Article
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Block Kinematic Wave, A Novel Rainfall-Runoff Model For Small Urban Catchments
Version 1
: Received: 26 January 2024 / Approved: 26 January 2024 / Online: 26 January 2024 (10:49:32 CET)
How to cite: Lin, Y.-T.; Lee, T.-H. Block Kinematic Wave, A Novel Rainfall-Runoff Model For Small Urban Catchments. Preprints 2024, 2024011892. https://doi.org/10.20944/preprints202401.1892.v1 Lin, Y.-T.; Lee, T.-H. Block Kinematic Wave, A Novel Rainfall-Runoff Model For Small Urban Catchments. Preprints 2024, 2024011892. https://doi.org/10.20944/preprints202401.1892.v1
Abstract
BKW is a highly efficient Storage Function-type rainfall-runoff model that utilizes the steady-state storage (S) and outflow (Q) of a catchment at different rainfall intensities as the S-Q relation of the catchment. For the inundation nowcasting of urban areas under high-intensity, short-duration rainfall, a Storage Function-type model is a judicious choice. However, S-Q hysteresis exists in the catchment S-Q relation, and BKW is unable to exhibit hysteresis due to assuming that the S-Q relation of a catchment is a nonlinear relation. The S-Q hysteresis can influence the outflow estimation of BKW, reducing the model's accuracy. Through the evaluation of analytical solutions, we found that the change in rainfall intensity dominates the S-Q relation of a catchment. The S-Q relation during a rainfall event is a dynamic process rather than a monotonic nonlinear relation. By applying the dynamic S-Q relation in BKW, we improved BKW to become a highly efficient and accurate rainfall-runoff model for small urban catchments.
Keywords
rainfall-runoff; hysteresis; afternoon thunderstorm; short-duration high-intensity rainfall; Storage Function; kinematic wave; analytical solution; urban runoff; inundation; flood nowcasting
Subject
Engineering, Civil Engineering
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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