HR: 0800h
AN: H21A-1320    [Abstracts]
TI: Surface Water Assessment and Hydrologic Modeling under Karst Aquifer Conditions
AU: * Viswanathan, C
EM: chand@engr.uky.edu
AF: Kentucky Water Resources Research Institute, 233 Mining and Minerals Building, University of Kentucky, Lexington, KY 40506 United States
AU: Teegavarapu, R S
EM: ramesh@engr.uky.edu
AF: Kentucky Water Resources Research Institute, 233 Mining and Minerals Building, University of Kentucky, Lexington, KY 40506 United States
AU: Ormsbee, L
EM: lormsbee@engr.uky.edu
AF: Kentucky Water Resources Research Institute, 233 Mining and Minerals Building, University of Kentucky, Lexington, KY 40506 United States
AB: Hydrology calibration of a watershed with karst aquifer condition is attempted in this research study. To model the karst conditions, specific data relevant to sink holes, discharge through them along with surface flow, are essential. Hydrology calibration of such watershed is a challenging task. In this study an iterative approach using HSPF modeling is used to perform hydrology calibration for a watershed with karst conditions. Unlike ordinary confined or unconfined aquifers, the karst aquifers are mostly huge tunnels which carry water more rapidly. This research study proposes a simple approach for handling karst aquifer conditions while performing the hydrology calibration to facilitate water quality management studies. Hydrologic simulation model, HSPF is used for modeling this watershed. In the initial phase, the watershed is modeled under non-kasrt conditions. After simulating the watershed rainfall-runoff model in non-karst conditions, sink holes are introduced in the HSPF model and using an expert system knowledge base, water is extracted out of the system to simulate the karst flow conditions. After satisfactory calibration under non-karst conditions is achieved, sink holes are introduced at mouth of the watershed to match the karst conditions. The methodology is applied to a case study region, Cane Run watershed, in Fayette county, Kentucky that has large karst aquifer conditions. This watershed is in the Inner Blue Grass physiographic region and is a part of 8 digit USGS HUC # 05100205 draining 29,152 acres. Due to karst topography and existence of large number of sink holes, the observed streamflows exhibit high temporal variability. Two USGS gauging stations observations are used for the analysis. This approach facilitates simulation of the natural conditions in watersheds with karst conditions for proper water quality modeling and planning different management strategies.
DE: 1719 Hydrology
DE: 1884 Water supply
SC: Hydrology [H]
MN: Fall Meeting 2005