Comprehensive risk analysis of storm surge flood based on WebGIS

Abstract

The comprehensive risk analysis of storm surge flood is vital to the safety management of sea embankment, the scientific assessment of storm surge disaster and the improvement of emergent treatment in storm surge hazard. Based on the research of disaster-causing, disaster-pregnant and disaster-bearing factors, the influencing factors of storm surge risk are concluded to be flood natural risk, embankment position, embankment width and height. The membership degree of the factors of storm surge risk is firstly determined by storm surge flood evolution based on WebGIS, and the comprehensive risk membership and risk grade of each influencing factor are obtained. Then the effects of a single factor on comprehensive risk and sensitivity analysis are discussed, and the storm surge flood risk map is obtained. Finally, the storm surge of Tianjin Binhai New Area is taken as a case. The results show that the influencing degree of the factors on the comprehensive risk membership is in decreasing order of flood natural risk, embankment position, embankment width and height. The flood risk map of the case is drawn, which is useful to decrease losses caused by storm surge disaster.

Keywords

storm surge / comprehensive risk / WebGIS / sensitivity analysis / risk map

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