本文選題：泥質(zhì)潮灘 + 海底地下水排泄��； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：隨著海岸帶經(jīng)濟(jì)的高速發(fā)展,濱海含水層中受到潮波影響的地下水流的研究已經(jīng)成為了水文地質(zhì)和生態(tài)環(huán)境領(lǐng)域的一個熱點(diǎn)、重要課題。在過去的三十年里,濱海含水層水動力學(xué)的數(shù)值模擬工作得到了快速發(fā)展。本文選取了崇明島南岸潮間帶地下水含水層為研究對象,在潮灘上選取了一個豎直剖面,使用自動傳感器對研究區(qū)潮灘地下水和潮汐的壓力水頭、溫度和鹽度進(jìn)行自動觀測。在濱海含水層中,隨海潮的周期性變化的地下水位包含了重要的水文地質(zhì)信息。本文通過收集、分析崇明島水文地質(zhì)、海潮、海洋水文和氣象等資料,并使用二維有限單元法數(shù)值模擬軟件MARUN,建立了中等尺度數(shù)值模型,從而對地下水水頭進(jìn)行了數(shù)值模擬。通過對研究區(qū)相關(guān)資料和地下水水位、溫度、鹽度等觀測資料的分析可以得出:崇明島長江南支水位受海潮波動的影響顯著,表現(xiàn)為每天兩個不同周期的不規(guī)則半日潮以及以15天為周期的大小潮。長江南支江水為淡水,且鹽度低于內(nèi)陸地下水鹽度。崇明島南岸潮灘含水層泥質(zhì)含量多,其滲透性不好,江水水位波動在含水層中迅速衰減。本文分析了崇明島南岸剖面的觀測數(shù)據(jù),并用MARUN進(jìn)行了觀測數(shù)據(jù)的數(shù)值擬合和模型參數(shù)的校正�；谝巴庥^測數(shù)據(jù)和室內(nèi)數(shù)值模擬,得出了以下結(jié)論:研究區(qū)剖面含水層的橫、縱向滲透系數(shù)、儲水率、孔隙度等幾個主要的水文地質(zhì)參數(shù)的估算值分別為8×10-7m s-1、4×10-7m s-1、10-5 m-1、0.4。在一個完整大小潮周期,研究區(qū)海岸處的SGD量為0.46 m3d-1m-1,內(nèi)陸淡水純補(bǔ)給量為0.08m3d-1m-1(即陸源淡水SGD)占SGD總量的17.4%。
[Abstract]:With the rapid development of coastal zone economy, the study of groundwater flow affected by tidal waves in coastal aquifer has become a hot and important topic in the field of hydrogeology and ecological environment. In the past 30 years, the numerical simulation of coastal aquifer hydrodynamics has been developed rapidly. In this paper, the groundwater aquifers in the intertidal zone along the south coast of Chongming Island are selected as the research objects, a vertical section is selected on the tidal flat, and the pressure head, temperature and salinity of the tidal flat groundwater and the tide in the study area are observed automatically by using the automatic sensor. In the coastal aquifer, the groundwater level, which changes periodically with the tide, contains important hydrogeological information. By collecting and analyzing the hydrogeological, tidal, marine hydrological and meteorological data of Chongming Island, a mesoscale numerical model has been established by using the two-dimensional finite element method software Marun to simulate the groundwater head. Based on the analysis of the relevant data and the observation data of groundwater level, temperature and salinity, it can be concluded that the water level in the south branch of the Yangtze River in Chongming Island is significantly affected by the fluctuation of the sea tide. The results show that there are two irregular semidiurnal tides with two different cycles each day and the large and small tides with a period of 15 days. The water in the south branch of the Yangtze River is fresh water, and the salinity is lower than that of inland groundwater. The muddy aquifer in the south coast of Chongming Island is rich in mud, and its permeability is not good, and the fluctuation of river water level decays rapidly in the aquifer. In this paper, the observed data of the south coast of Chongming Island are analyzed, and the numerical fitting of the observed data and the correction of the model parameters are carried out by using Marun. Based on field observation data and indoor numerical simulation, the following conclusions are drawn: the estimated values of several main hydrogeological parameters, such as horizontal, longitudinal permeability coefficient, water storage rate and porosity, are 8 脳 10 ~ (-7) m ~ (-1) ~ 4 脳 10 ~ (-7) m ~ (-1) -10 ~ (-5) m ~ (-1), respectively. In a complete tidal cycle, the amount of SGD at the coast of the study area is 0.46m3d-1m-1, and the net replenishment of inland freshwater is 17.4% of the total 0.08m3d-1m-1.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P641;P333

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