• A Modification of Water Table Fluctuation Model Considering Delayed Drainage Effect of Unsaturated Zone
  • Kim, Seong-Han;Park, Eun-Gyu;Kim, Yong-Sung;Kim, Nam-Jin;
  • HNS Engineering Inc.;Department of Geology, Kyungpook National University;Yooshin Engineering Corporation;Department of Geology, Kyungpook National University;
  • 비포화대 지연배수 효과를 고려한 지하수위 변동모델의 개선 및 적용
  • 김성한;박은규;김용성;김남진;
  • 한서엔지니어링;경북대학교 지질학과;(주)유신;경북대학교 지질학과;
Abstract
Recently, a physically based model of water-table fluctuation due to precipitation is developed based on aquifer water balance model. In the model, it was assumed that the water infiltration into ground surface is advection dominant and immediately reaches to water-table. The assumption may be suited for the sites where the water-table is shallow and/or the permeability of the unsaturated zone is high. However, there are more cases where the model is not directly applicable due to thick and low permeable unsaturated zone. For the low permeability unsaturated zone, the pattern of water flux passing through unsaturated zone is diffusive as well as advective. In this study, to improve the previously developed water-table fluctuation model, we combined the delayed drainage model, which has long been used in well hydraulics, to the water-table fluctuation model. To test the validity of the development, we apply the developed model to 5 different domestic sites. The model parameters are calibrated based on the groundwater hydrograph and the precipitation time series, and the correlation analyses among the parameters are pursued. The overall analyses on the delineated model parameters indicate that the delayed drainage parameters or delay index used in the developed model are able to reveal drainage information in the unsaturated zones.

Keywords: Water-table fluctuation;Delayed drainage;Unsaturated zone;Recharge rate;Water-table fluctuation model;

This Article

Correspondence to

  • E-mail: