flood Modelling of Kalu-Ganga river basin

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Presentation transcript:

flood Modelling of Kalu-Ganga river basin H. K. Nandalal Department of Civil Engineering University of Peradeniya Peradeniya Sri Lanka

Introduction Problems related to flooding have greatly increased over recent decades because of population growth development of extensive infrastructures in close proximity to rivers It is importance to find solutions by utilizing modern technology like Geographic Information Systems (GIS), Remote Sensing (RS) and flood modeling

Outline of the Presentation Study area Data used Software used Application of Software HEC-HMS HEC-RAS ENVI

Study Area Kalu-Ganga river basin in Sri Lanka Total catchment area is 2719 km2 Entire basin lies within the wet zone. Average annual runoff is around 7600 MCM. Catchment experiences average annual rainfall of 4000 mm.

Study Area Study concentrates on the lower reaches of the river Area of interest is nearly 500 km2 This includes 5 Divisional Administrative Divisions (DSD)

Data Used

Data used TIN Model of the Study area Contour Data LIDAR DATA

Data used Locations of rainfall and discharge gauging stations

Data used Satellite images Raw Images (Dry Date, 03 March,2008) ALOS – PALSAR (HH) Raw Images (Wet Date, 03 June,2008) ALOS – PALSAR(HH)

Data used Data Collection and Data-basing…

Application of HEC-HMS Rainfall –Runoff Modeling

Application of HEC-HMS Basin model developed using HEC-GeoHMS

Application of HEC-HMS Results of the verification runs to compare the simulated flows and the observed flows of the calibrated HEC-HMS model

Application of HEC-RAS Flood Modeling

Application of HEC-RAS Geometric Data: HEC-GeoRAS export Stream C/L River banks Flow paths

Application of HEC-RAS Discharge data obtained from HEC-HMS Mawakoya Elagawa Junction Mawakoya/Kalu Ganga Kuda Ganga Junction Kuda Ganga/Kalu Ganga Flow (m3/s) data at\Return Period 10yr 20yr 50yr 100yr Elagawa 1062.6 1319.7 1798.1 2605.5 Junction KudaGanga/ Kalu Ganga 1455.7 1836.9 2524.4 3743.3 Mawak Oya 97.5 122.2 174.4 245.5 Junction Mawak Oya/Kalu Ganga 1079.5 1340.5 1828.5 2647.7 Kuda Ganga 414.4 555.3 817.1 1260.7

Application of HEC-RAS HEC-RAS output

Application of HEC-RAS HEC-RAS output

Application of HEC-RAS Flood Hazard Maps from HEC-RAS

Verification of model result by satellite data Raw Images (Dry Date, 03 March,2008) ALOS – PALSAR (HH) Raw Images (Wet Date, 03 June,2008) ALOS – PALSAR(HH)

Band Math Image (WET-DRY) (Difference dB image Wet - Dry) Mask

Flood extent resulted by satellite data

Comparison of the Flood extent derived from HEC-RAS model and Satellite image

Final Flood Hazard Maps

Thank you for your patience. Questions?