地表暖化影响下温度示踪地下水流速方法  

Temperature Tracing Method for Groundwater Flux Under Surface Warming

作　　者：董林垚[1,2] 任洪玉 雷俊山[3] 刘纪根 Dong Linyao;Ren Hongyu;Lei Junshan;Liu Jigen(Changjiang River Scientific Research Institute , Changjiang Water Resources Commission , Wuhan 430010, China;Research Center on Mountain Torrents and Geological Disaster Prevention , Ministry of Water Resources , Wuhan 430010;Changjiang Water Resources Protection Institute , Changjiang Water Resources Commission , Wuhan 430051, China)

机构地区：[1]长江水利委员会长江科学院,武汉430010 [2]水利部山洪地质灾害防治工程技术研究中心,武汉430010 [3]长江水利委员会长江水资源保护科学研究所,武汉430051

出　　处：《吉林大学学报（地球科学版）》2019年第3期773-783,共11页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(41501037);水利部技术示范项目(SF-201806)~~

摘　　要：为构建温度示踪方法测算地下水流速技术体系,并应用于区域地下水资源评价,基于最小二乘法和垂向一维非稳定流水-热运移方程数值解法,提出地表暖化情形下地下水流速计算方法,并对雷州半岛东北部地下水流速进行测算。结果表明:研究区域地下水补给速度为0.796m/a,入渗以西北部降水和运河渗漏为主;地下水排泄速度为0.269m/a,排泄入海主要发生在东海岛、南三岛和硵州岛附近。温度示踪解析区域地下水流动情况与地下水位分布情况基本一致,观测和计算地温数据具有较强相关性(R^2>0.50)和较低均方根误差(均值0.748),表明提出方法率定得到的地下水流速具有较强的可靠性。参数敏感性分析结果表明,地质体热扩散率和地表温度均对地温计算结果产生较明显的影响,参数的准确率定对利用地温计算地下水流速十分重要。In order to construct the technical system of groundwater velocity calculation using heat Abstract:A least square solver was presented for groundwater flux estimation in one-dimensional conduction advection equation solved numerically with MacCormack scheme.This approach was utilized to estimate the groundwater fluxes of the observed borehole under the effect of ground surface temperature (GST) in both rural and urban areas in Leizhou Peninsula,China.The estimated average groundwater recharge rate is 0.796 m/a,while the average discharge rate is 0.269 m/a.The groundwater recharges occur in the north part of the study area;while the discharges occur near Nansan,Donghai and Luzhou Islands,which fit favorably with the local groundwater flow pattern.Relatively high correlations and low RMSE were detected between the observed and computed borehole temperaturedepth profiles,indicating that the estimation is reasonable.The sensitivity analysis of surface temperature and thermal diffusivity of geological bodies and GST indicates that the evaluation of subsurface heat island effects is very important for improving the precision of groundwater flux estimation by using borehole temperatures.

关 键 词：温度示踪 地下水流速 地表暖化 数值解 雷州半岛 

分 类 号：P641.2[天文地球—地质矿产勘探]