Deformation of Trees in Hawaii and its Relation to Wind

(1) The reliability of the use of wind-deformed trees as indicators of wind direction and magnitude was examined at 590 sites in Hawaii, where the NE tradewind is persistent throughout the year. (2) The consistency in magnitude and direction of tree-deformation shown by individual trees of the same and of different species at a given site was studied. (3) After adjustments had been made for five notably wind-resistant or windsensitive species, observations on the fifteen most frequently encountered species were used to delineate estimated wind patterns for the islands of Oahu and Maui. (4) Comparison of the wind patterns based on the observation of wind-deformed trees with those based on instrumental observations showed a reasonable agreement; any discrepancies were probably attributable to the differences in the periods of time represented by the data on which the maps were based.

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