本文關(guān)鍵詞： 地下水?dāng)?shù)值模擬 地下水資源評(píng)價(jià) 海水入侵　出處：《吉林大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：傅疃河是日照市海岸帶最大的入海河流,其中下游段目前分布有四個(gè)地下水水源地,分別為鵝莊水源地、曲河口水源地、丁家樓水源地以及河套水源地,為日照市主要城市飲用水水源地。傅疃河水源地作為日照市海岸帶主要飲用水供水水源,雖于80年代初做過地下水資源初步勘查,但隨著自然條件的變化、人類活動(dòng)的加劇,造成地下水資源的減少及地下水環(huán)境的惡化,使區(qū)域水文地質(zhì)條件已發(fā)生了較大變化。對(duì)研究區(qū)地下水的不合理開采,研究區(qū)出現(xiàn)了局部地下水位降落漏斗、東南沿海海水入侵潛水含水層等地質(zhì)問題。因此,為了保障傅疃河下游城市的供水安全,同時(shí)為保障水資源可持續(xù)利用提供科學(xué)依據(jù),對(duì)日照市傅疃河下游地區(qū)地下水資源進(jìn)行評(píng)價(jià)和預(yù)測(cè)有實(shí)際意義。本文對(duì)日照市傅疃河下游地區(qū)進(jìn)行了地下水資源評(píng)價(jià),采用數(shù)值法計(jì)算補(bǔ)給資源量,同時(shí)進(jìn)行了水質(zhì)評(píng)價(jià)。在評(píng)價(jià)過程中建立了研究區(qū)地層三維模型,再結(jié)合研究區(qū)水文地質(zhì)條件資料,建立了水文地質(zhì)概念模型,構(gòu)建數(shù)學(xué)模型,而后借助Visual Modflow軟件建立區(qū)域尺度地下水?dāng)?shù)值模擬模型,以地下水位觀測(cè)值和計(jì)算值的擬合程度為指標(biāo),通過識(shí)別驗(yàn)證模型來反演各分區(qū)水文地質(zhì)參數(shù)。在上述工作基礎(chǔ)上,建立海水入侵過程模型,進(jìn)行模型正演預(yù)報(bào),并提出防治措施,預(yù)報(bào)評(píng)價(jià)各情況下海水入侵發(fā)展趨勢(shì)。通過對(duì)研究區(qū)地下水資源評(píng)價(jià)和研究得到如下成果:研究區(qū)地下水化學(xué)特征從補(bǔ)給區(qū)到排泄區(qū)呈現(xiàn)明顯分帶性,水質(zhì)類型為HCO3-Ca型、HCO3-Ca·Na型、HCO3·Cl—Ca·Na型、HCO3·Cl—Na型、Cl—Na型。地下水流模型計(jì)算得到的現(xiàn)狀年地下水補(bǔ)給資源量為1.601?105 m3/d,其中大氣降水補(bǔ)給為8.057?104m3/d,地下水排泄量為1.491?105 m3/d,其中人工開采量為5.30?104m3/d,研究區(qū)地下水系統(tǒng)處于正均衡。利用地下水模型預(yù)測(cè)三個(gè)方案得到相應(yīng)地下水流場(chǎng)動(dòng)態(tài)變化和海水入侵發(fā)展趨勢(shì),其中方案三預(yù)測(cè)在崮河匯入傅疃河處設(shè)置攔河壩方案,通過增加地表水位,間接提高地下水位以減緩研究區(qū)東南沿海水產(chǎn)養(yǎng)殖區(qū)海水入侵速度。預(yù)報(bào)結(jié)果顯示,設(shè)置攔河壩只能減緩海水入侵問題但不能根本解決問題,解決辦法是控制沿海地區(qū)地下水的開采,合理利用地下水資源。
[Abstract]:Futuan River is the largest river in the coastal zone of Rizhao City. There are four groundwater sources in the lower reaches, namely, Gezhuang water source, Quhekou water source, Dingjialou water source and Hetao water source. As the main drinking water source in the coastal zone of Rizhao City, the Futuan River water source is the primary source of drinking water in Rizhao City. Although the groundwater resources were preliminarily surveyed in 80s, they change with the change of natural conditions. With the aggravation of human activities, the reduction of groundwater resources and the deterioration of groundwater environment have resulted in great changes in regional hydrogeological conditions and unreasonable exploitation of groundwater in the study area. In the study area, there are some geological problems, such as local groundwater level falling funnel, sea water intrusion into diving aquifer and other geological problems. Therefore, in order to ensure the safety of water supply in the lower reaches of Futuan River. At the same time, it provides the scientific basis for ensuring the sustainable utilization of water resources. It is of practical significance to evaluate and predict the groundwater resources in the lower reaches of Futuan River in Rizhao City. In this paper, the groundwater resources in the lower reaches of Futuan River in Rizhao City are evaluated, and the amount of recharge resources is calculated by numerical method. At the same time, the water quality was evaluated. In the process of evaluation, the stratigraphic 3D model of the study area was established, and then the hydrogeological concept model was established and the mathematical model was constructed by combining the hydrogeological condition data of the study area. Then the regional scale groundwater numerical simulation model is established with the help of Visual Modflow software, and the fitting degree between the observed and calculated groundwater level is taken as the index. Based on the above work, the seawater intrusion process model is established, the forward prediction of the model is carried out, and the prevention measures are put forward. Through the evaluation and study of groundwater resources in the study area, the following results are obtained: the chemical characteristics of groundwater in the study area are obviously zoned from recharge area to discharge area. The type of water quality is HCO3-Ca type, HCO3-Ca 路Na type, HCO3 路Cl-Ca 路Na type, HCO3 路Cl-Na type. Cl-Na model. Groundwater recharge resources calculated by groundwater model is 1. 601? 105 m3 / d, of which 8.057? 104m3 / d, groundwater discharge is 1.491? 105 m3 / d, of which 5.30? The groundwater system in the study area is in a positive equilibrium at 104 m3 / d. The groundwater model is used to predict the dynamic change of groundwater flow field and the trend of seawater intrusion. Among them, the third project predicts the establishment of the blocking dam scheme at the point where the Gushan River flows into the Futuan River. By increasing the surface water level, indirectly raising the groundwater level to slow down the sea water intrusion in the southeast coastal aquaculture area of the study area, the forecast results show that. The problem of sea water intrusion can only be alleviated but the problem can not be solved by setting blocking dam. The solution is to control the exploitation of groundwater in coastal areas and make rational use of groundwater resources.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P641.8

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