Sedimentation Model Area of Lau Kawar Lake from Volkanic Eruption of Sinabung Mountain in Karo District, North Sumatra Province

Lau Kawar Lake is a VolkanicLake has wide around 200 hectares which below hillside of Sinabung mountain located in Kutagugung Village, District Naman Teran, Karo District, North Sumatera Province. Impact eruption of mount Sinabungis Volkanic material in the form of important from clastic sediment to be donere search. Purpose of this research is HIBAH Dikti 2016 year, item to know type of sediment that is election mean, sorting, skewness and curtos is. and deposition public area of sediment volkanic post eruption of Sinabung. Primary data collection activities sediment core with PVC core method. generates data in the form of characters sediment grain size, sedimentary structures, sediment composition and sedimentary depositional environment interpretation presented in the stratigraphic column Lake Lau Kawar. Calculation method applied that is, Method of Moments (Mathematic) and Folk & Ward (Graphic). Result of sediment material analysis in 15 points , value mean either graphically mathematical and also shows flattening - plane of grain size coarse sand - very fine sand, Value sortasimoderately sorted - poorly sorted, Value skewnwessat smooth and rugged normal same relative distribution like at sample LK 11 LK 12 LK 13 LK 34 and LK 53, Curtosis value from overall of sample included in classification of finite mesokurtic of leptokurtic ( Kc = 0,90 - 1,1 and Kc= 1,11 - 1,50). Crossplot between values Y1 and Y2 indicates that deposition area to stay at [shallow/ superficial] deposition area at Y2 and y3 stays at fluvial area of marine, at Y3 and Y4 still residing in at fluvial deposition area of marine Data analysis result of screening of sediment sample is done to applies GRADISTAT, a program proposed by Blottand Pye ( 2011) and developed by Kenneth Pye Associates Ltd. Software GRADISTAT implemented in program Microsoft Excel.