STUDI PENGARUH HIDROLIKA, NAUNGAN, DAN POINT SOURCE TERHADAP DO-BOD SUNGAI MENGGUNAKAN MODEL QUAL2Kw (STUDI KASUS: SUNGAI GAJAHWONG, YOGYAKARTA)

• Main Author: LESTARI, A. DYAH NOVITASARI
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2012
• Subjects: Other Chemical Sciences
• Online Access: https://repository.ugm.ac.id/100063/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=56538
• Institution: Universitas Gadjah Mada

This research studied variables that affect water quality of Gajahwong River in preparing management and mitigation of water pollution. The study examined effects of hydraulic (n Manning (0.04-0.08), river's bottom width (1-15 m), and river's bottom slope (0.035-0.088 m/m)), shade (10-70 %), and point source load (discharges (0.001-0.2 m 3 /s) and BOD concentrations (10-100 mg/L)) to DO-BOD using QUAL2Kw model, then apply them to Gajahwong River. As water quality management indicators, distance and travel time of DO-BOD recovery have been investigated. Simulations of Gajahwong River were done by modeling 2011 conditions and verified with 2012 data. The results showed that both the increasing of n Manning and the river's bottom width shortened the travel distance of DO recovery, extended the travel time of DO recovery, shortened travel distance and time of BOD recovery. Both the increasing of river's bottom slope and shade shortened travel distance and time of DO recovery, but tend to extend travel distance and time of BOD recovery. Both the increasing of point source flow and concentration extended travel distance and time of DO-BOD recovery. QUAL2Kw modeling results of Gajahwong River showed that BOD concentration of the river has exceeded water quality standards class II. Simulations showed that management and control of Gajahwong River pollution can be done by creating communal WWTP in each district along the river with reduction of the upstream BOD concentration to 2 mg/L. These results showed that QUAL2Kw model can be used in studying DO- BOD recovery process to make river water quality management strategies.