FLOOD & DEBRIS FLOW

REFERENCES1. Fujita, M., 2004, Debris and Flood Control System, Bahan Kuliah MPBA, Yogyakarta2. Graf, W.H., 1984, Hydraulics of Sediment Transport, Mc. Graf Hill, N.Y., USA3. Kironoto, B. A., 1997, 2003, Hidraulika Transpor Sedimen, Diktat Kuliah S2-Teknik Sipil UGM, Yogyakarta (In Indonesia)4. Yang, C., T., 1996, Sediment Transport Theory And Practice, 5. etc. (many other references from websites)

Clasification of Sediment TransportMassive movementDebris flowsMud flowsLandslidesPyroclastic flowsBed loadSuspended loadWash loadIndividual movementSediment movement

Characteristics of Sediment TransportGaya Dominan Material Massive movementMixture of sediment and waterSedimentIndividual movementGravity forceFluid force

Debris flow process

Contents of my Lecture: (individual of sediment movement)Properties of Water and SedimentIncipient Motion Criteria and ApplicationResistance to flow and bed formsBed Load TransportSuspended Load TransportTotal Load Transport

What is Sediment Transport?Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid.

The generic categories of sediments is as follows GravelSand SiltClay

Clasification of Individual sediment transport : based on the mechanism of sediment movement and on the origin of SedimentThe origin of SedimentBed material loadThe mechanism of Sediment movement

Sediment (individual) Movement can be distuinguished as suspended and bed loadSediment movement due to Fluid Force

Bed Load TransportFluid forceRolling Sliding Saltating

wf, = vertical turbulent velocity, wo = falling velocity Suspended Load Transport

Sample of turbid waterWash loadWash loadSand particles finer than about 0.1 mm in diameterWash LoadSample of bed materialsSuspended load

EXAMPLES OF SEDIMENT TRANSPORT PROBLEMS (IN PICTURES)(INDIVIDUAL & MASSIVE MOVEMENTS)

Suspended Sediment Mixing (polutan)

River bank erosion and abrasion

local scouring problems around abutment

local scouring around the pier

Bar and Meandering Formation

Bed material range in the river

Sheet and rill Erosion problems

Contoh :Waduk WONOGIRI (GAJAH MUNGKUR) Kapasitas Tampungan : 554,96 Juta m3Usia rencana waduk : 100 thPermasalahan sedimentasi sudah terjadi pada saat usia operasi waduk baru 20 th telah dilakukan upaya pengerukanSuara MerdekaKompas

Sedimentation Process in ReservoirReservoir sedimentation problem due to Suspended Sediment DepositionDeposition process of Bed loadDeposition process of Suspended Load

Result of Debris Flow

Hasil Aliran Debris Flow

Hasil Aliran Debris

Result of Debris Flow

Video related with Sediment TransportBed LoadRipple movementDunes movementPlain bedAntidunesBraided Stream 1 ; Braided stream 2Coastal Sediment TransportDebris Flow 1, Debris Flow 2, Debris Flow 3

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