Malaysian Journal of Analytical Sciences Vol 19 No 6 (2015): 1335 - 1347

 

 

 

ASSESSMENT OF LAND USE CHANGE AND SEDIMENTATION MODELLING ON ENVIRONMENTAL HEALTH

IN TROPICAL RIVER 

 

(Penilaian Perubahan Guna Tanah dan Permodelan Sedimentasi ke atas

Kesihatan Persekitaran di Sungai Bertropika)

 

Mohd Ekhwan Toriman^1,2, Mohd Khairul Amri Kamarudin^1,3*, Thudchai Sansena⁴, Kampand Bhaktikuld⁵,

Roslan Umar¹, Asyaari Muhamad¹, Nor Azlina Abd Aziz¹, Nur Hishaam Sulaiman¹

 

¹East Coast Environmental Research Institute (ESERI),

Universiti Sultan Zainal Abidin, 21300 Kuala Terengganu, Terengganu. Malaysia

²School of Social, Development and Environmental Studies, Faculty of Social Sciences and Humanities,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

³Faculty of Design Arts and Engineering Technology,

Universiti Sultan Zainal Abidin, Gong Badak Campus, 21300 Kuala Terengganu Terengganu. Malaysia

⁴Informatics and Space Technology Department Agency, 10150 Bangkok, Thailand.

⁵Faculty of Environment and Resource Studies,

Mahidol University, Phutthamonthon 73170, Nakhon Pathom, Thailand

 

*Corresponding author: mkhairulamri@unisza.edu.my

 

 

Received: 14 April 2015; Accepted: 9 July 2015

 

 

Abstract

Sediments are defined as the organic and inorganic materials or solid fragments derived from the weathering processes of sand, pebbles, silt, mud and loess. The objective of this research is to forecast sediment volume in the Lam Phra Phloeng reservoir by using the Neuro-genetic Optimizer model to calculate the sediment volume from runoff, rainfall, and sediment volume data. The results from satellite imagery interpretation elucidated that from 2002 to 2005, forest area decreased approximately 50,220 km² or 36 %, and was converted to agricultural land. By applying the USLE equation, the soil erosion area was found to increase approximately 185,341 tons/year between 2002 and 2005. This result illustrated that the impact of land use change greatly increased sedimentation volume. In applying the Neuro-genetic Optimizer model, the learning rate and momentum of this model was 0.9 and 0.1, respectively, and the initial weight value was +/-3. The model forecasted the annual sediment volume in the Lam Phra Phloeng reservoir in 2005 to be 49,855 tons with R² equals to 0.9994. The regression model, on the other hand, forecasted the sediment volume using the equation Y=198. 48x 1.1783 with R² equals to 0.9974, and the annual sediment volume was estimated to be 45,346 tons. The actual sediment volume in the reservoir in 2005 was obtained from The Royal Irrigation Department, which was found to be 48,697 tons.

 

Keywords: sedimentation, land use change, Tropical River; USLE; neuro-genetic optimizer

 

Abstrak

Sedimen boleh ditakrifkan sebagai bahan organik dan bukan organik atau serpihan pepejal yang diperolehi daripada proses luluhawa pasir, batu kecil, kelodak, lumpur dan loess. Objektif kajian ini adalah untuk meramal jumlah sedimen dalam takungan Sungai Lam Phra Phloeng dengan menggunakan model Neuro-genetik Optimizer untuk mengira jumlah sedimen daripada data larian air, hujan, dan jumlah sedimen. Hasil daripada tafsiran imej satelit pada tahun 2002-2005, kawasan hutan merosot kira-kira 50.220 km² atau 36%, dan telah ditukar kepada tanah pertanian. Dengan menggunakan persamaan USLE, kawasan hakisan tanah didapati telah meningkatkan kira-kira 185.341 tan / tahun antara tahun 2002 dan 2005. Hasil kajian menunjukkan kesan perubahan guna tanah dan sedimentasi adalah meningkat. Berdasarkan model Neuro-genetik Optimizer, kadar pembelajaran dan momentum model ini adalah 0.9 dan 0.1, dan nilai berat badan awal adalah +/- 3. Model ini meramalkan jumlah sedimen tahunan dalam takungan Lam Phra Phloeng pada 2005 meningkat kepada 49.855 ton yang bersamaan dengan R² 0.9994. Model regresi, di bahagian lain pula, diramalkan dengan menggunakan persamaan Y = 198. 48 x 1.1783 dengan bersamaan dengan R² 0.9974. Jumlah sedimen tahunan pula dianggarkan sebanyak 45346 tan. Jumlah sedimen sebenar dalam takungan pada tahun 2005 telah diperolehi daripada Jabatan Pengairan Diraja, iaitu sebanyak 48.697 tan.

 

Kata kunci: sedimentasi, perubahan guna tanah; Sungai Tropika; USLE; neuro-genetik optimizer

 

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