【摘要】：鹽城市市域面積約有1.7萬km2,處于江蘇省北部平原,區(qū)域內(nèi)水系發(fā)達是江蘇省非常重要的沿海城市。從新世紀以來的長年累月對區(qū)域內(nèi)含水層的開采,已經(jīng)使得研究區(qū)局部的地下水水位持續(xù)下降,造成了比較嚴峻的地下水降落漏斗并對當?shù)氐牡刭|(zhì)和生態(tài)環(huán)境造成了較大影響。鹽城市地下水動態(tài)模擬,模擬期確定為2005年3月至次年3月一整年,利用所收集的這段時期的區(qū)域地下水位數(shù)據(jù),結(jié)合鉆孔數(shù)據(jù),區(qū)域巖性分布等,初步得出研究區(qū)含水層各項參數(shù),初始水位,邊界條件等,如此先構(gòu)建起三維的水文地質(zhì)模型。該模型共有9層組成,包括有1層的潛水含水層和4層承壓含水層,由于在每層之間存在有弱透水層,故又在每層之間增加了弱透水層,如此建立起一共9層的含水層組成的地下水系統(tǒng)。通過對比實測的2006年3月數(shù)據(jù)來對模擬的流場和實際的流場進行識別驗證。經(jīng)過調(diào)整后,滿足與實際流場流向走勢一致,且重要監(jiān)測井處得出的水位與實際的數(shù)據(jù)間的誤差在要求范圍內(nèi)。并且對整個系統(tǒng)計算其水平衡后,得出該區(qū)域基本符合水量平衡的要求:系統(tǒng)年接受補給的水量約有4.30×109m3,年均排泄的水量為4.48×109m3,大約全年的均衡差為-1.88×108m3,處于負均衡。文章根據(jù)鹽城市發(fā)展計劃、地下水開采規(guī)劃和節(jié)水各項措施的現(xiàn)狀以及發(fā)展,對研究區(qū)短期未來至2025年的地下水動態(tài),給出了不同情況下的開采地下水的方案并逐一對運行模型進行模擬。結(jié)果表明當開采井分布大體不變的情況下,潛水的水位在第1種方案下主要降落漏斗水位上升至-1.03m;第2種方案下含水層形成了新的降落漏斗,主要降落漏斗水位下降至-1.5m;表明潛水含水層易受到開采量變化的影響。承壓水含水層在方案1、2的情況下,總體流場趨勢降落漏斗數(shù)量并未發(fā)生太大變化,變化主要集中于部分區(qū)域的降落漏斗中心水位發(fā)生不同幅度的上升或下降。
[Abstract]:About 17000 km2, of Yancheng City is located in the northern plain of Jiangsu Province, and the water system is a very important coastal city in Jiangsu Province. Since the beginning of the new century, the exploitation of the aquifer in the region for many years has caused the local groundwater level in the study area to continue to decline, resulting in a severe groundwater drop funnel and a great impact on the local geological and ecological environment. The dynamic simulation of groundwater in Yancheng city is determined as the whole year from March 2005 to March 2005.Using the regional groundwater level data collected during this period, combined with borehole data, regional lithologic distribution, etc. The parameters, initial water level and boundary conditions of the aquifer in the study area are preliminarily obtained, and a three-dimensional hydrogeological model is constructed. The model consists of nine layers, including a submersible aquifer with one layer and a confined aquifer with four layers. Due to the existence of a weak permeable layer between each layer, a weakly permeable layer is added between each layer. A system of groundwater consisting of nine aquifers is thus established. The simulated flow field and the actual flow field are identified and verified by comparing the measured data in March 2006. After adjustment, the trend of flow direction is consistent with the actual flow field, and the error between the water level obtained from the important monitoring well and the actual data is within the required range. After calculating the water balance of the whole system, it is concluded that the region basically meets the requirement of water balance: the annual recharge water volume of the system is about 4.30 脳 10 9 m3, the average annual discharge water volume is 4.48 脳 10 9 m 3, and the balance difference of the whole year is -1.88 脳 10 8 m 3. In a negative equilibrium. According to the development plan of Yancheng City, the present situation and development of groundwater exploitation planning and water-saving measures, the paper discusses the groundwater dynamics in the study area from the short term to 2025. The scheme of groundwater exploitation under different conditions is given and the operation model is simulated one by one. The results show that under the first scheme, the main drop funnel water level rises to -1.03m. Under the second scheme, a new landing funnel was formed, and the water level of the main drop funnel decreased to -1.5 m, indicating that the aquifer is vulnerable to the influence of the variation of the extraction rate. In the case of scheme 1 / 2, the number of falling funnel in the general flow field does not change much, and the change is mainly concentrated on the increase or decrease of the central water level in some regions.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P641.6

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