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DYNAMIC MODEL FOR SEDIMENT TRANSPORT
DUE TO VOLCANIC ACTIVITIES
SUTANTO SOEHODHO
Center for Transport Studies
Department of Civil Engineering
University of Indonesia
Depok 16424, Indonesia
Tel. 62-21-7270029
Fax. 62-21-7270028
E-mail: tanto@ eng.ui.ac.id
ABSTRACT
It is a crucial matter for Indonesia as a country with many active volcanoes that a control
system of their activities is made for mitigation. The flow of volcanic sediments like sand
is a focus in this paper through which a dynamic control system of sacks called as Sabo is
to be developed. The dynamic property of the system is the balance between the inflow of
sandy materials from volcanic activity and the outflow of the materials due to mining.
Sabo in some extend is aimed at the mitigation to halt the heavy down stream flow of
sediments towards the village communities, however its mining may also be done by
communities. The optimal size of sabo is then a matter to be modeled subject to random
properties of inflow and outflow of sandy sediment itself. A dynamic control system is
developed into model based on real data obtained from Merapi mountain in Central Java
Island which is considered very active, and consequently a simulation is made to predict
the inflow and outflow in the following years to determine the optimal size of sabo. The
model has been simulated and successfully indicated the optimal size of sabos and their
potential location of placement.
