流域地表水与地下水转化关系的时空变化规律研究

Study on the temporal and spatial variation of the conversion relationship between surface water and groundwater in the basin

流域地表水与地下水转化关系的时空变化规律是水资源管理和保护的关键问题之一。本研究旨在通过取样调查上中下游地表水和地下水的TDS含量和同位素变化影响,揭示流域地表水与地下水之间的转化过程及其时空变化规律。结果表明,在枯水期,无论是在上中下游,干流地表水的TDS均大于干流地下水,在上游甜水河地下水的TDS沿流程递增,而甜水河地下水的TDS基本不变。在枯水期δD和δ^(18) O值均发生了贫化。枯水期通常伴随着气候干燥和高温的条件,这些条件促使水体发生蒸发作用。

The temporal and spatial variation of the conversion relationship between surface water and groundwater is one of the key issues in water resources management and protection.The purpose of this study is to reveal the transformation process and its spatial and temporal variation between surface water and groundwater in the basin by sampling and investigating the influence of TDS content and isotope changes in surface water and groundwater in the upper,middle and lower reaches.The results show that in the dry season,the TDS of surface water in the mainstream is greater than that of groundwater in the mainstream,whether in the upper,middle and lower reaches.In the upstream,the TDS of groundwater in the Tianshui River increases along the flow path,while the TDS of groundwater in the Tianshui River is basically unchanged.TheδD andδ^(18) O values were depleted during the dry season.The dry season is usually accompanied by dry climate and high temperature conditions,which promote the evaporation of water.