摘要杭州市主城区市地处我国浙江省西北部,年降水量丰富,每年的夏秋台风季节和其他多 雨季节内易出现短时间的大量降水,从而引发城市内部洪涝。本研究主要使用 GIS 分析的手 段,通过对杭州市主城区 DEM 数据为基础,对其进行洼地提取,获得杭州市主城区内的洼地, 对其洼地深度进行分级。用杭州洼地提取和降雨分布图和土地利用类型图叠加得到杭州市城 市风险区划。研究显示高风险区主要集中在西湖区东南方向,余杭区东南方向,下沙经济技 术开发区的东北方向也有分布。而低风险区主要在西湖区的南北方向,余杭区的东北方向。 从前面的分析我们知道风险区的分布和洼地深度的分布和降雨量强度的分布图一致。88448
Hangzhou City, the main city is located in the northwest of Zhejiang Province, the annual precipitation is abundant, the annual summer and autumn typhoon season and other rainy season prone to a short period of time a large number of precipitation, causing the city floods。 Based on the DEM data of the main urban area of Hangzhou, this study mainly uses the method of GIS analysis to extract the depression from the depression, obtain the depression in the main urban area of Hangzhou, and classify the depression depth。With the Hangzhou depression to extract and rainfall distribution map and land use type map superimposed in Hangzhou city risk zoning。 research shows High-risk areas are mainly concentrated in the southeast of the West Lake District, Yuhang District, southeast direction, Xiasha Economic and Technological Development Zone in the northeast direction also distributed。 While the low-risk areas are mainly in the north-south direction of the West Lake area, Yuhang District, northeast direction。 From the previous analysis we know that the distribution of the risk zone and the distribution of the depth of the depression are consistent with the distribution of rainfall intensity。源Y于Y优E尔Y论L文W网wwW.yOueRw.com 原文+QQ752018.766
毕业论文关键词:洼地;GIS;城市内涝;土地利用;
Keyword: Depression;GIS; urban waterlogging;land use;
目 录
杭州市主城区城市内涝灾害风险评估研究 2
1。引言 5
1。1 研究意义 5
1。3 论文框架 7
2。研究区域与数据 8
2。1 研究区概况 8
2。1。1 地理环境概况 8
2。1。2 社会经济 8
2。1。3 内涝灾害 9
2。2 数据源 9
2。2。1 地理空间数据 9
3。研究目标及研究方法 9
3。1 研究目标 9
3。2 研究方法 10
3。2。1 总体思路 10
3。2。2 主城区洼地深度提取 10
3。2。3 主城区降雨模型的建立 14
3。2。4 土地利用类From优Y尔E论W文W网wWw.YouERw.com 加QQ75201,8766 型原理 15
4。结果和分析 16
4。1 结果 16
4。2 结果分析