SALT FLUX MODELING IN KAPUAS ESTUARY

• Main Author: SYIFA WIDYASTUTI ( NIM: 22413003 ); Pembimbing : Dr. Eng. Nining Sari Ningsih, MARAYA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/18867
• Institution: Institut Teknologi Bandung

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.