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Evaluation of crustal stability in the lower Yellow River region

机译：黄河下游地区地壳稳定性评价

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The evaluation of crustal stability in the lower Yellow River region (LYR) is vital to the engineering project of the Yellow River embankment and construction of the Huang-Huai-Hai plain. From three aspects of tectonic stability, surface stability and medium stability, this paper analyzes in detail the factors such as tectonic activity, tectonic stress, exogenic geologic disasters and ground material composition which affect crustal stability in the study area and the spatial distributions of subordinate degree of the evaluation factors. It then constructs the crustal stability evaluation model of fuzzy mathematics based on GIS by using AHP to find out the interrelations among the various factors, comprehensive evaluation of fuzzy mathematics and the functions of spatial overlay and spatial database of ArcGlS. Based upon this the crustal stability evaluation is carried out, the results show that the areas of stable and instable regions are basically the same, being 48.72 percent and 51.28 percent respectively. The area of moderate stable region takes a dominant position, being about 70.58 percent. The crust instable region presents zonal distribution and under the control of tectonic faulted belt. But the region where the LYR runs across is mostly instable with a total length of the river being 568.345 km, or 78.93 percent of all. The river reach where the crustal stability is relatively poor along the LYR is concentrated in the Lankao-Dongping section.
机译：黄河下游地区的地壳稳定性评估对黄河堤防工程项目和黄淮海平原的建设至关重要。从构造稳定性，地表稳定性和介质稳定性三个方面，详细分析了构造活动，构造应力，外生地质灾害和地物成分等因素对研究区地壳稳定性和下级空间分布的影响。评价因素。然后利用层次分析法，建立了基于GIS的模糊数学地壳稳定性评价模型，找出了各个因素之间的相互关系，对模糊数学进行了综合评价，并建立了ArcGls的空间覆盖和空间数据库功能。在此基础上进行了地壳稳定性评价，结果表明，稳定区和不稳定区的面积基本相同，分别为48.72％和51.28％。中度稳定地区占主导地位，约为70.58％。地壳不稳定区呈带状分布，受构造断裂带控制。但是，LYR穿越的地区大部分是不稳定的，河流总长度为568.345公里，占总数的78.93％。沿LYR地壳稳定性相对较差的河段集中在Lankao-Dongping段。

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