Articles | Volume 7, issue 2
Hydrol. Earth Syst. Sci., 7, 245–253, 2003

Special issue: The Dooge-Eagleson Symposium, EGS-AGU-EUG Joint Assembly,...

Hydrol. Earth Syst. Sci., 7, 245–253, 2003

  30 Apr 2003

30 Apr 2003

First evidence of a structured and dynamic spatial pattern of rainfall within a small humid tropical catchment

K. Bidin1 and N. A. Chappell2 K. Bidin and N. A. Chappell
  • 1School of Science and Technology, University Malaysia Sabah, 88999 Kota Kinabalu, Sabah, Malaysia
  • 2Institute of Environmental and Natural Sciences, Lancaster University, Lancaster LA1 4YQ, UK
  • Email for corresponding author:

Abstract. In a study of the spatial variability of rainfall across a network of 46 raingauges in a 4 km2 rainforest catchment in the interior of northeastern Borneo, seasonal rainfall totals were correlated with raingauge separation distance, aspect and relief. A very high degree of spatial variability in seasonal totals across a very small area was found, even in comparison with other regions experiencing convective rainfall. Moreover, it shows systematic, stochastic structure in rainfall is present over scales of 10s to 100s metres; these patterns change from the southwest monsoon (May-October) to the northeast monsoon (November-April). Local associations with aspect and relief are present but the seasonal changes in rainfall pattern over the whole 4 km2 catchment must relate to more complex local topographic effects on the regional windfield.

Keywords: catchment, Malaysia,monsoon, rainfall, spatial variability