Research On Landslide Evolution Mechanism Of The Gulf Region Based On Dissipative Structure Theory

The multiple and the severity of landslide disasters directly affect the sustainable development of the economy and society and each aspect of our life. The landslide exchanges material,energy and information with the outside world continuously during its evolutional process, which perform nonlinear behaviors. The application of nonlinear theory, such as Catastrophe Theory,Dissipative Structure Theory,Chaos Theory,Coordination Theory and Fractal Theory, provide a new method for the landslide research. On the basis of absorbing the existing domestic and international research result, the thesis uses the Dissipative Structure Theory to porform the theoretical and positive research on theoretic and experimental researches on the evolution mechanism of landslide distater regarding Xiamen gulf region as the background, establish the Dissipative Structure model of landslide eolution, and reveal the nonlinear mechanism of landslide disaster system. The main research contents of the thesis are listed as follows:1. The status of the landslide disaster research at home and abroad is discussed, the problems of research in this field are presented, the application status in Geoscience of Dissipative Structure Theory is analyzed. On this basis, research thinking and technique route of the thesis are put forward.2. Through the fact-finding and analysis, the formative environment of landslide disasters in Xiamen gulf region is mastered, the main features of landslide disaster are concluded and summarized, and the spatial and temporal distribution of landslide disasters in Xiamen gulf region is also revealed.3. Four subsystems, namely, the rock and soil mass subsystem,social subsystem,environment subsystem and groundwater system are constructed in this thesis, and the interaction among the four subsystems is explained in detail, and the Dissipative Structure characteristics of landslide disaster system is also analysed.4. Internal incitant factors and external trigger factors which give rise to the fluctuation of landslide disaster system are analysed. The Dissipative Structure model of the landslide disaster system is constructed, and combining the model, the evolution mechanism of landslide disaster system is analysed.5. The concepts of "landslide entropy", "landslide negentropy" and "landslide total entropy" are proposed, and the factors affecting landslide entropy and landslide negentropy are analysed. The instability criterion of rock and soil mass based on landslide total entropy and the quantum comptutation method of landslide total entropy are put forward, and the characteristic of the entropy variation of landslide disaster system caused by each influencing factor is quantified analysed.6. Two different strategies are proposed to ensure stability of landslide disaster system. One is to postpone or decrease landslide entropy's increase, the other is to increase the flow of landslide negentropy. Measures are proposed by adjusting the landslide entropy to prevent landslide disasters from occurring.7. Taking landslide disaster in the Bei shi Granite Mine, Hai cang District, Xiamen City as an example, the occurrence mechanism of landslide disaster is analyzed by using the Dissipative Structure Theory, and using the comparison of landslide total entropy, the rationality of the landslide adjustment measures by quantitative calculation is verified.The research results will reveal the Dissipative Structure nonlinear mechanism of landslide disaster system evolution, and provide an overly new sketch and method for landslide disaster prevention and control.