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[E-3.2 Quantification of Hydrological Processes in Tropical Forests]

[Contact Person]

Makoto Tani
Chief, Forest Meteorology Laboratory
Forest Environment Division
Forestry and Forest Products Research Institute
P.O.Box 16, Tsukuba Norin Kenkyuu Danchi-Nai, Ibaraki 305 Japan
Phone +81-298-73-3211(Ext.384), Fax +81-298-74-3720

[Total Budget for FY1990-1992]

13,641,000 Yen

[Abstract]

　Field investigations were carried out at a small forested experimental catchment in Peninsular Malaysia to quantify hydrological processes in tropical forests. The following findings were obtained. 1) Rainfall was characterized by the high intensity and the short continuance, and most rainfall events occurred in the afternoon. 2) The structure of soil mantle on a hillslope consisted of a relatively uniform surface layer and weathered rock the thickness of which was widely ranged. 3) The soil permeability within surface layer decreased with depth according to the decrease of soil pore. 4) When the soil moisture condition of hillslope was wet, rain water was infiltrated rapidly into depper soil and the ground water level was found during the storm event at one of the monitoring points. When it was dry, the infiltration was slow and the size of storm hydrograph was very small, but as the soil condition is getting wet, the storm hydrograph \vas bigger and the gradient of its recession limb became gentler.

[Key Words]

Tropical Forest, Water Balance, Experimental Watershed, Hillslope Hydrology, Surface Soil