HR: 0800h
AN: H11C-1272    [Abstracts]
TI: Applicability of Minimum Entropy Deconvolution to the Estimation of Relative Recharge considering the Spatial Relationship between Sampling Points and Recharge Area
AU: * Kim, T
EM: katzura@kigam.re.kr
AF: KIGAM, Gajeong-dong 30, Yuseong-gu, Daejeon, 305-350 Korea, Republic of
AB: Kim and Lee (2005) suggested Minimum Entropy Deconvolution (MED) as the new approach to the sequential estimation of recharge. In the referred study, the various cases, such as spatial heterogeneity of recharge and sampling interval, did not investigated. The assigned recharge rate was considered to be homogeneous in space. But, in actual situations, recharge can be occurred with the high spatial heterogeneity. Groundwater level at some points can be instantaneously influenced by recharge or rainfall. But, in other cases, it can takes long time that recharge make some influence on the groundwater level. This difference is due to the various causes; hydraulic properties, vertical depths of groundwater tables from the ground surface, temporal sequences of rainfall and so forth. In this study, the extended investigation on the applicability of MED to the estimation of the relative recharge sequence considering the spatial relationship between sampling points and recharge areas. For the purpose of this study, the groundwater level data were synthesized through the numerical simulations. One of two models is assumed to be homogeneous, to investigate the applicability of MED along with the increase of the distance between the sampling points and recharge area. And another one is conceptualized with the random field of hydraulic conductivity, to approximately describe the real situation. From the results from the numerical simulations, the relative sequences of recharge rates were estimated with MED. In homogeneous case, every sampling point has the high cross-correlation, more than 0.8, with the original sequence of recharge. And the cross-correlations in the random field of hydraulic conductivity are mostly higher than 0.8. But the lengths of filters are slightly increased along with the distance from the recharge area.
DE: 1849 Numerical approximations and analysis
DE: 1872 Time series analysis (3270, 4277, 4475)
DE: 1876 Water budgets
DE: 1894 Instruments and techniques: modeling
SC: Hydrology [H]
MN: Fall Meeting 2005