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。
This paper took the Magui watershed,Gaozhou City,in West of Guangdong Province as the study area. The method of geomorphology information entropy was used to analyze the developmental stages of the geomorphologic evolution and debris flow hazard degree. The concept of response rate of watershed unit material was proposed and the provenance sensitivity of debris flow gullies was explored combining the distribution of loose materials interpretated by remote sensing images. On these bases,the values of geomorphology information entropy and response rates of watershed unit material were superimposed to conduct debris flow hazard assessment by coupling the conditions of geomorphology and loose materials. The results show that： the range of the value of geomorphic information entropy is between 0. 139 8 and 0. 878 7 in the study area,valley geomorphic evolution is distributed from childhood to old age,and 59. 07% of the study area in its childhood to maturity stage and the debris flow valleys are active and dangerous; the range of response rate of watershed unit material is between 0 and0. 171 6 in the study area,the high,less high and moderate degrees of provenance sensitive areas accounted for54. 60% of the total area and the result of debris flow hazard assessment by coupling the geomorphology information entropy and response rates of watershed unit material indicates that more than 42. 79% of the debris flow watersheds are located in moderate and above moderate hazard zones,where debris flow activity seems dangerous. It is found by comparative analysis that the result is consistent with the watershed actual situation and the result is reasonable and effect which is better than the results of the two methods of single evaluation. This study result can be applied to the plan of debris flow hazard zones and provide reference for debris flow mitigation of Magui watershed which has great engineering significances and application value.
出处
《科学技术与工程》
北大核心
2017年第16期21-27,共7页
Science Technology and Engineering
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
关键词
泥石流
危险性评价
地貌信息熵
流域单元物质响应率
物源敏感性
debris flow
hazard assessment
geomorphology information entropy
response rate of watershed unit material
provenance sensitivity
