成都市地下水脆弱性評(píng)價(jià)
[Abstract]:Water resources is an important environmental factor, and human life is inextricably linked. With the improvement of economic level, the expansion of urbanization and the rapid increase of population, the demand for groundwater resources has also been increased. Therefore, it is very important to prevent groundwater resources from being damaged and to realize the long-term development of groundwater resources. Nowadays, the related work of groundwater vulnerability assessment in foreign and domestic countries is increasing gradually, and it can be seen that groundwater has the risk of being destroyed. It is the foundation of protecting groundwater system to do well the assessment work of groundwater vulnerability. In recent years, the rapid development of Chengdu's economy, the large-scale expansion of urban area, and the number of factories have multiplied, leading to the emergence of water resources that Chengdu is proud to be in short supply. Due to unreasonable exploitation of groundwater resources and pollution of groundwater by various factors, Chengdu's traditional advantage of "large quantity of groundwater resources, large recoverable area, easy to exploit and good water quality" has been destroyed. It is urgent to carry out groundwater vulnerability assessment in Chengdu area to provide guidance for local water resources management department to take groundwater protection measures in accordance with Chengdu city conditions, and to better protect groundwater resources. This paper introduces the concept of groundwater vulnerability at home and abroad, and the evaluation method of groundwater. At the same time, according to the object of this study, the social economy, natural geography of Chengdu, The hydrogeology and other aspects are briefly summarized. Based on the collection of water quality data of more than 400 shallow groundwater monitoring wells in the evaluation area, the present situation of groundwater quality in Chengdu is evaluated by using the comprehensive index method. The essential vulnerability of groundwater in Chengdu was evaluated by using DRASTIC model on Arcgis platform. The results showed certain regularity. The vulnerability in Quaternary region such as river terrace was higher than that in other regions. Selecting net recharge of aquifer, depth of groundwater, soil type, lithology of aeration zone, hydraulic conductivity coefficient of aquifer, aquifer medium, groundwater quality, current situation of land use and so on, a set of systematic evaluation system is constructed. In order to determine the weight of the evaluation index, the analytic hierarchy process (AHP) is usually used to establish the initial model of groundwater vulnerability assessment under the influence of human social activities. The groundwater vulnerability model based on human activities of ArcGis, is used to evaluate the special vulnerability of groundwater in Chengdu. The evaluation results are highly consistent with the essential vulnerability, and the area of high vulnerability increases due to the influence of human activities. The increase occurred mainly in urban industrial areas and areas with serious water pollution. According to the comprehensive evaluation results, the vulnerability of groundwater in Chengdu is similar to that of aerated zone media and aquifer media, which can accurately reflect the ability of groundwater to prevent damage, and thus become the groundwater management organization. Rational allocation of departments, the management of groundwater resources to provide an effective basis.
【學(xué)位授予單位】:成都理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:P641.8
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