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Macroinvertebrates distribution in spatially heterogeneous gravel-bed rehabilitated river reach / Azamuddin Arsad

Macroinvertebrates distribution in spatially heterogeneous gravel-bed rehabilitated river reach_Azamuddin Arsad_A9_2016_MYMY
Dasar tidak seragam adalah jenis dasar yang dominan dalam saluran semulajadi yang mempunyai dasar berkerikil. Makroinvertebrata adalah organisma yang pertama akan mendiami saluran yang baru dipulihara. Kajian ini meneroka habitat dari segi fizikal dan hidraulik bagi saluran semulajadi dengan dasar bersusun atur jeram-kolam, terutamanya variasi dari segi tingkah laku hidraulik di atas permukaan dasar yang berbeza-beza. Maklumat daripada kawasan kajian di hilir Sungai Batu Sebelah di mana sungai tersebut telah dipulihara telah digunakan untuk mengambarkan kaedah pendekatan kajian ini. Suatu model hidrodinamik telah dicipta untuk mencerminkan aliran dasar bagi kawasan saluran kajian. Model hidrodinamik tersebut telah berjaya dikalibrasi dengan nilai pemalar hubung-kait R = 0.991 di hulu saluran, dan nilai pemalar hubung-kait R = 0.994 di hilir saluran. Pengesahan untuk model hidrodinamik tersebut telah menemukan hubung-kait di antara nilai-nilai dari model hidrodinamik tersebut adalah sangat hampir dengan nilai-nilai dari pengiraan secara manual, dengan nilai pemalar hubung-kait R = 0.999 hingga R = 1. Data biotik menunjukkan makroinvertebrata yang sensitif terhadap pencemaran dari order Ephemeroptera, Plecoptera, dan Trichoptera (EPT) seperti Baetis sp., Caenis sp., Heptageniidae, Leptophlebiidae, dan Hydropsyche sp. telah ditemukan di kawasan kajian. Data biotik tersebut mengesahkan bahawa kualiti air di hulu kawasan kajian berada dalam Kelas II seperti yang ditujukkan melalui Indek Kualiti Air di dalam Interim Standard Kualiti Air Kebangsaan, yang mana kualiti air tersebut dikelaskan sebagai sesuai untuk spesies haiwan akuatik yang sensitif. Nilainilai tekana ricih daripada model hidrodinamik telah diuji terhadap nilai-nilai tekana ricih yang digemari oleh makroinvertebrata yang ditemukan di kawasan kajian. Hasilnya menunjukkan bahawa kewujudan makroinvertebrata tersebut adalah berkaitan secara langsung dengan keadaan hidraulik berhampiran-dasar dimana makroinvertebrata tersebut tinggal. _______________________________________________________________________ Spatially heterogeneous bed is a dominant bedforms in gravel-bed channel of natural channels. Macroinvertebrates are among the first organism to resettle in newly rehabilitated channel. This study explores the macroinvertebrates distribution in relation with physical habitat and hydraulic properties of riffle–pool bedforms, particularly the variations in hydraulic performance on different bed oscillation morphologies. Information from the study reach at downstream of Sungai Batu Sebelah where the river was rehabilitated was used to illustrate the approach of this study. A hydrodynamic model was developed to reflects base flow discharge of the study reach. The hydrodynamic model have been sucessfully calibrated with correlation coefficient R = 0.991 at the upstream, and correlation coefficient R = 0.994 at the downstream. Validation for the model have found the correlation between the model predicted values are very close with the values from field measurement and calculational approach, with value of correlation coefficient R = 0.999 to R = 1. Biotic data shows pollution sensitive makroinvertebrata from the order of Ephemeroptera, Plecoptera and Trichoptera (EPT) such as Baetis sp., Caenis sp., Heptageniidae, Leptophlebiidae, dan Hydropsyche sp. were found at the study reach. The biotic data confirmed that the water qualirt at the upstream of the study reach to be in Class II as showed through Water Quality Indeks in the Interim National Water Quality Standard , which the water quality was classed as suitable for sensitive aquatic species. Values of shear stress from the hydrodynamic model were tested against the preferred shear stress by the macroinvertebrates that were found at the study reach. Result shows that the existence of benthic macroinvertebrates is associated with the hydraulics condition in which the organisms makes its home.
Contributor(s):
Azamuddin Arsad - Author
Primary Item Type:
Thesis
Identifiers:
Accession Number : 875008871
Language:
English
Subject Keywords:
heterogeneous; coefficient; Macroinvertebrates
Sponsor - Description:
Pusat pengajian Kejuruteraan Awam -
First presented to the public:
5/1/2016
Original Publication Date:
9/1/2020
Previously Published By:
Universiti Sains Malaysia
Citation:
Extents:
Number of Pages - 278
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2020-09-03 12:07:25.685
Submitter:
Mohamed Yunus Yusof

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