地下水咸淡水混合带动态特性试验研究

Experimental investigation the mechanismsof freshwatersaltwater transition zone in groundwater

应用电导率法，通过大型移流弥散砂槽模型试验，成功地测到了混合带，并对混合带及其动态特性进行了观测、分析和研究，在总体水头的水平梯度方向与浓度的水平梯度方向（弥散的反方向）相反的条件下，得到了咸水入侵进慢退快、混合带发展演化过程中有回咸现象以及介质分层、高浓度等试验的部分规律。部分成果对滨海地区水资源的规划、管理和海（咸）水入侵的预防、治理以及移流弥散问题的物理模型、数学模型的研究有参考意义和实际应用价值。

Laboratory experiments of dispersion in large scale sand box were used to investigate the mechanisms of the freshwatersaltwater transition zone by using conductivity electrode. The transition zone and its dynamic characteristic were observed, analyzed and studied under the condition of steady water level and sudden changed water level, carrying out the dispersion experiments in homogeneous media and in two layered medium with 35 g·L-1 and 60 g·L-1 boundary concentration of saltwater. The results in this study have rather good reference significance and practice applied value for preventing and controlling of the sea water intrusion, and for physical and mathematical model research of the advectiondispersion problem.