR′0.25M/0.25.

关 键 词：洪涝灾害 评估单元 空间分辨率 地图比例尺 

分 类 号：TV122[水利工程—水文学及水资源] P429[天文地球—大气科学及气象学]