耦合地貌信息熵和流域单元物质响应率的泥石流危险性评价

发布时间：2018-07-10 02:47

本文选题：泥石流 + 危险性评价　；参考：《科学技术与工程》2017年16期

【摘要】：以粤西高州马贵河流域为靶区,通过地貌信息熵法分析了流域地貌发育演化阶段和泥石流沟谷危险性;提出了流域单元物质响应率的概念,并结合遥感影像解译得到的松散物质分布,探讨了泥石流沟谷的物源敏感性;在此基础上,将地貌信息熵值和流域单元物质响应率进行耦合,开展地形和物源复合作用下的泥石流危险性评价研究。结果表明:研究区地貌信息熵值的变化范围为0.139 8~0.878 7;沟谷地貌演化从幼年期至老年期均有分布,59.07%的研究区面积处于幼年期-壮年期,泥石流沟谷比较活跃、危险性大;单元物质响应率的变化范围为0~0.171 6,54.60%的沟谷对物源较敏感;基于地貌信息熵值和流域单元物质响应率耦合的泥石流危险性评价结果表明,42.79%的泥石流沟谷处于中等及以上危险区域,泥石流危险性较大。对比分析发现评价结果和实际情况较为吻合,评价结果合理,优于上述两种方法单独评价的结果。该成果可以为马贵河流域防灾减灾、经济建设布局等提供依据,具有重要的工程实际意义和应用价值。
[Abstract]:Taking the Magui River basin of Gaozhou in western Guangdong as the target area, the geomorphologic evolution stage and debris flow gully risk are analyzed by means of geomorphologic information entropy method, and the concept of material response rate of watershed unit is put forward. Combined with the loose material distribution obtained from remote sensing image interpretation, the source sensitivity of debris flow gullies is discussed, and the geomorphological information entropy value and the material response rate of watershed unit are coupled on this basis. The risk assessment of debris flow under the combined action of landform and material source was carried out. The results show that the range of information entropy of geomorphology in the study area is 0.139 ~ 0.8787.The area of the study area in which the geomorphologic evolution of the gully is distributed from infancy to old age is 59.07%, and the debris flow valley is active and dangerous. The variation range of unit material response rate is 0.171 6 / 54.60% and the debris flow hazard assessment based on the coupling of geomorphological information entropy value and unit material response rate shows that 42.79% of debris flow gullies are in the middle or above dangerous area. Debris flow is dangerous. The comparative analysis shows that the evaluation results are in good agreement with the actual situation, and the evaluation results are reasonable and superior to those of the two methods mentioned above. The results can provide basis for disaster prevention and mitigation, economic construction layout and so on in Magui River basin, and have important engineering practical significance and application value.
【作者单位】：广东省地理空间信息技术与应用重点实验室;广州地理研究所;
【基金】：广东省水利厅科技创新项目(2016-15) 广东省科技计划(2015B070701020,2013B03070005,2014A020218013,2013B031500007) 广东省科学院创新人才引进项目(2017GDASCX-0803)资助
【分类号】：P642.23

【相似文献】