Relationships between rainfall, fog and throughfall at a hill evergreen forest site in northern Thailand
✍ Scribed by Nobuaki Tanaka; Koichiro Kuraji; Chatchai Tantasirin; Hideki Takizawa; Nipon Tangtham; Masakazu Suzuki
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 258 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0885-6087
- DOI
- 10.1002/hyp.7729
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✦ Synopsis
This study used hourly data of rainfall, water captured by a sheltered fog gauge and wind speed as collected at a montane forest site in northern Thailand during nearly 3 years to test the efficiency of the rain-protected passive fog gauge as a predictor of fog occurrence. To separate possible contributions by wind-driven rain (WDR) from fog, the maximum rate of water input to the fog gauge during rainless periods (Fog max ) was derived as a function of wind speed. During periods with rain and fog, the fog gauge often produced values above the Fog max line, suggesting contributions by WDR. The specific conditions of rainfall intensity and wind speed under which this happened were identified and the corresponding data were excluded from the fog data-set for subsequent reanalysis. Based on the recalculated data-set, inter-annual and seasonal variations as well as the diurnal pattern of fog occurrence at the studied forest are described. Fog-induced canopy drip during rainless periods was only 19Ð3 mm over the 3 years, being less than 0Ð5% of total throughfall and ¾33% of the corresponding catch by the fog gauge (58 mm). However, the fog gauge captured nearly 18 times more water (1033 mm) during all times when WDR could reasonably be excluded.