密怀顺地下水库建设对周边地下水环境影响研究

发布时间：2018-03-02 12:44

本文选题：南水北调　切入点：人工回灌　出处：《中国地质大学（北京）》2014年硕士论文　论文类型：学位论文

【摘要】：南水北调水源进京后，本地水资源结构将发生很大改变，可将本地盈余的地表水以及南水北调过程中丰水年及平水年的余水等，人工回灌到地下水库中进行储存，以提高北京市供水保证程度。本文研究区位于北京市东北部，研究范围为密云、怀柔以及顺义区潮白河向阳闸以北的平原区。结合南水北调来水调蓄工程，开展地下水专项研究。通过回灌河道现场淋滤试验、建立包气带数值模型以及含水层数值模型，对地下水进行分析，科学评价回灌入渗对地下水环境响程度及影响范围。本论文的主要成果包括以下几点：（1）本次研究在回灌区典型河道进行现场包气带淋滤试验，通过分析监测孔水质离子浓度结果可知：包气带中发生了明显的阳离子交换吸附作用；土体颗粒表面吸附氨氮或者淋溶过程中土壤中发生了轻微的硝化反应；土壤中的物理淋溶作用明显。各监测孔水质中的化学组分浓度总体上较低，表明潮白河河道包气带土样较为纯净，未受到地表污染源污染。（2）论文在查明受水区水文地质条件及其它影响因素的基础上，对潮白河地区回灌场地的包气带作了具体分析，利用数值模拟软件HYDRUS建立了潮白河包气带水流数值模型。模拟结果表明，回灌河道水头较小时，回灌期290天内，在保证12km回灌河道有水的情况下，通过包气带底部边界流出的水量最小值为9.676×109m3。（3）利用地下水数值模拟软件GMS建立地下水流数值模型，预测不同调蓄工况下地下水水位的变化趋势。根据密云调蓄工程已批复的设计方案，南水北调余水于2014年末至2019末回补地下水，回补时段为每年的3月1日至12月15日共计290天，制定了9种补水方案。通过模拟结果分析，，在方案九条件下地下水水位抬升值最大，水位涨幅最高点达7m左右，北部地区总体水位标高小于35m，中部、南部地区总体水位标高仍小于20m。（4）调查可知，研究区北部非正规垃圾填埋场底板标高均在50m以上，研究区中部、南部非正规垃圾填埋场底板标高总体在30m以上。最终得出结论：回灌导致的地下水水位抬升不会浸泡非正规垃圾填埋场，即密怀顺地下水库建设不会影响周边地下水水质。
[Abstract]:After the South-to-North Water diversion Project enters Beijing, the structure of the local water resources will be greatly changed. The local surplus surface water and the surplus water from the abundant and normal water years during the South-to-North Water transfer process can be artificially recharged to the underground reservoirs for storage. In order to improve the guarantee degree of water supply in Beijing, the research area is located in the northeast of Beijing. The research scope is Miyun, Huairou and the plain area north of Chaobaihe Xiangyang sluice in Shunyi District. Through the field leaching test of recharge channel, the numerical model of aeration zone and aquifer are established to analyze the groundwater. Scientific evaluation of the impact of recharge infiltration on groundwater environment and scope. The main achievements of this paper include the following points:. 1) in this study, the leaching test of aeration zone was carried out in typical river channels in the irrigated area. The results of ion concentration analysis showed that: the cation exchange adsorption occurred in the aeration zone; A slight nitrification reaction occurred on the surface of soil particles during the process of adsorption of ammonia nitrogen or leaching, the physical leaching of soil was obvious, and the concentration of chemical components in the water quality of the monitoring holes was generally low. The results show that the soil sample of Chaobai River is relatively pure and not polluted by surface pollution. On the basis of finding out the hydrogeological conditions and other influencing factors in the water-receiving area, the paper makes a concrete analysis on the aeration zone of the recharge site in Chaobaihe area. The numerical simulation software HYDRUS is used to set up the numerical model of water flow in Chaobai River in aerated zone. The simulation results show that the water head of the recharge channel is small, and the recharge period is 290 days, under the condition that there is water in the 12 km reclaimed channel. The minimum outflow of water through the bottom boundary of the aeration zone is 9.676 脳 10 ~ (9) m ~ (3). A numerical model of groundwater flow is established by using the groundwater numerical simulation software GMS to predict the change trend of groundwater level under different storage conditions. According to the approved design scheme of Miyun Regulation and Storage Project, From end of 2014 to 2019, the remaining water of the South-to-North Water diversion Project was used to replenish the groundwater. The period of recharge was 290days from March 1st to December 15th of each year. Nine schemes of water recharge were formulated. The simulation results were analyzed. Under the condition of scheme 9, the groundwater level rise and rise is the biggest, the highest point is about 7 m, the total water level is less than 35 m in the north area, and the total water level elevation in the central and southern regions is still less than 20 m. (4) the investigation shows that the floor height of the informal landfills in the northern part of the study area is above 50 m, and the middle part of the study area is located in the middle of the study area. It is concluded that the groundwater level rise caused by recharge will not soak in the informal landfill site, that is, the construction of Mishuashun underground reservoir will not affect the water quality of the surrounding groundwater.
【学位授予单位】：中国地质大学（北京）
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV697.25;P641

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