|Alternative Title||Study on the debris flows system information entropy model|
|Place of Conferral||北京|
|Keyword||泥石流系统 能量分布 状态方程 信息熵 防灾减灾|
For disaster prevention and reduction key scientific issues of mountainous region/basin judgment of debris flow ditch and evaluation of risk degree of debris flows, in the main line of energy, combing with the system science and debris flow discipline, this paper systematically explored debris flows basin system information entropy model and applied to judgment of debris flow ditch and evaluation of risk degree of debris flows of Shenxi gully 41 sub-watersheds for validating the rationality of the method proposed in this paper. The main conclusions are as follows:(1) For the debris flow watershed system, established the corresponding state equation of debris flow watershed systemFor the debris flow watershed system, established three subsystems, landscape subsystem, provenance subsystem and hydrodynamic subsystem, and configured the state equation of each subsystem reflecting the energy distribution of the subsystems. The state variables of landscape subsystem were mainly constructed by area and elevation which could reflect the state of different gradient and slope. The state variables of provenance subsystem were mainly constructed by area and elevation of collapses and landslides which could reflect the distributed and stored state of collapse and landslides materials in different locations. The state variables of hydrodynamic subsystem were mainly constructed by hydrodynamic (average soil moisture content and surface runoff) and elevation which could reflect the hydrodynamic conditions in different location. On above basis, the state equation of debris flow watershed system was established at last.(2) Based on the state equation of debris flow watershed system, the information entropy model of debris flow watershed system was established.According to the relationship of debris flow and energy distribution, the relationship of energy distribution and information entropy, the information entropy models of the three subsystems were established based their system state variables, respectively, and the information entropy model of debris flow watershed system was established by combing with the state equation of debris flow watershed system.(3) The disaster prevention and mitigation practice of the information entropy model of debris flow watershed systemAccording to the relationship of debris flow and energy distribution, the methods of identification of potential debris flow gully and assessment of debris flow hazard degree were proposed. The method of identification of potential debris flow gully, based on the special solutions of three subsystems entropy, was mainly divided the combining forms of three subsystems information entropy into two categories, namely active debris flow gully / potential debris flow gully and non - debris - flow gully. The debris flow assessment method was mainly based on the special solutions of three subsystems entropy which classified the debris flow hazard degree into five grades, namely very high dangerous, high dangerous, moderate dangerous, low dangerous and very low dangerous. (4) Carried out case study to validate the results of methods of identification of potential debris flow gully and assessment of debris flow hazard degree proposed in this paperTook the Shenxi gully in Hongkou village, Dujiangyan city, Sichuan province, China as the study area, the watershed was divided into 41 (ranged from 0 to 40) sub-watersheds according to the river net based on GIS technology. Based on the proposed methods in this paper, calculated the information entropy values of three subsystems of the divided 41 sub-watersheds and carried out the identification of potential debris flow gully and assessment of debris flow hazard degree. Through instance analysis and comparison of the former achievements, it found that the calculated results of proposed model in the paper were consistent with the actual situation and was more resonable and superior than that of the geomorphology information entropy method and the method of single debris flow gully hazard assessment proposed by Lin Xilin.(5) Developed analyzing software of debris flow system information entropy by using MATLAB softwareAccording to the theory and method of information entropy model of debris flow system, developed analyzing software of debris flow system information entropy by using MATLAB software, by which the identification of potential debris flow gully and assessment of debris flow hazard degree could be calculated efficiently and conveniently.
|宇岩. 泥石流系统信息熵模型研究[D]. 北京. 中国科学院大学,2016.|
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