干旱灌区封闭型和开敞型水文地质单元的水盐动态监测研究

Research on the Monitoring of Water-salt Dynamic in Closed and Open Hydrogeological Units of Arid Irrigation Areas

通过对甘肃景电二期灌区地下水盐运移的连续监测资料的分析,研究了干旱灌区内封闭型水文地质单元和开敞型水文地质单元的地下水盐演化运移的态势。研究表明:干旱灌区内不同水文地质单元的水盐演化和运移均受控于灌区内的人工灌溉和土壤水入渗-蒸发过程,区域水盐的运移总体呈径流滞缓、局部水盐积累的特点。开敞型水文地质单元地下水盐呈振荡型变化,封闭型水文地质单元的汇水聚盐带地下水矿化度和土壤含盐量均呈逐年上升趋势,是灌区内土壤次生盐碱化形成的主要原因。

Based on the monitoring data of second stage project of Jingdian Irrigation Area （JIA）, The evolution and transportation rules of groundwater and salt in the closed and open hydro-geological units of JIA are analyzed. The results show that the water-salt transportation is mainly controlled by infiltrated irrigation water and that a slow flow and water-salt accumulation in the local area tendency. For the open hydro-geological unit, the groundwater and salt indicate a vibrated change tendency. For the hydro-geological unit, groundwater salinity and soil content indicate an annual steady increase tendency, which is the main cause for the salinization of the irrigation area.