Research On Model And Realization Technology Of Marine Geology Environment Evaluation

The Geology Environment, a part of the natural environment system, is the surface layer of the geosphere that is related to mankind most directly and most closely. Marine Geology Environment is the ocean,offing,coast zone of the geology environment and the offing and the coast zone is the most active area between the ocean and the land. Form the angle of the system, the marine geology environment has two characters of the whole and the difference. From the angle of geology environment evaluation, people search the index system to measure the whole and the difference of the marine geology environment. Form the last 60s the mature index system of single factor geology environment quality evaluation have been set up, but the muti-factors synthetical evaluation is more based on the knowledge of the experts to evaluate qualitatively. In the text the method of system modeling is used to describe the difference of the quality of the marine geology environment. It searches after the quantifying of synthetical evaluation and provides a reliable gist for scientifically establishing marine exploitation ,programming ,marine engineering ,against and decreasing disaster. So it is significant to the theory and the practice. In the text combining with the result of the special subject research of《The Hazardous Geology Map and Hazardous Geology Environment Evaluation in the South China Sea》, collecting well and making use of the former data and setting up the model of geology environment evaluation to quantitatively evaluate the stability of hazardous geology in the north of South China Sea. First, by the research of the hazardous geologic circumstance in the north of South China Sea, three kinds of different geologies environment evaluation models are gave, namely simple stability degree evaluation model, complex stability degree evaluation model and weight sum stability degree evaluation model. In the simple statistics model its emphasis on the quantity of the kinds of the hazardous geology factors in the geology environment system. It figures the sea bottom stability by the amount of the kinds of the hazardous geology factors in a target area. This kind of method supposes that the hazardous geology factors tally with ideal average distribution regulation on the whole and each element's grade differences not very. It is intuitionistic and apt to realize by the simple statistics model, but because its supposal of the premise is not easy satisfied, the result of the calculation may appear the deviation. In the complex statistical model its emphasis on the proportion of the individual number to the whole number of the hazardous geology factors in the geology environment system. It figures the stability of the sea bottom by the entropy of the informational function. This kind of method can dissolve the influence of each factor distributing not equably, reflect the variety of the spatial distribution of the hazardous geology elements in target area more objectively. The same, this method not yet considers the grade of the hazardous geology elements and their contrasts to importance, and the result of the evaluation is still approximate. In weight sum statistical model its emphasis on the individual number of the hazardous geology factor and the contract of the importance among the kinds. It applies the method of the weight sum synthetical exponential to calculate the stability, this kind of method can provide the pertinent evaluation project for the different applied purpose and evaluate the stability more reasonably. It considers the number of the kinds,individual number of the hazardous geology factors and objectively reflects the spatial distributing of hazardous geology factors in the target area; It combines experts'knowledge and considers grades of different kinds of hazardous geology factors namely the impact on the stability of the sea bottom; by making the target area to be girding It not only decreasesinfluence of the target area's area on the result of the evaluation, but also reflects difference of the same hazardous geology factor in distribution. Weight sum stability degree model will be well used in the future. According the different evaluation target we can select the different model to evaluate. It is adaptive to the simple stability degree model and the complex stability degree for the synthetical evaluation which objective is the natural property of the geologic environment, but the applying range of the weight sum stability degree model is more large, it is not only adaptive to the synthetical evaluation which objective is the natural property of the geologic environment, but also adaptive to the synthetical evaluation which objective is the special engineering, and the weight value of the hazardous geology factor can be modified according the different need, that provides variety for the different purposes. It is a satisfied result by the three models that the areal geologic environmental synthetical quantitive evaluation on the hazardous geologic stability in the north of the South China Sea, and it provides the new thought and method of the marine areal geologic environmental evaluation. The technique to realize the geology environment evaluation was also discussed in the text. Establishing evaluation model and GIS spatial statistical method is realized by the RAD programming tool of Delphi5.0 as development tool and development mode according to MapInfo MapX 4.0 controls of the ActiveX in 《The marine hazardous geologic stability evaluation information system 》.The system constitutes of three parts, graphical customer interface,terrace & evaluation model and database. The design and realization of the graphical customer interface had been completed by Delphi5.0; The terrace of GIS adopted control piece of MapX4.0; the evaluation model was realized in the development environment of Delphi5.0 by Pascal language combing the functions that the MapX4.0 provides. The part of database had been completed by the interface structure of the MapX Geosets, and the operation of related property data had been settled by data binding (Data Binding).