Estimation of Design Flow in Ungauged Basins by Regionalization
نویسندگان
چکیده
Estimating design flow in ungauged basins is a task frequently encountered in the design and planning of hydraulic and water resources engineering. Regionalization is a way to deal with this issue. In this study, a regional formula for peak flows was established using gauged flows and basin topographic characteristics in order to estimate the design flows in ungauged areas within the homogeneous region. At first, principal component and cluster analyses were used to classify the small sub-basins, delineated by this work, in Western Taiwan into three homogeneous regions. Due to the limitation of data availability and the region characteristics, only two homogeneous regions, Region 1 and Region 2, were used to build regional design flow formulae, but Region 3 is excluded from this study. The regional formula with respect to the area crossing Regions 1 and 2, named Crossing Region, and the formula regarding all regions, named Whole Region, were established to assess the performance of the proposed regionalization method. Crossing Region indicates that the catchment of a station in Region 1 encompasses both areas of Regions 1 and 2. Therefore, Region 1 means that a station in Region 1 encloses a catchment area only in Region 1. Whole Region is a combination of Regions 1 and 2.
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