Uncertainties of landslide susceptibility prediction: influences of different study area scales and mapping unit scales

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-04-05 DOI:10.1007/s40789-024-00678-w
Faming Huang, Yu Cao, Wenbin Li, Filippo Catani, Guquan Song, Jinsong Huang, Changshi Yu
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Abstract

This study aims to investigate the effects of different mapping unit scales and study area scales on the uncertainty rules of landslide susceptibility prediction (LSP). To illustrate various study area scales, Ganzhou City in China, its eastern region (Ganzhou East), and Ruijin County in Ganzhou East were chosen. Different mapping unit scales are represented by grid units with spatial resolution of 30 and 60 m, as well as slope units that were extracted by multi-scale segmentation method. The 3855 landslide locations and 21 typical environmental factors in Ganzhou City are first determined to create spatial datasets with input-outputs. Then, landslide susceptibility maps (LSMs) of Ganzhou City, Ganzhou East and Ruijin County are produced using a support vector machine (SVM) and random forest (RF), respectively. The LSMs of the above three regions are then extracted by mask from the LSM of Ganzhou City, along with the LSMs of Ruijin County from Ganzhou East. Additionally, LSMs of Ruijin at various mapping unit scales are generated in accordance. Accuracy and landslide susceptibility indexes (LSIs) distribution are used to express LSP uncertainties. The LSP uncertainties under grid units significantly decrease as study area scales decrease from Ganzhou City, Ganzhou East to Ruijin County, whereas those under slope units are less affected by study area scales. Of course, attentions should also be paid to the broader representativeness of large study areas. The LSP accuracy of slope units increases by about 6%–10% compared with those under grid units with 30 m and 60 m resolution in the same study area's scale. The significance of environmental factors exhibits an averaging trend as study area scale increases from small to large. The importance of environmental factors varies greatly with the 60 m grid unit, but it tends to be consistent to some extent in the 30 m grid unit and the slope unit.

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滑坡易发性预测的不确定性:不同研究区域尺度和绘图单位尺度的影响
摘要 本研究旨在探讨不同测绘单位尺度和研究区尺度对滑坡易损性预测(LSP)不确定性规则的影响。为说明不同的研究区域尺度,选择了中国赣州市及其东部地区(赣州东部)和赣州东部的瑞金县。不同的测绘单元尺度由空间分辨率为 30 米和 60 米的网格单元以及通过多尺度分割方法提取的边坡单元来表示。首先确定赣州市 3855 个滑坡点和 21 个典型环境因子,建立输入-输出空间数据集。然后,利用支持向量机(SVM)和随机森林(RF)分别绘制了赣州市、赣州市东部和瑞金县的滑坡易损性图(LSM)。然后通过掩膜从赣州市的 LSM 中提取上述三个地区的 LSM,并从赣州东部的 LSM 中提取瑞金县的 LSM。此外,还根据不同的测绘单元比例尺生成了瑞金的 LSM。精度和滑坡易感性指数(LSIs)分布用于表示 LSP 不确定性。从赣州市、赣州市东部到瑞金县,随着研究区域尺度的减小,网格单元下的 LSP 不确定性明显减小,而坡度单元下的 LSP 不确定性受研究区域尺度的影响较小。当然,还应注意大面积研究区的广泛代表性。在相同的研究区域尺度下,边坡单元的 LSP 精度比分辨率为 30 米和 60 米的网格单元下的 LSP 精度提高了约 6%-10%。随着研究区域规模从小到大的增加,环境因素的重要性呈平均趋势。在 60 米网格单元下,环境因子的重要性差异很大,但在 30 米网格单元和坡度单元下,环境因子的重要性在一定程度上趋于一致。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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