以山洪灾害风险评价的多准则决策模型、最大熵模型、信息量模型三种常见模型为研究对象,选取河西走廊和张掖市为地理区划(大中)、市域(小)空间尺度研究区,构建山洪灾害风险评价指标体系,分别完成基于三种模型的两种空间尺度的山洪灾害风险评价制图,基于甘肃省地质灾害调查与区划报告数据从模型验证、空间自相关、精度对比和尺度效应等角度对比分析三个模型应用于不同空间尺度的适应性,并给出优选模型。结果表明:最大熵模型是河西走廊(地理区划)空间尺度上山洪灾害风险评价的优选模型;多准则决策模型不适用于张掖市(市域)空间尺度评价,且三个模型运行结果均没有河西走廊(地理区划)空间尺度上表现良好;三个模型的尺度效应明显,在地理区划空间尺度上应用较良好,缩小至市域空间尺度上模拟结果误差增大;不同空间尺度上,最大熵模型均优于多准则决策模型和信息量模型,适用于地理区划(大中)、市域(小)空间尺度的山洪灾害风险评价。
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