PhD Thesis Emmanuel Obeng Bekoe - Cranfield University

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water resource assessments in South Africa (Schultz et al., 1990); for irrigation
supply (Dent, 1998) and for flood studies in Mozambique and Zimbabwe
(Smithers et al., 2001). For forest hydrology (Jewitt & Schulze,1999; Herpertz,
1994; Gillham & Haynes, 2001; Tarboton & Schulze, 1992; Smitters & Schulze,
1997; Kienzle et al., 1997; DeClerk, 1999; Tarboton & Cluer, 1991; Smithers,
1991; Smithers & Caldecott, 1993; and Jewitt, & Schulze,1993) all in southern
Africa.
Some of the advantages of ACRU for this study include
• Ready application to catchments of varying scale and complexity
• Its adoption of the use of the A-pan as the reference potential evaporation
which is the mostly common used method in West Africa and Ghana.
• Additional alternative methods to compute potential reference evaporation
when data other than the Apan are available.
• The process of delineating cell boundaries is based on a manual technique
rather than relying on a DEM.
A disadvantage of ACRU with respect to this study is that the model has been
used mainly in Southern Africa within mostly semi arid environments.
3.3.6 Comparison of the ANSWERS2000, SWAT and ACRU models
From a review of the literature and a consideration of the processes used in
each of the models (Table 3.3), the following comparisons are made:
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Emmanuel Obeng Bekoe Phd Thesis Chapter 3 Catchment-Hydrol,& Model Selection