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Streamflow prediction in ungauged catchments by using the Grunsky method

International Soil and Water Conservation Research 2023年第4期11卷 700-712页

作者： Bruno K.Marchezepe AndréAlmagro AndréS.Ballarin Paulo Tarso S.Oliveira Department of Hydraulics and Sanitary Engineering São Carlos School of EngineeringUniversity of São PauloSão CarlosSPBrazil Faculty of Engineering Architecture and Urbanism and GeographyFederal University of Mato Grosso do SulMS79070-900Brazil

Establish a reliable rainfall-runoff relation capable of predicting runoff in ungauged basins is a matter of interest across the world for a long time and has been taking importance during the past *** approaches,hydrological models and machine learning techniques have been used to estimate ***,returning some simplicity to the predictions might be necessary for practical *** this paper,we re-introduce *** approach,developed in the early 1900s to predict runoff from values of precipitation on a two-equations ***,we analyze the Grunsky generalized method applied for 716 Brazilian catchments,on an interannual and monthly ***,we established the best method to find the rainfall-runoff relation coefficient for each ***,we evaluate the performance of the method on a local scale,i.e.,catchment by ***,we analyze the method of regionalization,by grouping the catchments into six hydrologically similar *** local scale,the Kling-Gupta Efficiency(KGE)values range from 0.87 to 0.93 on the interannual scale and is greater than 0.50 on the monthly *** the regionalized approach,KGE varies from 0.60 to 0.84 on an interannual *** also found suitable KGE values on a monthly scale,with more than 22%of catchments with KGE greater than 0.50,being the best performances in the Non-seasonal and Extremely-wet groups,and the worst performance in the Dry *** findings indicate that Grunsky approach is suitable to predict streamflow for Brazilian catchments on interannual and monthly *** simple and easy-to-use equation presents a reliable alternative to more complex methods to compute runoff by only using rainfall data.

关键词： Regionalization Hydrological group Temporal scale tropical basins

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