汾河上游河道渗漏对晋祠泉域岩溶地下水影响的数值模拟研究

发布时间：2018-05-27 09:02

本文选题：晋祠泉域 + 渗漏量　；参考：《太原理工大学》2017年硕士论文

【摘要】：山西省碳酸盐岩类分布广泛,约占全省面积的五分之一,沉积的厚度可以达到千米以上,岩溶水资源蕴藏量丰富。晋祠泉域是山西省内19个岩溶泉域之一,泉域范围内的岩溶地下水是太原市工业、农业和生活用水的重要来源,具有相当的资源价值和观赏价值。多年来,由于大量无计划的开采岩溶水及采煤排水,使晋祠泉域的供水能力大大削减,导致晋祠泉在20世纪90年代中期就出现了断流。晋祠泉是千年古泉,面对千年古泉的断流,应当采取措施加强岩溶水资源的合理开发利用及保护,使晋祠泉早日复流。因此,研究晋祠泉的复流方案对泉域岩溶水的保护有重要意义。目前,关于晋祠泉域这一区域的研究有很多,前人大多对晋祠泉域地下水位的影响因素和各个因素对泉域地下水的影响程度做了充分的研究,得出晋祠泉域地下水位的骤减主要受到降水量的减少,人工超采和采煤排水等因素的影响;而关于泉域的补给,尤其是对汾河上游河道的渗漏量对泉域岩溶地下水影响的研究很少。因此,本文运用数值模拟方法,研究了汾河上游河道渗漏量的变化对晋祠泉域岩溶地下水位的影响,并指出不同方案下晋祠泉的复流时间。全文共分为三个部分:第一部分:对晋祠泉域、汾河渗漏段的基本概况,地质条件,水文地质条件等进行了深入分析;第二部分:根据汾河上游水文测站的径流量资料,利用上游来水量与漏失系数之间的规律,对汾河上游河道的多年渗漏量进行了计算;第三部分:基于Visual MODFLOW建立地下水流模型,通过改变模型中汾河河道的渗漏量的大小,探讨了其对泉域地下水位的影响。研究结果表明,汾河渗漏量的增加对晋祠泉域岩溶地下水位回升起积极作用,且渗漏量越大,水位回升越快,泉水复流的时间越早。因此,可以通过加大汾河渗漏补给这一手段实现晋祠泉的复流。这项研究为晋祠泉的复流和岩溶地下水的保护提供了参考依据。
[Abstract]:Carbonate rocks are widely distributed in Shanxi Province, accounting for about 1/5 of the province area. The thickness of the deposits can reach more than km, and the karst water resources are abundant. Jinci spring region is one of 19 karst spring regions in Shanxi Province. Karst groundwater in spring area is an important source of industrial, agricultural and domestic water in Taiyuan, which has considerable resource value and ornamental value. For many years, the capacity of water supply in Jinci Spring region has been greatly reduced because of a large amount of unplanned karst water and coal mining drainage, which led to the breakage of Jinci Spring in the middle of 1990s. Jinci spring is a thousand years old spring. In the face of the flow breakage of thousand years old spring, measures should be taken to strengthen the rational development, utilization and protection of karst water resources so as to make Jinci spring reflow as soon as possible. Therefore, it is of great significance to study the reflow scheme of Jinci spring for the protection of karst water in spring region. At present, there is a lot of research on this area of Jinci Spring region. Most of the predecessors have made sufficient research on the influencing factors of groundwater level in Jinci Spring region and the influence degree of each factor on the groundwater level in Jinci Spring region. It is concluded that the sudden decrease of groundwater level in Jinci spring area is mainly affected by the decrease of precipitation, artificial overmining and coal mining drainage, etc. Especially, there is little research on the effect of river leakage on karst groundwater in the upper reaches of Fenhe River. Therefore, in this paper, numerical simulation method is used to study the influence of the leakage of upper reaches of Fenhe River on the karst groundwater level in Jinci Spring region, and the reflow time of Jinci Spring under different schemes is pointed out. The paper is divided into three parts: the first part: the basic situation, geological conditions, hydrogeological conditions and so on of the Jinci spring area, the Fenhe seepage section, etc. The second part: according to the runoff data of the hydrological station in the upper reaches of Fenhe River, By using the law between upstream water quantity and leakage coefficient, the leakage amount of the upper reaches of Fenhe River is calculated. The third part: the groundwater flow model is established based on Visual MODFLOW, and the leakage amount of Fenhe river is changed by changing the quantity of leakage in the model. Its influence on groundwater level in spring region is discussed. The results show that the increase of the leakage of Fenhe River plays a positive role in the recovery of karst groundwater level in Jinci spring area, and the larger the leakage amount, the faster the water level rises and the earlier the spring water reflows. Therefore, we can increase the leakage of Fenhe recharge this means to achieve the return of Jinci spring. This study provides a reference for the reflow of Jinci spring and the protection of karst groundwater.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P641.134

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