Landform Investigation and Suspended Sediment in Stream Flow of the River in Geopark Silokek

Abstract

Geopark is a geological region that contributes to protecting the improvement of the function of natural heritage. In this Silokek Geopark, there are old rocks that are 359 million years old and a lot of golden mining operations around the river. The purpose of this research is to identify and map the land formin geopark area and suspended sediment in river streams. The method in this research is a spatial analysis overlay map to create a geomorphology map, analyzing Inverse Distance Weighted Interpolation with GIS device, field survey, and measure sedimentary in the laboratory. There has take water samples in many locations used purposive sampling. Results of the research have found the landform type is denudational hills, escarpment, anticlinal ridges, anticlinal valleys in the geopark area and an alluvial plain made up of channel bar and point bar with the highest grade of sediment 0,8 mg/l and 0,74 mg/l, and the lowest rate 0,006 mg/l. The largest position of sedimentation concentrated on meander at 143º and 117º, river meander with a relatively skewed angle of elevation affects the river's sedimentary value because they are processes the erosion of river walls at meander. On meander, with a 143º angle, there was a very high sedimentation rate which point bar and meander with117º angle there channel bar.