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DTSTART:20041031T030000
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RDATE:20051030T030000
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DTSTAMP:20260823T085858Z
DESCRIPTION:Surface water and groundwater ecosystems are linked components 
 of a hydrologic continuum leading to related sustainability issues. The in
 teractions between surface water and groundwater are highly complex in nat
 ure. The research activities in this area have proliferated during the 199
 0s\, with a major focus on hydrological and biogeochemical processes. Howe
 ver\, a broader perspective of such interactions is required to better und
 erstand the intricate processes involved\, which in turn can ensure sustai
 nable water resources management.  \n\nAdequate knowledge of aquifer param
 eters is of utmost importance for the efficient management of groundwater 
 basins. There are many methods for finding out aquifer parameters such as 
 the pumping test data analysis\, grain-size analysis\, floodwave-response 
 technique\, tidal response technique\, and numerical modeling. Under suita
 ble field conditions\, it is possible to calculate the hydraulic diffusivi
 ty (ratio of aquifer transmissivity to storage coefficient) of an aquifer 
 system by analyzing its response to river stage fluctuations\, which is kn
 own as the floodwave-response technique. A field study was carried out in 
 the Konan groundwater basin of Kochi Prefecture\, Japan to investigate the
  river-aquifer interaction process. Using the field-observed hydrogeologic
  data and the river-stage data of a perennial river system\, an inverse-mo
 deling analysis was performed to explore the practicability and reliabilit
 y of the floodwave-response technique (also known as ±river-aquifer intera
 ction technique²) in estimating the hydraulic parameters of the Konan aqui
 fer. The analysis of the pertinent hydrologic and hydrogeologic data revea
 led a strong relationship between the river stage and the groundwater leve
 ls over a major portion of the basin. Based on this finding\, suitable riv
 er hydrographs and well hydrographs were selected for the aquifer paramete
 r estimation using the floodwave-response model. The results of inverse mo
 deling indicated high values of aquifer diffusivity at 4 sites ranging fro
 m 16 to 194 m2/s. However\, the overall average aquifer diffusivity was fo
 und to be reasonable (0.7-3.5 m2/s). All the selected flood events were no
 t found suitable for determining reasonable values of hydraulic diffusivit
 y at individual sites. Furthermore\, using the optimal diffusivities at tw
 o sites and the aquifer transmissivity from the pumping tests at these sit
 es\, the storage coefficient values were estimated as those of truly confi
 ned aquifers. In contrast\, reasonable values of storage coefficient were 
 obtained based on the average diffusivity estimates. A sensitivity analysi
 s of the floodwave-response model indicated that the optimal hydraulic dif
 fusivity is very sensitive to the distance parameters of the model. It is 
 concluded that a judicious application of the floodwave-response technique
  is essential for obtaining reliable estimates of hydraulic diffusivity\, 
 particularly in the case of phreatic aquifer systems.
DTSTART;TZID=Europe/Berlin:20050519T161500
DTEND;TZID=Europe/Berlin:20050519T235959
LOCATION:H6
SUMMARY:Prof. Dr. Madan Jha\, Indian Inst. of Technology\, Kharagpur und Hu
 mboldt-Stipendiat am LS Hydrologie: Surface Water-Groundwater Interaction:
  Key to Sustainable Management of Water Resources Systems
TRANSP:TRANSPARENT
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