Identification of the composite parameters of the BBH-B model specifying the effects of biohydrologic processes on the water balance of crop fields |
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Authors: | Tetsuo Kobayashi Junichi Teshima Makito Mori Daisuke Yasutake Weizhen Wang Hiroyuki Cho |
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Institution: | (1) Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan;(2) Kyushu Branch, Japan Weather Association, Fukuoka 810-8511, Japan;(3) Faculty of Agriculture, Kochi University, Nankoku 783-8502, Japan;(4) Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou, 720000, China;(5) Departmernt of Agricultural Sciences, Saga University, Saga 840-8502, Japan |
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Abstract: | A model of soil hydrology incorporating rainfall interception and macropore flow, which are representative biohydorologic
processes, (BBH-B model) has two composite parameters, Π and Φ. These parameters express the ratios of rainfall interception and macropore flow to gross rainfall, respectively. Their values,
however, change widely with the vegetation, soil texture and wetness. The results of experiments that have been carried out
for various objectives under various conditions by the present authors were reanalyzed to evaluate these two parameters. Further,
two supplemental experiments were designed to identify the two parameters. In the experiments, the monthly mean of Π for a cornfield ranged from 0.18 to 0.64 in the summer months, while Φ for a weed-grown field reached a maximum of 0.8 when daily rainfall was more than 40 mm day−1. From these analyses and experiments, we concluded that the effects of biohydrologic processes on the water balance of crop
fields are rather large and not negligible. |
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Keywords: | BBH model biohydrologic process evapotranspiration macropore flow rainfall interception water balance |
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