Home | My Profile | Contact Us
Research Trends Products  |   order gateway  |   author gateway  |   editor gateway  
ID:
Password:
Register | Forgot Password

Author Resources
 Author Gateway
 Article submission guidelines

Editor Resources
 Editor/Referee Gateway

Agents/Distributors
 Regional Subscription Agents/Distributors
 
Trends in Heat & Mass Transfer   Volumes    Volume 1 
Abstract
Transport characteristics just above and within crop canopies
Adrie F. G. Jacobs
Pages: 17 - 31
Number of pages: 15
Trends in Heat & Mass Transfer
Volume 1 

Copyright © 1991 Research Trends. All rights reserved

ABSTRACT
 
In the past decade, special attention has been focussed on within-canopy and just above-canopy processes of heat, momentum and mass. Within canopies it appeared that various existing canopy models show contradicting results mainly due to lack of experimental results. That is why our research has been concentrated for a great deal on gathering within-canopy and just above-canopy data sets in order to obtain experimental evidence of high quality to verify canopy models. Attention has been given to estimate surface characteristics (roughness length and displacement height). It appeared that Goudriaan`s (1977) first-order closure model as well as Shaw and Pereira`s (1982) second-order closure model yield useful insight into the physical mechanism of these surface characteristics. The within-canopy flow is complex, highly turbulent and spatially very variable. Hardly any systematic experimental data, however, is available about this particular flow. That is why much effort has been given to measure the spatial variability of physical quantities within and just above a canopy. Results on this issue have been reported here briefly. In agriculture, in the past as well as nowadays, the phenomenon of dew formation, the consequent leaf wetness duration has been given much attention. We contributed to this issue by estimating experimentally dew profiles within a plant canopy. In our canopy it appeared that these profiles show similar shape for various dew events. This result suggests that it is likely to assume here that these similarity profiles are a consequent of the more or less constant foliage area distribution of a plant canopy during a growing season.
Buy this Article


 
search


E-Commerce
Buy this article
Buy this volume
Subscribe to this title
Shopping Cart

Quick Links
Login
Search Products
Browse in Alphabetical Order : Journals
Series/Books
Browse by Subject Classification : Journals
Series/Books

Miscellaneous
Ordering Information Ordering Information
Downloadable forms Downloadable Forms