Abstract:

The interception process of forest canopy is very important to water cycle of forest. Most studies have considered the relationship between the interception in one or several rainfall events and precipitation without thinking of the rainfall density and the characters of vegetation, and therefore few study results can be used in distributed rainstorm-runoff model. By taking some simulation experiments in the lab, data of interception process in unattached events with different rainfall density and leaf area index were got. Based on the data, the relationship between rainfall density and maximum interception per unit leaf area index is quantified. The changing of interception ratio with wetness degree of canopy is also identified. An interception model using rainfall density and leaf area index as parameters is constructed with the consideration of canopy wetness degree. With the validation experiment, the precision of the model is 92.7%.

Key words: interception, rainfall distribution, model, rainfall density, leaf area index