Application of a conceptual method for separating runoff components in daily hydrographs in Kimakia forest catchments, Kenya
✍ Scribed by J. M. Mugo; T. C. Sharma
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 118 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0885-6087
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✦ Synopsis
This paper highlights the use of a conceptual method for separating runo components in daily hydrographs, contrary to the traditionally used graphical method of separation. In the conceptual method, the components, viz. surface ¯ow, inter¯ow and base¯ow, are regarded as high, medium and low frequency signals and their separation is done using the principle of a recursive digital ®lter commonly used in signal analysis and processing. It requires estimates of the direct runo (b d ) and surface runo (b s ) ®lter parameters which are obtained by a least-squares procedure involving base¯ow and inter¯ow indices based on graphical and recursive digital ®lter estimation techniques. The method thus circumvents the subjective element associated with the graphical procedure of hydrograph separation, in which case the eye approximation and/or one's skill at plotting is the prime basis for the whole analysis. The analysis based on three forest catchments in Kimakia, Kenya, East Africa, revealed that b d K b and b s K i , where K b and K i are the base¯ow and inter¯ow recession constants.