A study of the characteristics of groundwater flow system of a basin under variable density condition based on a physical sand box model
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摘要: 在干旱半干旱地区，沉积盆地是人类生产、生活用水的主要载体，为查明在水流自身密度改变条件下盆地地下水流系统的变化特征，需在变密度条件下对盆地地下水流系统进行模拟研究。本文采用砂槽物理模型，在改变区域性水流密度条件下模拟研究地下水流系统的变化规律。试验结果显示：随着区域性水流密度的增加，区域水流系统的渗流速度和循环量均减少，且流线径流距离和径流深度也随之减小；而局部水流系统的渗流速度和循环量均增加。结果表明区域性水流密度的增加会抑制区域水流系统的发育，对局部水流系统有一定增强作用。本研究着重强调了区域性水流自身密度变化对盆地地下水流系统所产生的影响，并通过物理试验模拟得出在改变区域性水流密度条件下盆地地下水流系统的变化规律。Abstract: In arid and semi-arid areas, sedimentary basins are the main carriers for water-supply of production and living of human being. In order to find out the change characteristics of groundwater flow systems in a basin under the condition of the change in the water flow density, it is necessary to simulate the groundwater flow systems in the basin under the condition of variable density of water. In this paper, a sand box physical model is used to simulate the change chatracteristics of groundwater flow systems under the condition of changing regional water density. The results show that with the increasing regional flow density, the flow velocity and circulation of the regional flow system decreases, and the streamline distance and the runoff depth also decrease, while the flow velocity and circulation of the local flow system increase. The results also show that the increasing regional water density will inhibit the development of the regional groundwater system and enhance the local flow system. This study places its emphases on the influence of the change in regional water flow density on the groundwater flow system in the basin, and obtains the variation law of the groundwater flow system in the basin under the condition of changing regional water flow density through the physical experiment simulation.
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Key words:
- variable density /
- basin /
- groundwater flow system /
- sand box model
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