Weather and water in the Sudano-Sahelian Zone

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.

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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; 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 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

Item Type: Conference or Workshop Item (Paper)
Subjects: Others > Agriculture-Farming, Production, Technology, Economics
Others > Climate Change
Depositing User: Library ICRISAT
Date Deposited: 04 Dec 2011 07:13
Last Modified: 04 Dec 2011 07:13
Acknowledgement: UNSPECIFIED
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