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Threshold for initiation of motion of unimodal and bimodal sediments

International Journal of Sediment Research 2013年第1期28卷 24-33页

作者： Shaileshkumar B.PATEL Prem Lal PATEL prakash devidas porey Water Resources Engineering CEDSardar Vallabhbhai National Institute of TechnologySurat-395007India Department of Civil Engineering Sardar Vallabhbhai National Institute of TechnologySurat-395007India Sardar Vallabhbhai National Institute of Technology Surat-395007India

Experimental data,obtained from previous studies,on Critical Tractive Stress(CTS) of non-uniform sediments, have been used to verify the adequacy of existing relationships for CTS of non-uniform bimodal *** in view the performance of such relationships,a new relationship for computation of dimensionless CTS of individual size fraction of non-uniform unimodal and bimodal sediments has been proposed in the form of power *** coefficient and exponent of the proposed power law have been empirically correlated with sediment characteristics for available sediment *** proposed relationship has been validated with independent flume and field data to assess their applicability for unimodal and bimodal sediments.

关键词： Bimodal Critical tractive stress Non-uniform sediment Scaling size Unimodal

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Calibration of HEC-RAS Model on Prediction of Flood for Lower Tapi River, India

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Journal of Water Resource and Protection 2011年第11期3卷 805-811页

作者： Prafulkumar V. Timbadiya Prem Lal Patel prakash D. porey 不详

Channel roughness is a sensitive parameter in development of hydraulic model for flood forecasting and flood inundation mapping. The requirement of multiple channel roughness coefficient Mannnig’s ‘n’ values along the river has been spelled out through simulation of floods, using HEC-RAS, for years 1998 and 2003, supported with the photographs of river reaches collected during the field visit of the lower Tapi River. The calibrated model, in terms of channel roughness, has been used to simulate the flood for year 2006 in the river. The performance of the calibrated HEC-RAS based model has been accessed by capturing the flood peaks of observed and simulated floods;and computation of root mean squared error (RMSE) for the intermediated gauging stations on the lower Tapi River.

关键词： Hydrodynamic Model Calibration Simulation Flood and Stage Hydrograph Validation HEC-RAS

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Calibration of HEC-RAS Model on Prediction of Flood for Lower Tapi River, India

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Journal of Water Resource and Protection（水资源与保护） 2011年第11期 805-811页

作者： Prafulkumar V. Timbadiya Prem Lal Patel prakash D. porey

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