Rapid assessment of river morphology changes using River Morphologic Stability Index (RMSI) and River Regime Concept, a case study of Plumbon River, Semarang City, Central Java Renaldy Andrean(a), Yadi Suryadi(a,b), Eka Oktariyanto Nugroho(a,b), Widharta Kusuma(a)
Water Resources Management, Master Program, Bandung Institute of Technology(a), Water Resources Engineering Group, Civil Engineering Study Program, Faculty of
Civil and Environmental Engineering, Bandung Institute of Technology (b)
renaldyandrean[at]gmail.com, yadisuryadi991[at]gmail.com, nugrohoeka[at]ftsl.itb.ac.id, widharta_kusuma[at]yahoo.com
Abstract
This paper presents a case study on assessing river morphology changes using two conceptual methods, River Morphologic Stability Index (RMSI) and River Regime Concept. The assessment for the case site, Plumbon River, is grouped into six sections based on its slope level. Slope level would become the main dependent variable in this study. RMSI is a rapid assessment tool used to characterize or evaluate either channel condition or channel stability. Five indexes^ methods of RMSI including CSI, OSEPI, CCSI, JSI, and PSI, are used in this study with parameters classification of: (a)Substrate type- (b)Channel geometry- (c)Streambank condition- (d)Stream condition- and (e)Artificial features. Parameters inside these indexes are analyzed through qualitative and quantitative analysis. River Regime Concept is a method to dimension a stable channel that has the quality to neither erode nor depose, thus indicating a channel with little potential of morphology changes. Three methods of River Regime Concept including Lacey, Blench, and Minimum Energy Concept, that rely heavily on parameters such as: (a)Channel Geometry- and (b)Stream Condition. Both methods are analyzed to present connection and combination as an initial step of providing a new rating index method for river with limited datas.
Keywords: Plumbon River, River Morphologic, River Morphologic Stability Index, River Regime Concept
