DR.-ING.PHATCHARASAK ARLAI

RESEARCH UNIT FOR SUSTAINABLE WATER AND ENVIRONMENTAL RESOURCES MANAGEMENT

NAKHON PATHOM RAJABHAT UNIVERSITYHTTP://RESEARCH.NPRU.AC.TH/RUSWEM/TH/INDEX.PH

PROF. DR. MANFRED KOCH

DEPARTMENT OF GEOHYDRAULICS AND ENGINEERING HYDROLOGY UNIVERSITY OF KASSEL, GERMANY

http://www.uni-kassel.de/fb14/geohydraulik/Welcome.html

Flood Inundation due to Dambreakand its Mitigation Plan

Literature Reviews

� Soralump and Tansupo(………..):

Literature Reviews

� Soralump and Tansupo(………..):

The Srinakarin Dam was designed by pseudostatic analyses (Kh = 0.1g)

Literature Reviews

� Soralump and Tansupo(………..):� Upper part of dam (higher than +145 m. to +180 m. (MSL))

might be significantly damaged by earthquake (Liquefaction, Horizontal Displacement)

Literature Reviews

� How an earthquake impacts a dam break?� US Army Corps of Engineer lists earthquake as a major cause

of dam failure

� Ground rupture is a major risk for large engineering structures such as dams

� Earthquakes may induce landslides

at U/S of the dam leading to large

(Tsunami-like) waves in reservoir.

� Overtopping� Breaching

Dam Break Flood Simulation and Flood Map

� The model to simulate the flood wave from dam break is HEC-RAS -allows to simulate steady-, unsteady flow, sedimentation transport/mobile bed computation and water temperature modeling

Dam Break Flood Simulation and Flood Map

� HEC-RAS can simulate overtopping and piping failure breaches an earthen dam.

� Inundation map of flood wave done by HEC-GeoRAS

Dam Break Flood Simulation and Flood Map

� HEC-RAS can show the simulated breaching section.

Dam Break Flood Simulation and Flood Map

� HEC-RAS can show the simulated breaching section.

Dam Break Flood Simulation and Flood Map

� HEC-RAS can show the simulated flood water level along the river.

Dam Break Flood Simulation and Flood Map

� HEC-RAS can show the simulated flood hydrograph from dam to the downstream locations.

Dam Break Flood Simulation and Flood Map

� HEC-RAS’s result will be imported into HEC-GeoRAS for a post-processing.

Dam Break Flood Simulation and Flood Map

� Dambreak may be run for 2 main cases as follows:� Dambreak at the upper part of dam crest due to earthquake

� Dambreak due to too much inflow or heavy rainfall at the U/S

� Dambreak due to both earthquake and too much inflow or heavy rainfall at the U/S.

Dambreak-HEC-RASFlood Routing-HEC-

RASPost-processing-HEC-GeoRAS

Flood Map (x,y,z,t)Emergency

Management

Emergency Management

� The aim of Emergency Management is to save lives, minimize damages to properties located at downstream as well as environment. As agenerally accepted principle, there are 3 main phases in Emergency Management concept, namely Risk Mitigation, Response and Recovery.

Thank you so much indeed for your attention