渭河（临潼段）河水与地下水相互作用研究

发布时间：2018-02-08 17:31

本文关键词： 地下水与河水相互作用地下水温度模拟弯曲河流温度示踪法　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：弯曲河流地下水与河水相互作用强烈,研究弯曲河流地下水与河水的相互关系,有助于深入了解地下水与河水的补排关系,为傍河取水、污染物运移的研究提供科学依据。本论文采用温度示踪法研究弯曲河流河水与地下水的关系,用温度示踪具有测量方法简单、成本低、能够进行连续观测等优点。同时地下水温度分布特征能够很好的反映出河水与地下水不同的补排关系。以渭河临潼段为试验点,测量弯曲河流不同观测点位置不同埋深处地下水水位及温度,分析地下水与河水的补排关系及温度分布特征。参照渭河临潼段试验点的水文地质条件,建立理想模型。根据模拟结果,分析弯曲河流不同位置处地下水与河水相互作用的关系,及地下水温度场的分布特征。研究内容及研究结论如下:1)当河水水温随时间周期性变化时,地下水温度也发生周期性变化。在地下水补给河水的区域,地下水温度随河水温度周期性变化幅度小,而在河水补给地下水的区域,地下水温度随河水温度周期性变化幅度大,在时间上,地下水温度变化滞后于河水温度变化。2)埋深较浅的地下水,在水平方向上距离河流越近,地下水温度与河水温度越接近,距离河流越远,地下水温度与河水温度差别越大。在垂向上,地下水埋深越浅,地下水温度与河水温度越接近,地下水埋深越大,地下水温度与河水温度差别越大。在地下水补给河水的地方,等温线密集,温度梯度大,河水对地下水温度变化影响有限;在河水补给地下水的地方,等温线稀疏,温度梯度小,地下水温度受河水温度变化影响大,影响距离远。3)渗透系数对地下水温度场分布有重要影响。不同的位置处,渗透系数变化对地下水温度分布影响不同。在地下水补给河水的地方,地下水温度与河水温度差别大,地下水温度场变化受渗透系数变化影响小;在河水补给地下水的地方,地下水温度与河水温度接近,地下水温度场变化受渗透系数变化影响大。4)河流上下游水位差变化对地下水温度场的影响与渗透系数改变对地下水温度场的影响一致,都是通过影响地下水流速,进而影响地下水温度场。
[Abstract]:Bend River groundwater and river water interaction is strong, the relationship between bending River groundwater and river water, contribute to a deeper understanding of the relationship between groundwater and river water supply and drainage, water is near the river, to provide scientific basis for the study of the relationship between pollutant transport. The temperature of river meandering river and groundwater tracer, tracer with temperature the method is simple, low cost, can carry out continuous observation and so on. At the same time the distribution characteristics of groundwater temperature can well reflect the relationship between river and groundwater in different row up. In the Weihe section of Lintong was conducted at different observation points position measuring curved river different depth of groundwater level and temperature, analysis of groundwater and river water supply and drainage the relationship between temperature and distribution. According to the hydrogeological conditions of Weihe Lintong test section of the establishment of an ideal model. According to the simulation results, analysis of river bend Flow between different positions of interaction between stream and groundwater, and groundwater temperature field distribution characteristics. The research contents and research conclusion are as follows: 1) when the water temperature changing with time, the temperature of groundwater also changed periodically. In the area of groundwater recharge, groundwater temperature with small amplitude periodic variation of river water temperature however, in the area of river water recharge groundwater, groundwater temperature with water temperature periodic variation, in time, the temperature of groundwater change lags behind the change of river water temperature.2) shallow groundwater, in the horizontal direction from the river near the groundwater temperature is close to the water temperature, far from the river, the difference the temperature of groundwater and river water temperature is high. In the vertical, the shallower groundwater table, groundwater and river water temperature is close to the temperature, the greater the depth of groundwater, underground water temperature and water temperature The greater the difference in degree of groundwater recharge the river where the isotherms intensive, large temperature gradient, the influence of temperature change on groundwater recharge of groundwater in the river; where the temperature gradient is small, sparse isotherm, the temperature of groundwater from the influence of temperature change, influence of distance.3) permeability coefficient has an important effect on groundwater temperature field distribution at different positions, the permeability coefficient changes affect the distribution of temperature in different groundwater. Groundwater recharge of river water, groundwater and river water temperature, temperature difference, water temperature changes due to variation of permeability coefficient has little influence on the local groundwater recharge; river water, groundwater and river water temperature close to the temperature, the water temperature change of permeability coefficient the change of.4) river water level change on groundwater temperature field and the permeability coefficient change on groundwater temperature field. The noise is consistent, all of which affect the groundwater flow velocity, and then influence the temperature field of the groundwater.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P641.2;P339

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