基于稳健回归-去趋势波动分析法的山前平原地下水转换关系研究

Study on Groundwater Conversion Relationship in Piedmont Plain Based on Robust Regression-De-Trend Fluctuation Analysis

以大别山-云应盆地北部山前平原为研究区,以区内浅层含水层中地下水为研究对象,在查明研究区双层含水层结构条件的基础上,利用降雨量和地下水水位动态数据,采用稳健回归-去趋势波动分析(r-DFA)方法,对降雨和地下水水位动态的全局标度指数α进行量化,分析研究区各类型含水层中地下水之间的转换关系。结果表明:研究区地下水水位波动为分形布朗运动,且分形行为具有场地特异性;QbW风化裂隙水受到侧向径流的影响,含水层渗透性差,地下水水位标度指数最大;在双层含水层中,垂向上从上到下地下水水位标度指数增大,指明Qhal和Qpal3孔隙水均可转化为Ey孔隙-裂隙水;沿澴水东侧径流方向上,地下水水位标度指数增大,指明QbW风化裂隙水可转换为Qpal3孔隙水和Ey孔隙-裂隙水,Qpal3孔隙水也可转化为(排泄至)Qhal孔隙水。该研究结果可为山前平原区地下水资源的合理开发利用和科学管理提供依据。

The Dabie Mountain piedmont plain and the shallow groundwater in this area is studied in ths paper. Based on the identification of the structural conditions of the two-layer aquifer in the area and the dynamic data of rainfall and groundwater level,the paper uses the robust Detrend Fluctuation Analysis(r- DFA)method to quantify the scale index a of rainfall and groundwater level dynamics,and analyzes the conversion relationship between various types of groundwater in the study area.The results show that the groundwater level fluctuation is fractal Brownian motion,and the fractal behavior has site anisotropy.QbW weathering fissure water is affected by lateral runoff,the aquifer permeability is poor,and the scaling exponent is the largest.In the two-layer aquifer,in vertical,the groundwater scaling exponent increases from top to bottom,Qhal and Qpal 3pore water is converted into Ey pore fissure water.Along the direction of groundwater runoff of east side of the Huanshui River,the groundwater scaling exponent increases,and QbW weathered fissure water is converted into Qpal 3pore water and Ey.Porous fissure water,Qpal 3pore water is converted into Qhal pore water.This study can provide a basis for the rational development and utilization and scientific management of groundwater resources in the piedmont plain.