Abstract. The refined assessment of the direct economic losses of flood disasters is important for emergency dispatch and risk management in small- and medium-sized cities. There are still great challenges in the accuracy and timeliness of the previous research methods. In this study, a single flood disaster in Lishui city in 2014 was taken as an example to study and verify a method for the rapid and refined assessment of direct economic loss. First, based on a field investigation, the inundation range and submerged depth simulated by the flooding model were verified. Next, the urban land use status map and high-precision remote sensing classification data were fused and combined with expert questionnaire surveys, thereby providing the types and values of disaster-bearing bodies. Then, the existing vulnerability curve database was summarized, and the curves were calibrated by disaster loss reporting. Finally, the spatial distributions of the flood disaster loss ratio and loss value were estimated by spatial analysis. It is found that the constructed land use map has detailed types and value attributes as well as high-precision spatial information. Secondly, the vulnerability curves after function fitting and calibration effectively reflect the change characteristics of land use loss ratio in this area. Finally, the estimated loss ratio and loss value distributions can accurately reflect the spatial pattern of flood disaster loss, which is useful for the government to formulate effective disaster reduction and relief measures.

中文翻译：

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基于土地利用空间评估和脆弱性量化的洪水灾害直接经济损失评估——以2014年丽水市洪水为例

摘要。精细化评估洪涝灾害直接经济损失对于中小城市应急调度和风险管理具有重要意义。以往的研究方法在准确性和及时性方面还存在很大挑战。本研究以2014年丽水市单次洪涝灾害为例，研究验证了一种快速精细化直接经济损失评估方法。首先，基于实地调查，验证了洪水模型模拟的淹没范围和淹没深度。接下来，将城市土地利用现状图和高精度遥感分类数据融合，结合专家问卷调查，提供受灾体的类型和价值。然后，总结现有的脆弱性曲线数据库，曲线由灾害损失报告校准。最后，通过空间分析估计了洪水灾害损失率和损失值的空间分布。发现构建的土地利用图具有详细的类型和价值属性以及高精度的空间信息。其次，函数拟合校准后的脆弱性曲线有效地反映了该地区土地利用损失率的变化特征。最后，估算的损失率和损失值分布可以准确反映洪涝灾害损失的空间格局，有助于政府制定有效的减灾救灾措施。发现构建的土地利用图具有详细的类型和价值属性以及高精度的空间信息。其次，函数拟合校准后的脆弱性曲线有效地反映了该地区土地利用损失率的变化特征。最后，估算的损失率和损失值分布可以准确反映洪涝灾害损失的空间格局，有助于政府制定有效的减灾救灾措施。发现构建的土地利用图具有详细的类型和价值属性以及高精度的空间信息。其次，函数拟合校准后的脆弱性曲线有效地反映了该地区土地利用损失率的变化特征。最后，估算的损失率和损失值分布可以准确反映洪涝灾害损失的空间格局，有助于政府制定有效的减灾救灾措施。