本文選題：泥石流 + 危險性評價��； 參考：《科學技術與工程》2017年16期

【摘要】：以粵西高州馬貴河流域為靶區(qū),通過地貌信息熵法分析了流域地貌發(fā)育演化階段和泥石流溝谷危險性;提出了流域單元物質(zhì)響應率的概念,并結合遙感影像解譯得到的松散物質(zhì)分布,探討了泥石流溝谷的物源敏感性;在此基礎上,將地貌信息熵值和流域單元物質(zhì)響應率進行耦合,開展地形和物源復合作用下的泥石流危險性評價研究。結果表明:研究區(qū)地貌信息熵值的變化范圍為0.139 8~0.878 7;溝谷地貌演化從幼年期至老年期均有分布,59.07%的研究區(qū)面積處于幼年期-壯年期,泥石流溝谷比較活躍、危險性大;單元物質(zhì)響應率的變化范圍為0~0.171 6,54.60%的溝谷對物源較敏感;基于地貌信息熵值和流域單元物質(zhì)響應率耦合的泥石流危險性評價結果表明,42.79%的泥石流溝谷處于中等及以上危險區(qū)域,泥石流危險性較大。對比分析發(fā)現(xiàn)評價結果和實際情況較為吻合,評價結果合理,優(yōu)于上述兩種方法單獨評價的結果。該成果可以為馬貴河流域防災減災、經(jīng)濟建設布局等提供依據(jù),具有重要的工程實際意義和應用價值。
[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.
【作者單位】： 廣東省地理空間信息技術與應用重點實驗室;廣州地理研究所;
【基金】：廣東省水利廳科技創(chuàng)新項目(2016-15) 廣東省科技計劃(2015B070701020,2013B03070005,2014A020218013,2013B031500007) 廣東省科學院創(chuàng)新人才引進項目(2017GDASCX-0803)資助
【分類號】：P642.23

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