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The importance of discharge measurement in river basins is more increasing with requiring domestic, industrial and agricultural water demand as population and industrialization.Rating curves was developed at 6 gauging stations in South Han river system.The HEC-RAS model is applied for hydraulic modeling in gauging stations.The model is designed to perform one-dimensional hydraulic calculations for an river improvement plan in a full network of natural and constructed channels, and is comprised of a graphical user interface(GUI), separate hydraulic analysis components, data storage and management capabilities, graphics and reporting facilities
For the flood disaster analysis of the Yogak valley sustained much flood damage from June 30, 1994 to July 1, hydrologic analysis is carried out. In this analysis, models of rainfall frequency analysis are classified to following models : Two-Parameter Lognormal, Three-Parameter Lognormal, Pearson Type III, Log-Pearson Type III and Extremal Type I distribution. SCS curve number method is used at the estimation of excess rainfall. Muskingum model is used at the channel routing. Rational formula, Modified Kajiyama, Clark and SCS model are applied at the rainfall-runoff analysis in subbasins.
For the flood runoff analysis of mountainous small basins, hydrologic analysis is carried out, and analysis area is the Yogak valley basin in Chungju City sustained much flood damage from June 30, 1994 to July 1. In analysis, SCS curve number method is used at the estimation of excess rainfall. Clark model and SCS model is applied at the rainfall-runoff analysis in sub-basins, and Muskingum model is used at the channel routing.
This study aims at the calculation of river hydraulic characteristics which need to a stream improvement plan in the lower reach of Yodo stream. For rainfall-runoff analysis, probable rainfall is estimated by the frequency factor method,and effective rainfall is calculated by the SCS method. Probable flood discharge is calculated by the area-routing method at Yodo stream estuary. The HEC-2 model was used to calculate water surface profiles for steady, gradually varied flow,and was estimated the effects on water surface profiles of channel improvement and levees as well as the presence of bridges or other structures in the floodplain at Yodo stream by the model.
The purpose of this study is to propose a model of computing storm water runoff from small urban drainage areas in Korea. To simulate the mechanism of runoff in small urban watersheds, the ILLUDAS(Illinois Urban Drainge Area Simulator) model and the Rational Formula were used in this study. The Rational Formula can be used only for computing peak discharges in small urban areas. the transferability of ILLUDAS model to Korean small watersheds and significant factors that could affect its application were examined through the analysis of the hydrographs generated from runoff simulations, and ILLUDAS model was selected as fit model to be applied to small urban areas.
The HEC-RAS model is applied to calculate hydraulic characteristics in the lower reach of Dong river dam from Youngweol 2 station to Geoun bridge. The model is designed to perform one-dimensional hydraulic calculations for an environment improvement plan in a full network of natural and constructed channels, and is an integrated system of software, designed for interactive use in a multi-tasking, multi-user network environment. The system is comprised of a graphical user interface(GUI), separate hydraulic analysis components, data storage and management capabilities, graphics and reporting facilities. The model provides several added capabilities including the option to import and utilize three-dimensional(3-D) river reach and cross sectional data from a data exchange file.
The design and operation of water resource systems are affected to a great extent by the uncertainty of future events. When water was supplied under uncertainty, the analysis of water economics on the optimal alternatives was carries out by applying Dynamic Programing and bayesian Decision theory. Improved TPM model was applied in the determination of the relationship of reservoir storage, wafer supply and probability.
The purpose of this study is to improve the present methodology for the stochastic determination of storage capacity of an impounding reservior. TPM model presented in this paper is belived to be rational in that probabilities of reservior is to disigned for various water supply rates, or storage capacities. The monthly flow are used to derive reservior capacity-yield-probability curves at Norumok gauging station in Talchon river basin.
This study aims at the hydraulic examination of Taejeon stream conveyance by HEC-2 model. HEC-2 model used in this study is developed for calculating water surface profiles for steady and gradually varied flow in natural or man-made channels. The data needed to perform these computations inculde flow regime, starting elevation, discharge, loss coefficients, cross section geometry and reach lengths in Tajeon stream. The computational procedure is based on the solution of the one-dimensional energy equation with energy loss due to friction evluated with Manning's equation. The model will be used for application in floodplain management and water quality modeling. Also, capabilities are available for assessing the effects of channel improvements and levees on water surface profiles.