本文選題：地下水流系統(tǒng) + 排泄區(qū)　； 參考：《中國(guó)地質(zhì)大學(xué)》2016年博士論文

【摘要】：深入認(rèn)識(shí)地下水循環(huán)規(guī)律,是合理開(kāi)發(fā)利用地下水資源的基礎(chǔ)。地下水流系統(tǒng)理論揭示了地下水的系統(tǒng)性和結(jié)構(gòu)性,是研究地下水循環(huán)和演化的有力工具。本文以地下水流系統(tǒng)理論為指導(dǎo),以濟(jì)南巖溶水系統(tǒng)為研究對(duì)象,將濟(jì)南北部地?zé)崴c南部巖溶冷水作為整體進(jìn)行研究,基于研究區(qū)水文地質(zhì)條件,綜合應(yīng)用多種手段,來(lái)有效識(shí)別不同級(jí)次的地下水流系統(tǒng),分析地下水循環(huán)模式。將排泄區(qū)作為地下水流系統(tǒng)的“指紋”,通過(guò)提取和融合排泄區(qū)的一系列水文地質(zhì)信息(地質(zhì)條件、水位動(dòng)態(tài)、水化學(xué)、同位素等),來(lái)推測(cè)地下水循環(huán)模式：第四系淺層地下水屬于局部地下水流系統(tǒng),以高NO3-濃度、富集氫氧重同位素為特征,受當(dāng)?shù)卮髿饨邓苯尤霛B補(bǔ)給,部分地段受巖溶水頂托補(bǔ)給；巖溶冷水來(lái)自中間地下水流系統(tǒng),以均一的水化學(xué)類型(HCO3-Ca(Mg)型)、低NO3-濃度和相對(duì)偏負(fù)的氫氧同位素為特征,受到來(lái)自山前灰?guī)r裸露區(qū)的側(cè)向徑流補(bǔ)給,通過(guò)人工開(kāi)采和泉群排泄；巖溶熱水由區(qū)域地下水流系統(tǒng)經(jīng)深循環(huán)形成,以高Cl-、TDS濃度,貧氫氧重同位素和長(zhǎng)滯留時(shí)間為特征,來(lái)源于晚更新世時(shí)期(26.68-13.44 kaBP)溫度較低的大氣降水入滲補(bǔ)給,補(bǔ)給區(qū)位于泰山北麓高海拔地區(qū)。從地下水流系統(tǒng)的時(shí)間屬性出發(fā),利用滯留時(shí)間分布的不連續(xù)特征來(lái)識(shí)別不同級(jí)次的地下水流系統(tǒng)�？紤]地形起伏的復(fù)雜性,引入濟(jì)南地區(qū)真實(shí)數(shù)字高程到三維地下水流系統(tǒng)模型中,以地下水滯留時(shí)間概率密度函數(shù)中的拐點(diǎn)作為臨界滯留時(shí)間來(lái)劃分盆地地下水滯留時(shí)間場(chǎng),進(jìn)而識(shí)別不同級(jí)次的地下水流系統(tǒng)。分別設(shè)置不同的影響因子(入滲補(bǔ)給強(qiáng)度、介質(zhì)各向異性、熱運(yùn)移),根據(jù)模擬得到的盆地地下水滯留時(shí)間分布變化,以及不同級(jí)次水流系統(tǒng)的補(bǔ)給量和體積變化來(lái)定量分析不同因素對(duì)三維地下水流系統(tǒng)分布特征和循環(huán)模式的影響。選取典型剖面建立地下水流-年齡耦合數(shù)值模擬模型,模擬結(jié)果與概念模型分析一致：泰山北麓至齊廣斷裂發(fā)育多級(jí)次地下水流系統(tǒng),局部、中間和區(qū)域流動(dòng)系統(tǒng)嵌套分布,地形控制了不同級(jí)次水流系統(tǒng)的發(fā)育規(guī)模,含水層巖性變化是影響水流系統(tǒng)模式的重要因素。地下水年齡分布與水流系統(tǒng)密切相關(guān),地下水年齡沿流動(dòng)路徑整體呈變老趨勢(shì),內(nèi)部駐點(diǎn)附近地下水年齡存在突然增大的界面,是不同級(jí)次水流系統(tǒng)分界的重要標(biāo)志。本文的研究成果不僅加深了對(duì)濟(jì)南巖溶水系統(tǒng)地下水循環(huán)規(guī)律的認(rèn)識(shí),促進(jìn)當(dāng)?shù)氐叵滤Y源的合理開(kāi)發(fā)利用,也為地下水流系統(tǒng)理論的實(shí)踐應(yīng)用提供了參考。
[Abstract]:It is the foundation of rational exploitation and utilization of groundwater resources to deeply understand the regularity of groundwater circulation. The theory of groundwater flow system reveals the system and structure of groundwater and is a powerful tool to study the circulation and evolution of groundwater. Guided by the theory of groundwater flow system and taking the karst water system of Jinan as the research object, this paper takes the geothermal water in the north of Jinan and the karst cold water in the south of Jinan as a whole. Based on the hydrogeological conditions of the study area, a variety of methods are comprehensively applied. To identify the groundwater flow system and analyze the groundwater circulation model. The discharge area is used as the "fingerprint" of the groundwater flow system by extracting and integrating a series of hydrogeological information (geological conditions, water level dynamics, hydrochemistry) of the discharge area, Isotopes, etc., to infer the circulation model of groundwater: Quaternary shallow groundwater belongs to local groundwater flow system, characterized by high no _ 3- concentration, enrichment of hydrogen and oxygen heavy isotopes, and is recharged directly by local atmospheric precipitation. The karst cold water comes from the intermediate groundwater flow system and is characterized by the homogeneous hydrochemical type (HCO3-CaOMg) type, low NO3- concentration and relatively negative hydrogen and oxygen isotopes. By lateral runoff recharge from exposed areas of limestone in front of mountains, karst hot water is formed by deep circulation of regional groundwater flow system, characterized by high concentration of Cl-tds, heavy isotope of hydrogen and oxygen, and long residence time. The recharge of precipitation from the lower temperature during the late Pleistocene is 26.68-13.44 kaBP.The recharge area is located in the high altitude area of the northern foot of Mount Tai. Based on the time attribute of groundwater flow system, the discontinuous character of residence time distribution is used to identify the groundwater flow system of different order. Considering the complexity of terrain fluctuation, the real digital elevation of Jinan area is introduced into the three-dimensional groundwater flow system model, and the inflexion of the probability density function of groundwater retention time is taken as the critical retention time to divide the groundwater retention time field in the basin. Then the groundwater flow system of different order is identified. Different influencing factors (infiltration recharge intensity, medium anisotropy, thermal migration) were set up, and the groundwater retention time distribution in the basin was obtained by simulation. The effects of different factors on the distribution characteristics and circulation model of three dimensional groundwater flow system are quantitatively analyzed. The numerical simulation model of groundwater flow and age coupling is established by selecting typical sections. The simulation results are consistent with the conceptual model analysis: the multi-stage subgroundwater flow system is developed from the northern foot of Mount Tai to the Qi-guang fault, and the local, intermediate and regional flow systems are nested. The topography controls the development scale of different order water flow system, and the lithologic change of aquifer is an important factor influencing the flow system model. The age distribution of groundwater is closely related to the flow system, the groundwater age along the flow path shows a trend of aging, and there is a sudden increase in the groundwater age near the internal stationary point, which is an important indicator of the boundary of different order flow systems. The research results of this paper not only deepen the understanding of groundwater circulation law in Jinan karst water system, promote the rational development and utilization of local groundwater resources, but also provide a reference for the practical application of groundwater flow system theory.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：P641.134

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本文編號(hào)：1860682