Abstract
Pabelan River is one of the rivers in the western slopes of mount Merapi located in Magelang Regency, Central Java province. Pabelan River has watersheds ± 84,70 km 2 with the main river length ± 28,40 km 2 . The purpose of this research was to estimate the amount of sediment transport that occurred at the point of view in the Pabelan River and to know estimate of sediment balance that occurred at the point of view in the Pabelan River. This research was conducted to find out the sediment balance in the Pabelan River whether going on degradation , aggradation , or experience the equilibrium transport. Calculation of sediment balances based on the volume of sediment transport entering at the location selected. Based on the results of sediment transport analysis using MPM, EINSTEIN, DU BOYS and ROTTNER formula, the largest sediment transport volume occurred in PA-C 5 = 4850,592 m 3 /m/flood, 305,8398 m 3 /m/flood, 20321,979 m 3 /m/flood and 80274,221 m 3 /m/flood, while the result of calculation based on formula FRIJLINK largest sediment transport volume occurred at PA-C 3 = 3654,817 m 3 /m/flood. To obtain the result of equilibrium sediment that occurred in the river of research is by using the five formula with the condition of the river that occurred aggradation and degradation with the biggest condition is the result of calculation with the formula ROTTNER for aggradation occurs in PA-C X Prumpung amount of 47272,806 m 3 /m/s with increase river bed amount of 13,504 m and degradation occurred at PA-C 5 -47468,692 m 3 /m/s with decrease at river bed -23,698 m.
Highlights
of the rivers in the western slopes of mount Merapi located in Magelang Regency
The purpose of this research was to estimate the amount of sediment transport
that occurred at the point of view
Summary
Yang dimaksud dengan penambangan adalah semua kegiatan penambangan yang mana meliputi eksplorasi, eksploitasi, pengangkutan dan pengelolaan serta penjualan. Bagian hulu (di atas Check Dam Sengi), sedimen berasal dari erosi lahan dan erosi alur sungai, baik pada dasar dan tebing sungai serta erosi lahan dari gunung Merbabu dan hanya sedikit dari gunung Merapi karena daerah ini terdapat anak sungai yaitu sungai Apu yang berhulu di gunung Merapi. B. Mulai dari Check Dam sengi ke hilir sampai dengan muara Sungai Pabelan di sungai Progo, sangat dipengaruhi oleh material yang berasal dari gunung Merapi berupa endapan vulkanik , karena di daerah ini terdapat dua anak sungai yang berhulu di sungai Merapi yaitu sungai Trising dan sungai Senowo. Proses angkutan sedimen yang mungkin terjadi pada dua penampang melintang sungai akibat angkutan sedimen dapat disederhanakan pada Tabel 1
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