| 内蒙古鄂尔多斯西北土壤水流动示踪实验及自流井群补给源讨论 |
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| 关键词:Ordos Basin simulation tests rainfall infiltration soil water film water isotope |
| 基金项目:国家“973”项目(编号: 2012CB417005) |
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| 摘要: |
| Soil Water Flow Tracer Test in Northwest Ordos Basin, Inner Mongolia and Discussion on Recharge Resources of Artesian Wells |
| Precipitation simulation tests prove that, maximum depth of single rainfall infiltration in northern Ordos sandy stratum is less than 1 m. Precipitation discharges to the atmosphere in the soil by evaporation. Tests confirm that only when the soil moisture content is greater than the maximum field moisture capacity, can film water on the surface of the soil particles overcome electromagnetic attraction and turn into gravitational water to infiltrate under gravity. Annual rainfall in northern Ordos is small but evaporation is large, rainfall infiltration water does not form a cumulative effect or continuous gravity water flow in the soil. Isotopic tracing analysis shows that soil water mainly comes from phreatic water. Combined with the analysis of soil moisture content and TDS, confirm that groundwater supply to the soil water through the way of film water and evaporation-condensation mode. Film water flows from high to low temperature area. For isothermal film water, it flows from thick to thin layer. Isotope analysis suggests that rivers, springs, wells, lakes, soil water in Dusitu River basin receive the same allogenic water supply. Precipitation of Ordos Basin enriches of heavier isotopes than surface water and groundwater. This does not conform to the precipitation isotope characteristics of recharge area. Groundwater watershed of Ordos Basin coincides with the basement fault zone. According to this, allogenic water supplies to the Ordos Basin through the basement fault zone and forms the artesian well group in dry areas. |
| CHEN Jian-sheng,YANG Guang-liang,WANG Ting,HE Wen-zheng,HE Hai-qing,CHEN Xi-xi.2014.Soil Water Flow Tracer Test in Northwest Ordos Basin, Inner Mongolia and Discussion on Recharge Resources of Artesian Wells[J].Acta Geoscientica Sinica,35(3):365-374. |
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