Path: TopS2-ThesesEarth Sciences-FITB2014

PEMODELAN FLUKS GARAM DI ESTUARI KAPUAS

SALT FLUX MODELING IN KAPUAS ESTUARY

Master Theses from JBPTITBPP / 2017-09-27 14:33:18
Oleh : MARAYA SYIFA WIDYASTUTI ( NIM: 22413003 ); Pembimbing : Dr. Eng. Nining Sari Ningsih, S2 - Earth Sciences
Dibuat : 2014, dengan 7 file

Keyword : Estuari Kapuas, fluks garam, intrusi garam, ROMS.

Studi fluks garam di Estuari Kapuas dilakukan dengan pemodelan 3 dimensi (3D) ROMS_AGRIF pada bulan September 2009. Pada bulan ini, arus bergerak dari utara ke selatan lalu sebagian berbelok ke tenggara hingga memasuki Sungai Kapuas saat muka air surut menuju pasang dan muka air pasang, sedangkan pada saat muka air pasang menuju surut dan muka air surut, arus di Sungai Kapuas mengalir ke luar sungai dan bersama massa air dari selatan bergerak ke arah utara dengan besar kecepatan berkisar 0,05-0,42 (0,02-0,1) m/dt di daerah estuari dan 0,2-0,75 (0,05-0,21) m/dt di sekitar Selat Karimata saat spring (neap). Nilai salinitas permukaan yang didapatkan dari hasil model berkisar 29-33 psu di sekitar Selat Karimata dan dapat mencapai 26 psu di sekitar estuari. Pada bulan ini, isohalin 0 psu di Sungai Landak terletak pada jarak 18 (17) km dari percabangan pada kondisi neap (spring). Sementara itu, isohalin 0 psu di Sungai Kapuas kecil terletak pada jarak 10 km dari percabangan baik pada kondisi spring maupun neap. Fluks garam di muara Sungai Kapuas berkisar -3 s/d 3 x 105 psu m/dt dan nilainya semakin mengecil seiring bertambahnya jarak dari muara. Di estuari ini juga terdapat ketidaksimetrian fluks garam dimana garam yang dibawa keluar lebih banyak dibandingkan garam yang masuk. Fluks garam karena exchange flow dan osilasi pasut mempunyai nilai maksimum masuk ke dalam sungai pada kondisi spring, sementara fluks garam karena debit sungai mempunyai nilai minimum ke luar sungai pada saat spring.

Deskripsi Alternatif :

Study about salt flux in Kapuas Estuary has been done by three-dimensional (3D) modeling using ROMS_AGRIF on September 2009. During this month, water mass flowed southward and then partially turned to the southeast to enter the Kapuas River (when the water level in ebb toward flood and flood condition), while the water level in flood toward ebb and ebb condition, water mass in the Kapuas River flowed out from the river and flowed northward. The velocity magnitude ranged from 0.05 to 0.42 (from 0.02 to 0.1) m/s in the estuary and from 0.2 to 0.75 (0, 05 to 0.21) m/s around the Karimata Strait when spring (neap). The surface salinity that obtained from model, ranged from 29 to 33 psu around Karimata Strait and could reach 26 psu around the estuary. In Landak River, the halocline of 0 psu was located at 18 (17) km from intersection of main river during neap (spring) conditions. While in Kapuas Kecil River, halocline of 0 psu was located at 10 km from intersection of main river both spring and neap conditions. Salt flux in the mouth of the Kapuas River ranged -3 to 3 x 105 psu m/s and the value got smaller with increasing distance from the estuary. In this estuary also occurred an asymmetrycal salt flux where the salt that left the river was much more than salt that entered the river. Salt flux due exchange flow and tidal oscillation had a maximum value into the river in spring conditions, while salt flux due river discharge had a minimum value out of the river during the spring.

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  • Pembimbing : Dr. Eng. Nining Sari Ningsih ;






    Dr. Eng. Nining Sari Ningsih, Editor: Alice Diniarti

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