Abstract. Sustainable flood risk management encompasses the implementation of nature-based solutions to mitigate flood risk. These measures include the establishment of land use types with a high (e.g. forest patches) or low (e.g. sealed surfaces) water retention and infiltration capacity at strategic locations in the catchment. This paper presents an approach for assessing the relative impact of such land use changes on economic flood damages and associated risk. This spatially explicit approach integrates a reference situation, a flood damage model and a rainfall-runoff model, considering runoff re-infiltration and propagation, to determine relative flood risk mitigation or increment related to the implementation of land use change scenarios. The applicability of the framework is illustrated for a 4800 ha undulating catchment in the region of Flanders, Belgium by assessing afforestation of 187.5 ha (3.9 %), located mainly in the valleys, and sealing of 187.5 ha, situated mainly at higher elevations. These scenarios result in a risk reduction of 57 % (100 856 €) for the afforestation scenario and a risk increment of

中文翻译：

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土地利用变化的洪水灾害比较和风险影响评估

摘要。可持续的洪水风险管理包括实施基于自然的解决方案以减轻洪水风险。这些措施包括在集水区的战略性位置建立具有高（例如森林斑块）或低（例如密封表面）保水和渗透能力的土地利用类型。本文提出了一种评估此类土地利用变化对经济洪灾损害和相关风险的相对影响的方法。这种空间明确的方法综合了参考情况，洪水破坏模型和降雨径流模型，同时考虑了径流的重新渗透和扩散，以确定与土地利用变化情景的实施相关的相对洪水风险缓解或增量。说明了该框架在法兰德斯地区4800公顷起伏流域的适用性，比利时通过评估主要位于山谷的造林面积为187.5公顷（3.9％），以及主要位于高海拔地区的造林面积为187.5公顷，进行了评估。这些方案使绿化方案的风险降低了57％（100 856€），风险增加了