Assessment of vulnerability to flood disasters based on emergy theory

On the basis o f t he rainsto rm and f loo d dat a of Zhengzho u in 2015, w e applied the emerg y analysis metho d to evaluat e the regional v ulner ability to floo d disasters fr om the ecolo gica l perspectiv e. The emer gy w as then considered as a normalized ba2 sis. Based o n the results of emer g y ev aluatio n and the emer gy index r epr esenting t he reg io nal v ulnerability to floo d disasters, w e used t he g eo gr aphic info rmatio n sy stem ( GIS) to analyze the spat ial difference o f vulnerability to flo od disasters in Zheng zhou. Results show ed t hat t her e w ere obvio us differences in the spatia l distribution of vulnerability to floo d disasters. The v ulnerabili2 ty of Xinm i was the hig hest and that o f Xinzheng w as the low est. I n a who le, the vulnerability to flo od disasters in Zhengzho u City tended to decrease from t he middle to the peripher y. Im pr oving the ada ptability of the sy stem effectively is the key to re2 ducing the vulnerability .

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