Abstract
The wind characteristics of speed, direction, and vertical profile were studied to determine the effects of undulations in the local topography and canopy surface on flux observations made from a tower in an evergreen forest in Kompong Thom Province, Cambodia. Three seasonal patterns of wind speeds and directions were identified. The first occurred in December and January and was characterized by northerly monsoons that persisted all day, as well as a diurnal variation in wind speed, with a maximum and minimum around noon and near sunset, respectively. A second pattern, in February, was characterized by southerly to westerly prevailing monsoon winds, along with an easterly mountain wind observed in the early morning. Wind speed was low throughout the day. The third pattern was similar to the second but included brief, strong winds associated with squalls. Thus, regional effects on circulation were limited, and monsoon winds were found to dominate the meteorological system above the evergreen forest of central Cambodia. In the forest, the estimated roughness length and zero plane displacement height averaged 18.3 m and 7.5 m, respectively, and the average canopy height was 27.2 m. The dependence of roughness length and zero plane displacement height on the wind direction was within the standard deviation. Thus, the undulating canopy surface had little effect on the tower flux observations.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Arya SP (1988) Introduction to micrometeorology. Academic Press, London
Chang J (1984) The monsoon circulation of Asia. In: Yoshino M (ed) Climate and agricultural land use in monsoon Asia. University of Tokyo Press, Tokyo, Japan, pp 3–34
Hattori S (1985) Explanation on the derivation process for equations to estimate evapotranspiration and problems with their application to forest stands (in Japanese). Bull For For Prod Res Inst 332:139–165
Malhi Y, Nobre AD, Grace J, Kruijt B, Pereira MG, Culf A, Scott S (1998) Carbon dioxide transfer over a Central Amazonian rain forest. J Geophys Res 103D:31593–31612
Morooka T, Kuraji K, Kumagai T, Suzuki M (2002) Characteristics of wind profile and turbulent flow above the tropical rain forest in Lambir National Forest, Sarawak* (in Japanese). Trans Jpn For Soc 113:151
Nakamura R, Mahrt L (2001) Similarity theory for local and spatially averaged momentum fluxes. Agric For Meteorol 108:265–279
Saitoh TM, Kumagai T, Ohashi M, Morooka T, Suzuki M (2005) Nighttime CO2 flux over a Bornean tropical rainforest (in Japanese). J Jpn Soc Hydrol Water Resour 18:64–72
Shimizu A, Nobuhiro T, Kabeya N, Tamai K, Kubota T, Tsuboyama Y (2004) Some observations on evapotranspiration in an evergreen broad-leaf forest watershed, Cambodia. In: Proceedings of the international conference on advances in integrated Mekong River management, Lao PDR, Vientiane 25–27 October 2004, pp 130–136
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2007 Springer
About this paper
Cite this paper
Tamai, K., Shimizu, A., Nobuhiro, T., Kabeya, N., Chann, S., Keth, N. (2007). Measurements of Wind Speed, Direction, and Vertical Profiles in an Evergreen Forest in Central Cambodia. In: Sawada, H., Araki, M., Chappell, N.A., LaFrankie, J.V., Shimizu, A. (eds) Forest Environments in the Mekong River Basin. Springer, Tokyo. https://doi.org/10.1007/978-4-431-46503-4_8
Download citation
DOI: https://doi.org/10.1007/978-4-431-46503-4_8
Publisher Name: Springer, Tokyo
Print ISBN: 978-4-431-46500-3
Online ISBN: 978-4-431-46503-4
eBook Packages: Biomedical and Life SciencesBiomedical and Life Sciences (R0)