Simulation of Gash Model to Rainfall Interception of Pinus tabulaeformis

Wenjun Liang


Aim of study: In order to test the adaptability of revised Gash analytical model to canopy interception of Pinus tabulaeformis plantation, determine local parameters in the model, and analyze the sensitivity of the parameters to the simulated interception.

Area of study: The throughfall experiment has been completed in Hebei province of China during 2010.

Material and methods: During the experiment process, rainfall,throughfall and stemflow were measured and canopy interception was simulated with the revised Gash analytical model.

Main results: The results show that the rate of measured throughfall, stem flow and canopy interception occupied to rainfall were 67.08%, 3.10% and 29.82%. Canopy storage capacity, stem storage capacity and Stemflow partitioning coefficient was 2.68 mm, 1.22mm and 0.03. Evaporation rate varied from 0.01 to 0.37 mm•h-1 and the ratio of evaporation and rainfall (E/R) ranged from 0.01 to 0.19 in rainfall periods.

Research highlights: The revised gash model was able to accurately simulate the weekly canopy interception of Pinus tabulaeformis forest.

Key words: Gash analytical model; Throughfall; Canopy interception; Pinus tabulaeformis plantation.

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DOI: 10.5424/fs/2014232-03410