Terraced paddy field rainfall-runoff mechanism and simulation using a revised tank model |
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Authors: | Rong-Song Chen Kuo-Hsien Yang |
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Institution: | (1) Department of Civil Engineering, National Chung-Hsing University, Taichung City, Taiwan |
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Abstract: | Terraced paddy fields play important roles in water and soil conservation because their water storage effect reduces and delays
flood peaks. This study applies the terraced paddy field rainfall-runoff mechanism to the tank model. Though the traditional
four-section tank model can easily simulate rainfall-runoff in a terraced paddy field, it has many parameters that are difficult
to calibrate. To address the shortcomings of the traditional four-section tank model, this study develops a revised tank model
to simulate rainfall-runoff. This study selects a terraced paddy field located in Hsuing-Pu village in Hsiuing-Chu County
as the experimental field. The field under investigation was equipped with automatic monitoring stations, water-stage, and
rain gauges. These stations collected data on rainfall and water flow to simulate the rainfall-runoff model in that region.
To simulate the runoff behavior of the experimental terraced paddy field, two rainfall events were selected from the gathered
data and five normal evaluation indexes based on static and hydrological theory were applied to calculate the results of simulation
simultaneously. The revised tank model performed better than expected, and precisely predicted the variations and trends in
flow charge. Comparison with representation indexes proved that the revised tank model is an appropriate and valuable tool
for rainfall-runoff simulation. |
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