磴口县地表水与地下水时空变化特征及交互作用

Spatiotemporal Variability and Interaction of Surface Water and Groundwater in Dengkou County

为了揭示磴口县地表水及地下水的时空分布特征及其交互作用,将磴口县的17口实验井分为4组,结合EM D(Empirical M ode Decomposition)算法和协同克里金算法对地下水埋深进行时空特征分析,利用3S技术对磴口县的地表水与地下水进行空间叠加和趋势曲线拟合,从南北和东西方向分析了地表水和地下水的变化趋势特征。结果表明:(1)磴口县北部和西部地下水埋深在1990—2015年呈减少的趋势,中部和东南部呈增加的趋势;西南部存在地下水漏斗区域,经过治理,情况已经得到改善。(2)磴口县地表水域面积在1990—2015年变化不大,自西向东,先增加后降低,最后再升高,总体呈增多的趋势;从北往南,先增加后降低,最后再升高,整体分布也呈增加的趋势。(3) 1990—2005年磴口县地下水补给的主要来源为黄河。

In order to reveal the spatiotemporal variability of surface water and groundwater with their interaction in Dengkou County,EMD algorithm and co-kriging model were used in this study based on four groups data divided by 17 experimental wells. The spatiotemporal variability between surface water and groundwater in Dengkou County were analyzed by 3 S technology from east to west and south to north with spatial overlay and trend curve fitting.Results show that:( 1) Groundwater depth in northern and eastern Dengkou County showed a decreasing trend in the period of 1990—2015,with an increasing trend in the center and southeast. The area of groundwater depression in southeastern Dengkou County has reduced by governance.( 2) The area of surface water in Dengkou County had little change in the period of 1990—2015. It increased fist and then decreased,and at last increased again,which showed an increasing trend from both west to east and north to south.( 3) The main recharging source of groundwater in Dengkou County is the Yellow River in the period of 1990—2005.