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濰坊市北部地下水漏斗區(qū)含水層調(diào)蓄庫容與調(diào)蓄能力研究

發(fā)布時間:2018-10-20 16:47
【摘要】:近年來,由于過量開采地下水,濰坊市北部地區(qū)形成了大范圍的地下水降落漏斗,而漏斗區(qū)產(chǎn)生了連續(xù)的儲水空間。地下水漏斗區(qū)容易引起地面沉降、地面裂縫、海咸水入侵、水環(huán)境污染等環(huán)境地質(zhì)災害及生態(tài)環(huán)境破壞現(xiàn)象,同時,由于地下水位持續(xù)下降,很容易加速地表污水的下滲速度,加劇地下水的污染程度。然而,我們可以充分利用這些空間,興建地下水庫,在豐水期儲存水資源,在枯水期調(diào)用水資源,實現(xiàn)豐補枯采。這樣,既能控制地下水位下降趨勢,遏制降落漏斗的發(fā)展;又能充分儲存利用水資源,減少由于地表水庫中的水資源暴露于地表由蒸發(fā)引起的大量浪費。本研究通過收集濰坊市北部社會經(jīng)濟狀況、自然地理概況、地下水超采狀況、水文地質(zhì)條件等資料,分析研究區(qū)地質(zhì)構(gòu)造,劃分水文地質(zhì)單元。同時,選取研究區(qū)有代表性的鉆孔,繪制水文地質(zhì)剖面圖,來刻畫地下含水層的空間分布狀態(tài)。然后根據(jù)土壤粒級將地下空間劃分為透水層、弱透水層和不透水層。其中,透水層再細分為潛水含水層、微承壓水含水層和承壓水含水層。最后,利用松散巖型地下水調(diào)蓄公式計算研究區(qū)調(diào)蓄庫容。地下水庫的庫容是指地下水庫有效儲水部分的空隙體積,庫容計算僅考慮這些空間儲存重力水的體積,不包括介質(zhì)的體積。本文采用三種方法計算研究區(qū)調(diào)蓄庫容,并進行分析比較。本研究還借助GMS空間建模,繪制地下水庫三維實體模型?梢缘贸,濰坊調(diào)蓄區(qū)段內(nèi)地下水補給源條件及調(diào)蓄條件良好,具有很好的儲蓄水能力。研究區(qū)的調(diào)蓄庫容為10.68億m3,可開采量為8.54億m3。本研究為濰坊市利用地下空間儲存水資源提供了數(shù)據(jù)保障。利用地下空間調(diào)蓄徑流的基本原理是在枯水期及枯水季節(jié)利用地下儲存水量,抽取超出天然徑流量的地下水,騰出地下儲水空間(即地下水庫調(diào)蓄庫容),從而獲取枯水期及枯水年所需要的水資源;而在豐水期再通過天然回灌或人工補給,把地下儲水空間重新填滿,補充恢復地下水資源量。通過建立地下水庫調(diào)蓄能力綜合評價指標體系,對指標體系進行灰色關聯(lián)分析,將指標精簡為七個來評價地下水庫調(diào)蓄能力。七個指標分別為:最大調(diào)蓄庫容、調(diào)蓄層導水系數(shù)、現(xiàn)狀條件下庫區(qū)多年平均降水總量、現(xiàn)狀條件庫區(qū)多年平均河川徑流總量、現(xiàn)狀條件地下水多年平均可開采資源量、含水層單井涌水量、現(xiàn)狀條件多年平均地下水補給資源量。然后采用投影尋蹤方法對濰北區(qū)壽光、寒亭、昌邑評價其調(diào)蓄能力。最后,對地下水庫蓄水效益進行分析。利用地下水庫蓄水,同時具備經(jīng)濟效益、資源效益、環(huán)境效益和社會效益。本研究為濰坊市地下水利用提供了技術支撐。
[Abstract]:In recent years, due to excessive exploitation of groundwater, a large area of groundwater drop funnel has been formed in the northern area of Weifang City, and a continuous water storage space has been generated in the funnel area. Groundwater funnel area is easy to cause ground subsidence, ground cracks, sea salt water invasion, water environment pollution and other environmental disasters and ecological environmental damage phenomenon. At the same time, due to the continuous decline of groundwater level, it is easy to accelerate the infiltration rate of surface sewage. Increase the level of groundwater pollution. However, we can make full use of these spaces to build underground reservoirs, to store water resources in high water periods, and to transfer water resources in dry seasons to realize abundant and dry mining. In this way, not only the downward trend of groundwater level can be controlled, the development of falling funnel can be restrained, but also the water resources can be fully stored and utilized, and a large amount of waste caused by evaporation can be reduced due to the exposure of water resources in surface reservoirs to the surface. This study analyzed the geological structure of the study area and divided the hydrogeological units by collecting the data of social economy, natural geography, groundwater overexploitation and hydrogeological conditions in the northern part of Weifang. At the same time, the representative boreholes in the study area are selected to draw hydrogeological profiles to depict the spatial distribution of underground aquifers. Then the underground space is divided into permeable layer, weak permeable layer and impervious layer according to soil grain level. Among them, the permeable layer is subdivided into submersible aquifer, microconfined aquifer and confined water aquifer. Finally, the storage capacity of the study area is calculated by using the loose rock groundwater storage formula. The reservoir capacity of underground reservoir refers to the void volume of the effective water storage part of underground reservoir. The calculation of reservoir capacity only considers the volume of gravity water stored in these spaces excluding the volume of medium. In this paper, three methods are used to calculate the storage capacity of the studied area and to analyze and compare it. The 3D solid model of underground reservoir is also drawn by GMS spatial modeling. It can be concluded that the recharge and storage conditions of groundwater in Weifang section are good and have good water storage capacity. The storage capacity of the study area is 1.068 billion m3 and the recoverable capacity is 854 million m3. This research provides the data guarantee for Weifang city to use underground space to store water resources. The basic principle of using underground space to regulate runoff is to use underground storage water during dry season and dry season to extract groundwater that exceeds natural runoff. To free up the underground water storage space (that is, the storage capacity of the underground reservoir) so as to obtain the water resources needed during the dry season and the dry year; and to refill the underground water storage space through natural recharge or artificial recharge during the high water season, Replenish the amount of groundwater resources to be restored. Through the establishment of the comprehensive evaluation index system of the underground reservoir storage capacity, the grey relational analysis of the index system is carried out, and the index is reduced to seven to evaluate the underground reservoir regulation and storage capacity. The seven indexes are as follows: maximum storage capacity, reservoir conductivity, annual average precipitation in the reservoir area under current conditions, total annual average river runoff in the reservoir area under current conditions, and annual average recoverable resource amount of groundwater in current condition. Single well discharge of aquifer, current condition, annual average groundwater recharge resource. Then the projection pursuit method was used to evaluate the storage capacity of Shouguang, Hanting and Changyi in Weibei District. Finally, the water storage efficiency of underground reservoir is analyzed. Using underground reservoir to store water has economic benefit, resource benefit, environmental benefit and social benefit at the same time. This study provides technical support for groundwater utilization in Weifang.
【學位授予單位】:山東農(nóng)業(yè)大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:P641.8

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