Yao Ying-Ying, Huang Yan-He, Lin Jin-Shi, Jiang Fang-Shi, Guan Jia-Lin, Ji Xiang
School of Public Management, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Ying Yong Sheng Tai Xue Bao. 2022 May;33(5):1370-1376. doi: 10.13287/j.1001-9332.202205.020.
In order to understand the possibility and spatial pattern of Benggang (collapsing hill) erosion in risk assessment and distinguish the primary and secondary areas in Benggang prevention, we took a small watershed in Anxi County (Fujian, China) as the study area and Benggang as the source, and constructed the Benggang expansion resistance surface using the minimum cumulative resistance (MCR) model and divided the risk zoning. The results showed that the area around Benggang displayed a low resistance value, while the northwest and southeast areas displayed a high resistance value. The Benggang expansion resistance surface had an island type form. Based on resistance surface, the research region was divided into very high-risk, high-risk, medium risk, low-risk and very low-risk zones. We proposed corresponding Benggang management suggestions for those zones. A total of 21 strategic saddle points were extracted based on the resistance surface morphology. The strategic points in the lower safety zone were considered as the priority areas for Benggang prevention. We compared the hazard results based on the MCR model and the information quantity method. These results were consistent in spatial distribution, indicating the reliability of the results of hazard zoning by the MCR model.
为了在崩岗侵蚀风险评估中了解崩岗侵蚀发生的可能性及空间格局，区分崩岗防治的重点区域，选取福建省安溪县某小流域为研究区域，以崩岗为源地，利用最小累积阻力（MCR）模型构建崩岗扩展阻力面并进行风险分区。结果表明，崩岗周边区域阻力值较低，西北和东南区域阻力值较高，崩岗扩展阻力面呈岛状形态。基于阻力面将研究区域划分为极高风险区、高风险区、中风险区、低风险区和极低风险区，并针对不同分区提出相应的崩岗治理建议。基于阻力面形态共提取出21个战略鞍点，将安全等级较低区域的战略点作为崩岗防治的重点区域。对比了基于MCR模型和信息量法的危险性结果，二者在空间分布上具有一致性，表明MCR模型进行危险性分区结果的可靠性。
