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Development of an appropriate procedure for estimation of RUSLE EI30 index and preparation of erosivity maps for Pulau Penang in Peninsular Malaysia

Shamshad, A. and Azhari, M.N. and Isa, M.H. and Hussin, W.M.A.W. and Parida, B.P. (2008) Development of an appropriate procedure for estimation of RUSLE EI30 index and preparation of erosivity maps for Pulau Penang in Peninsular Malaysia. Catena, 72 (3). pp. 423-432. ISSN 3418162

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Abstract

Pluviographic data at 15 min interval from 6 stations in Pulau Penang of Peninsular Malaysia were used to compute rainfall erosivity factor (R) for the revised universal soil loss equation (RUSLE). Three different modelling procedures were applied for the estimation of monthly rainfall erosivity (EI<sub>30</sub>) values. While storm rainfall (P) and duration (D) data were used in the first approach, the second approach used monthly rainfall for days with rainfall ≥ 10 mm (rain<sub>10</sub>) and monthly number of days with rainfall ≥ 10 (days<sub>10</sub>). The third approach however used the Fournier index as the independent variable. Based on the root mean squared error (RMSE) and the percentage error (PE) criteria, models developed using the Fournier index approach was adjudged the best with an average PE value of 0.92 and an average RMSE value of 164.6. Further, this approach was extended to the development of a regional model. Using data from additional sixteen stations and the Fournier index based regional model, EI<sub>30</sub> values were computed for each month. ArcView GIS was used to generate monthly maps of EI<sub>30</sub> values and also annual rainfall erosivity (R). The rainfall erosivity factor (R) in the region was estimated to vary from 9000 to 14,000 MJ mm ha<sup>- 1</sup> h<sup>- 1</sup> year<sup>- 1</sup>. © 2007 Elsevier B.V. All rights reserved.

Item Type:Article
Uncontrolled Keywords:ArcView; erosivity; estimation method; Fourier transform; GIS; map; rainfall; Revised Universal Soil Loss Equation; soil erosion; Asia; Eurasia; Malaysia; Penang; Southeast Asia; West Malaysia
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Departments / MOR / COE:Departments > Civil Engineering
ID Code:2889
Deposited By: Assoc Prof Dr Isa Mohd Tan
Deposited On:06 Oct 2010 03:53
Last Modified:19 Jan 2017 08:26

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