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dc.contributor.authorCampbell, David I.en_US
dc.contributor.authorWilliamson, J. L.en_US
dc.date.accessioned2008-03-19T05:08:00Z
dc.date.available2007-05-08en_US
dc.date.available2008-03-19T05:08:00Z
dc.date.issued1997-06-01en_US
dc.identifier.citationCampbell, D.I., & Williamson, J.L. (1997). Evaporation from a raised peat bog. Journal of Hydrology. 193(1-4), 142-160.en_US
dc.identifier.urihttps://hdl.handle.net/10289/197
dc.description.abstractEvaporation rates were measured for an oligotrophic raised peat bog dominated by the restionaceous rush Empodisma minus (Hook. f.) Johnson and Cutler in northern New Zealand. Evaporation rates were smaller than those found for other wetlands, ranging between 0.06-0.16 mm h−1 during the daytime, and the average latent heat flux accounted for only 23% of net radiation. Daily average evaporation was only 34% of the Penman potential open water rate, yet the soil was permanently close to saturation. Bowen ratios in the range 3-5 indicate that available energy is primarily partitioned into sensible heat by the dense plant canopy. Bowen ratios in this range are normally associated with semi-arid zone climates rather than with a permanently moist raised peat bog. According to the Penman-Monteith model, the conservative evaporation regime at this site is due to a very large canopy resistance, with daily averages in the range 150-608 s m−1 when the canopy is dry. This large canopy resistance is probably the result of plant responses to a nutrient-poor environment, combined with the effect of an extremely dense canopy preventing the diffusion of water vapour from the moist peat substrate. Variations in canopy resistance behaviour are caused by variable degrees of canopy wetness for several days following rain. This behaviour poses difficulties for modelling evaporation in water balance studies, hence a simple scheme utilising the Penman potential open water evaporation is favoured.en_US
dc.language.isoen
dc.publisherElsevieren_NZ
dc.relation.urihttp://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V6C-3SWKC0S-1W&_user=100025&_coverDate=06%2F01%2F1997&_rdoc=8&_fmt=summary&_orig=browse&_srch=doc-info(%23toc%235811%231997%23998069998%2311974%23FLT%23display%23Volume)&_cdi=5811&_sort=d&_docanchor=&view=c&_ct=20&_acct=C000007699&_version=1&_urlVersion=0&_userid=100025&md5=9808bffa1966a237b3cd03ff86b24406en_US
dc.rightsThe final, definitive version of this article has been published in the Journal, Journal of Hydrology, 193(1-4), (1997), (c) 1997 Elsevier Science B.V. at the Elsevier Journals Online.en_US
dc.subjecthydrologyen_US
dc.subjectevaporationen_US
dc.subjectpeaten_US
dc.subjectsurface watersen_US
dc.subjectsoilsen_US
dc.subjectmathematical modelsen_US
dc.subjectraised peat bogen_US
dc.titleEvaporation from a raised peat bogen_US
dc.typeJournal Articleen_US
dc.identifier.doi10.1016/S0022-1694(96)03149-6en_US
dc.relation.isPartOfJournal of Hydrologyen_NZ
pubs.begin-page142en_NZ
pubs.elements-id39373
pubs.end-page160en_NZ
pubs.issue193en_NZ
pubs.volume.en_NZ


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