KAJIAN SEDIMEN TRANSPOR DAN PERUBAHAN MORFOLOGI SUNGAI OPAK PASCA ERUPSI GUNUNGAPI MERAPI TAHUN 2010 by , RONA MENTARI KUSUMA HATI, , Dr. Danang Sri Hadmoko, M.Sc.

“…Efforts necessary to be done in Opak River management are : monitoring river stream condition periodically and taking some material along the stream in order to flowing water unavoidably through the stream.…”

KARAKTERISTIK PERSEBARAN GRANULOMETRIS SEDIMEN PERMUKAAN DASAR SUNGAI DI DAS PABELAN, PROVINSI JAWA TENGAH by , WIDIYANTO, , Prof. Dr. Sutikno

“….: a) percentage of grain sediment size was highest in fractions of small pebble, b) percentage of grain riverbed sediment sphericity was highest in spherical class, and c) percentage of grain riverbed sediment roundness was highest in round class. (2) The effect of Sabo Dam on the riverbed sediment characteristics are: a) grain size riverbed sediment in the upstream is smaller than downstream, except if there is any process differences, b) Sabo Dam have less influence for distribution of grain riverbed sediment sphericity and grain riverbed sediment roundness. (3) The sand mining on the upstream led to the scarcity of sand in the downstream. (4) River management can be done by: a) a) Using innovation technology for increasing of sand and stone value. b) Enforcement of laws and regulations related to the river. c) Improving education for miner families, so they can work outside the field of mining. d) Preservation of sediment control and structuring of mining so did not cause rivers damage. e) Placement of supervisors mining officer, who highly dedicated, honest and capable as a negotiator.…”