Universiti Teknologi Malaysia Institutional Repository

Comparison of rainfall interpolation methods in Langat river basin

Hassim, M. and Yuzir, Ali and Razali, M. N. and Ros, F. C. and Chow, M. F. and Othman, F. (2020) Comparison of rainfall interpolation methods in Langat river basin. In: 7th AUN/SEED-Net Regional Conference On Natural Disaster 2019, RCND 2019, 25 November 2019 - 26 November 2019, Putrajaya, Malaysia.

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Official URL: http://dx.doi.org/10.1088/1755-1315/479/1/012018

Abstract

Rainfall is an element of climate that can be measured by a rain gauge. The rain gauge was set up for every station predefined by the Department of Irrigation and Drainage (DID) Malaysia. One millimeter (mm) of rainfall means that within a square meter of a flat surface, water can be as high as one mm. In the hydrology model, the rainfall data is very important in order to predict the flood or assist in the disaster mitigation plan. In this case, the availability of complete rainfall data in a region is essential. By performing spatial interpolation, rainfall data can predict values from the empty data at each point. In this study, Inverse Distance Weighting (IDW), Ordinary Kriging (OK), Simple Kriging (SK) and Kernel Smoothing (KS) method were considered in the rainfall interpolation for this area. Rainfall data at 20 points in Langat River Basin that obtained from DID Ampang for the period 2008-2017 were used as reference data. This study aimed to compare IDW, Kriging and Spline methods to obtain better interpolation methods. The interpolation is done by running a cross-validation using a geostatistical wizard in ArcGIS. The method effectiveness was evaluated by the calculation of mean error (ME), Root Mean Square Error (RMSE), Root mean Square Standardize Error (RMSSE) and Average Standard Error (ASE). For IDW method, only the ME and RMSE results are available. From the result, it can be seen that SK method outperforms the IDW, OK and KS method for these rainfall interpolations in Langat River Basin by showing better statistical evaluation.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:disaster mitigation, hydrology modeling, interpolation method
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Malaysia-Japan International Institute of Technology
ID Code:92662
Deposited By: Yanti Mohd Shah
Deposited On:28 Oct 2021 10:18
Last Modified:28 Oct 2021 10:18

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