水文地质工程地质2026，Vol.53Issue(3)：21-32,12.DOI:10.16030/j.heg.202601021
利用直推式点状注水试验刻画松散含水层渗透系数的垂向变化
Characterizing the vertical variations of hydraulic conductivity of an unconsolidated aquifer based on the direct-push point-source injection tests
摘要
Abstract
Hydraulic conductivity(K)and its spatial variability are critical factors governing groundwater flow and solute transport processes.Traditional methods,such as pumping tests and slug tests,often treat the aquifers as homogeneous to derive equivalent K values,making it difficult to accurately characterize the aquifer medium's intrinsic spatial heterogeneity.Recently,the direct-push point-source injection test method,relying on casing-free direct advancement technology,enables rapid and high-resolution point-source injection through one miniature screen on the side of the probe.However,the interpretation of data from this type of tests currently relies primarily on one empirical model,and the accuracy and reliability of its estimates lack systematic evaluation.This study selected the North Campus Research Site(NCRS),a typical unconsolidated aquifer,to comparatively evaluate the differences between the site-specific model and the traditional empirical model in quantitatively estimating hydraulic conductivity.The estimation effectiveness of the point-source injection test,soil permeameter tests,and slug tests across layers with different hydraulic conductivities was analyzed and discussed.Furthermore,a numerical model was used to quantitatively analyze the impact of hydraulic conductivity estimates from different methods on simulated injection water level dynamics.This study indicates that the high-resolution response data from the direct-push point-source injection tests can qualitatively indicate vertical variations in aquifer media permeability.The traditional empirical model can lead to significant overestimation or underestimation of hydraulic conductivity,whereas the site-specific model can effectively improve estimation accuracy.Compared to permeameter tests and slug tests,the point-source injection test can provide hydraulic conductivity estimates more conveniently and efficiently.However,for low-permeability layers,its estimates still lead to deviations in simulating injection water levels.Overall,the direct-push point-source injection tests have great potential to provide high-resolution hydraulic conductivity information,offering crucial hydrogeological parameter support for investigating heterogeneous unconsolidated aquifers and constructing high-precision three-dimensional models.关键词
直推式点状注水试验/松散非均质含水层/渗透系数/经验模型/场地拟合模型Key words
direct-push point-source injection tests/unconsolidated aquifers/hydraulic conductivity/empirical model/site-specific model分类
天文与地球科学引用本文复制引用
赵占锋,宋献方..利用直推式点状注水试验刻画松散含水层渗透系数的垂向变化[J].水文地质工程地质,2026,53(3):21-32,12.基金项目
国家自然科学基金项目(41807202) （41807202）
国家自然科学基金重点项目(41730749) （41730749）
