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Weather and water in the Sudano-Sahelian Zone

OAR@ICRISAT

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Relation http://oar.icrisat.org/4663/
 
Title Weather and water in the Sudano-Sahelian Zone
 
Creator Monteith, J L
 
Subject Agriculture-Farming, Production, Technology, Economics
Climate change
 
Description Evaporation horn bare soll surfaces and from
vegetation plays a dominant role in the watcr balance of the
Sudano-Sahelian zone. Starting from the formula first derived by
Penman, equations are derived for (i) evaporation hom bare soil:
(ii) potential transpiration hom well-watered crop stands; and
(iii) actual evaporation from a reglon. ll~cae equations were used to
estimate rates of evaporation in southern Nkr with emphasis on
the contrast bchvccn a vcrv dw y~ar(1 984) and n set vear 11988).
~hacnn ual evaporation f;om-d.re Dbi~ ia estimated io be'aboit
230 mm. Potential evaporation from uopa In the wst season is close
to 6 mm per day, consistent with meaarrcmmts by Dancctte, but is
underestimated in the dry sewn by the original Penman equation
and by the Priestlcy-Taylor equation Actual reglonal evaporation
estimated belwr.cn 1984 and 1989 ranged between 300 and 500 mm.
Corresponding esHrnates of runoff arc consistent wlth published
measurements raneine horn about 30 to 230 mm for areas with
little vegetation and horn rcro to about 110 mm for areas with 50%
vegetation
 
Date 1991
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/4663/1/CP_625.pdf
Monteith, J L (1991) Weather and water in the Sudano-Sahelian Zone. In: Soil Water Balance in the Sudano-Sahelian Zone Proceedings of the Niamey Workshop, February 1991, Niamey, Niger.