Comparison of methods for measuring woody riparian vegetation density
| Autor: | J. Craig Fischenich, Syndi J. Dudley, Steven R. Abt, Charles D. Bonham |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Hydrology
Willow geography geography.geographical_feature_category Ecology biology Water flow Flow (psychology) Soil science Vegetation Flow direction biology.organism_classification Salicaceae Drag Environmental science Ecology Evolution Behavior and Systematics Earth-Surface Processes Riparian zone |
| Zdroj: | Journal of Arid Environments. 38:77-86 |
| ISSN: | 0140-1963 |
| DOI: | 10.1006/jare.1997.0314 |
| Popis: | Flow resistance caused by vegetative drag depends on vegetation density (Veg d ), the area of vegetation projected onto a plane perpendicular to the flow direction per unit volume of flow. However, research concerning the accuracy and efficiency of field measurement of Veg d for hydraulic investigations is limited. Measurements were conducted at two willow stands with different Veg d using the horizontal point frame (HPF), board, and camera methods. Results obtained with the HPF method were considered accurate and used as a standard with which to compare the performance of the board and camera methods. It was concluded that the board method: (1) was the most rapid of the three; (2) tends to underestimate Veg d ; and (3) performed better in sparse willows than dense willows. The camera method: (1) required less time than the HPF; (2) tends to underestimate Veg d ; and (3) performed better in dense willows than sparse willows. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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