A quantitative analysis of tracing tests for the Maocun subterranean river basin of Guilin during rainy and dry seasons
HUANG Fen
YIN Weilu
Xiaonong HU
CAO Jianhua
Abstract：This paper selected the typical underground river basin in Maocun village of Guilin,Guangxi for quantitative tracer tests in rainy and dry seasons based on online high-resolution monitoring to depict fine characteristics of groundwater aqueous media.According to the tracer test results and groundwater runoff and distribution characteristics,the Maocun underground river system is divided into Shegengyan and Bian-yan underground river,Dachongli-Beidiping sub-system and Dayanqian sinkholes-Maocun outlet sub-system, which are distributed in upstream and downstream of the Maocun basin,respectively.The experimental tracer study shows that the breakthrough curves (BTC)are featured by steep upward and steep drop pinna-cles,which suggest that the conduits are relatively simple,and have no large turnouts and karst tams devel-oped.Each section of the underground river is generally turbulence which is dominated by convection;the flow velocity and flux in rainy seasons are larger,the average travel time is shorter,and the tracer recovery rates are higher than in dry seasons.The aqueous medium in the middle region is relatively uniform,and has no conduit developed.Groundwater is mainly stored in karst cracks.
Keywords：karst subterranean rivertracing testconduit texturehydraulic parameterGuilin Maocun
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 648-658 )