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| DOI： |
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| Investigating Effective Rainfall and Factors Affecting Effective Rainfall Using Experiments and Modelling |
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CHEN Junke, JIAO Xiyun, ZHUANG Yang, GUO Weihua
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College of Water Conservancy and Hydropower Engineering，Hohai University, Nanjing 210098, China ; State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; The Management Office of the City Flood Control Engineering in Changzhou, Changzhou 213017, China
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| Abstract: |
| This paper analyzed the maximum holding capacity of water by soil, rainfall intensity and effective rainfall (portion of a rainfall staying in root zone) based on rainfalls and soil water content profiles measured at Nanpi Agro-ecological Experimental Station in Cangzhou from 2011 to 2013. The interception of rainfalls by canopy at different growing periods was calculated using leaf area and leaf index. A quantitative relationship between the effective rainfall and rainfall was proposed. The results showed that the initial soil water content was linearly correlated to the effective rainfall. In the absence of surface runoff, the maximum holding capacity of water by soil could be used as a threshold of whether a reduction in initial water content should be considered. In addition, when rainfall intensity was higher than 0.7 mm/min, the correlation between rainfall intensity and effective rainfall was significant, and with the increase in maximum rainfall intensity, the effective rainfall decreased. Comparing the effective rainfall calculated using the traditional model and the proposed model with the measured results showed that the proposed model was more accurate, especially for large rainfalls. |
| Key words: rainfall; interception by canopy; rainfall intensity; initial soil water content; effective rainfall model |
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