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Assessing Chinese flood protection and its social divergence
Natural Hazards and Earth System Sciences ( IF 4.6 ) Pub Date : 2021-02-24 , DOI: 10.5194/nhess-21-743-2021 Dan Wang , Paolo Scussolini , Shiqiang Du
Natural Hazards and Earth System Sciences ( IF 4.6 ) Pub Date : 2021-02-24 , DOI: 10.5194/nhess-21-743-2021 Dan Wang , Paolo Scussolini , Shiqiang Du
China is one of the most flood-prone countries, and development within
floodplains is intensive. However, flood protection levels (FPLs) across the
country are mostly unknown, hampering the present assertive efforts on flood
risk management. Based on the flood-protection prescriptions contained in the
national flood policies, this paper develops a dataset of likely FPLs for
China and investigates the protection granted to different demographic
groups. The new dataset corresponds to local flood protection designs in 91
(53.2 %) of the 171 validation counties, and in 154 counties
(90.1 %) it is very close to the designed FPLs. This suggests that
the policy-based FPLs could be a valuable proxy for designed FPLs in
China. The FPLs are significantly higher than previously estimated in the
FLOPROS (FLOod PROtection Standards) global dataset, suggesting that Chinese flood risk was probably
overestimated. Relatively high FPLs (return period of ≥50 years) are seen in
282 or only 12.6 % of the evaluated 2237 counties, which host a
majority (55.1 %) of the total exposed population. However,
counties with low FPLs (return period of <50 years) host a disproportionate
share (52.3 %) of the exposed vulnerable population (children and
elders), higher than their share (44.9 %) of the exposed
population. These results imply that to reduce social vulnerability and
decrease potential casualties, investment in flood risk management should
also consider the demographic characteristics of the exposed population.
更新日期：2021-02-24
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