石佛寺水库陈平堡副坝段浸没程度分析与评价

发布时间：2018-06-26 18:45

本文选题：水库浸没 + 影响因素　；参考：《沈阳农业大学》2017年硕士论文

【摘要】：水库具有防洪、发电、灌溉、供水、水产养殖等功能,但是,当水库正式投入运行后,随着水库蓄水水位的不断升高,地下水位受到顶托而升高,水库周边浸没灾害现象凸显。因土壤物理性质、地下水位变化等原因,浸没灾害区域内的植物生长将受到影响,开始萎蔫甚至死亡,而建筑的地基也会遭到破坏。本研究以石佛寺水库周边浸没区域为研究对象,综合分析了该区域浸没的产生机理,初步划定了浸没边界。利用地下水模拟软件,建立了研究区地下水数值模型,预测了不同蓄水位下的地下水位变化情况。通过建立的浸没危害评价体系,结合灰色聚类评估模型,对研究区域内的浸没灾害进行综合评价。该体系纳入了多种评价指标,增强了评价结果的客观性,进而为今后浸没区域的治理提供了合理依据。主要研究结论如下:(1)利用水尺观测拉马河水位变化,对水库蓄水位和河道水位进行相关性分析,可知水库蓄水产生的回水现象对拉马河水位影响明显,为浸没产生的原因之一;通过对河道两岸浸没区域进行土样采集,分析土壤含水率变化,可知地形对浸没程度产生影响;分析浸没区地下水位与其影响因素的相关性,得出相关性由大到小的排列顺序:蓄水位空气温度降雨量蒸发量风速。以上对研究区域浸没现状进行的分析,可为水库浸没评价体系的建立及浸没评价提供参考依据。(2)通过三维地下水模拟软件,利用由石佛寺水库工程地质剖面图所提取的研究区域钻孔数据和插值法生成的虚拟钻孔数据构建研究区域三维地质模型,对其进行网格剖分后导入土壤数据参数,形成地下水数值模型,经过校核修正后用于计算不同水库蓄水水位下的浸没区地下水位,依据浸没判定标准,可知当蓄水水位为正常蓄水位46.2m时,研究区域内严重浸没范围占到研究区域总面积的85%以上,浸没灾害严重。同时,计算所得水位数据可用作浸没区综合评价参数资料。(3)针对浸没评价因素单一的问题,本研究将多种影响作物生长的相关因素(含水率、天然孔隙比、饱和度等)作为评价指标,针对每种因素制定量化的标准,依据层次分析法建立浸没评价指标体系,结合白化权函数灰色评估法进行浸没区浸没危害程度评价。根据评价结果可知,浸没区域浸没危害情况严重,该区域的土壤并不适宜作物种植。评价结果可为浸没区的合理赔偿及治理提供依据。
[Abstract]:The reservoir has the functions of flood control, power generation, irrigation, water supply, aquaculture and so on. However, when the reservoir is put into operation, with the increasing of the reservoir water level, the groundwater level is increased by the top support, and the phenomenon of immersion disaster around the reservoir is prominent. Because of the physical properties of soil and the change of groundwater level, the plant growth in the disaster zone will be affected, wilting and even dying, and the foundation of the building will be destroyed. In this study, the immersion area around Shifosi reservoir is taken as the research object, the mechanism of the immersion in the area is analyzed synthetically, and the immersion boundary is preliminarily delineated. By using groundwater simulation software, a numerical model of groundwater in the study area is established, and the variation of groundwater level under different water levels is predicted. The comprehensive evaluation of the immersion hazards in the study area was carried out by using the established immersion hazard assessment system and the grey cluster evaluation model. The system includes a variety of evaluation indexes, enhances the objectivity of evaluation results, and provides a reasonable basis for the future governance of submerged areas. The main conclusions are as follows: (1) using the water ruler to observe the Lama river level change, the correlation analysis of the reservoir water level and the river water level is carried out, it is known that the backwater phenomenon produced by the reservoir impoundment has obvious influence on the Lama river level, which is one of the reasons for the immersion; Through the collection of soil samples on both sides of the river channel, the variation of soil moisture content is analyzed, and the influence of topography on the degree of immersion is found, and the correlation between groundwater level and its influencing factors in the submerged area is analyzed. The order of correlation from large to small is: air temperature, precipitation, evaporation, wind speed. The above analysis of the present situation of immersion in the study area can provide a reference for the establishment and evaluation of reservoir immersion evaluation system. (2) through three-dimensional groundwater simulation software, The 3D geological model of the study area was constructed by using the borehole data extracted from the engineering geological profile of Shifosi reservoir and the virtual borehole data generated by interpolation method. A numerical model of groundwater is formed, which is used to calculate the groundwater level of the submerged area under the water level of different reservoirs after checking and revising. According to the criterion of submergence, it is known that when the water level is 46.2m, More than 85% of the total area in the study area is seriously submerged, and the disaster is serious. At the same time, the calculated water level data can be used as the comprehensive evaluation parameter data of the submerged area. (3) aiming at the problem of single factor of immersion evaluation, this study studies on the related factors (water content, natural void ratio) that affect the growth of crops. As an evaluation index, aiming at each factor, the quantitative standard was established, and the evaluation index system of immersion was established according to AHP, and the degree of immersion hazard was evaluated by grey evaluation method of whitening weight function. According to the evaluation results, the submergence damage in the submerged area is serious, and the soil in the area is not suitable for crop cultivation. The evaluation results can provide the basis for the reasonable compensation and management of the submerged area.
【学位授予单位】：沈阳农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV698

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