濂水流域景观生态风险变化对洪水的影响

盛菲; 刘士余; 戴余典; 关兴中; 卢静媛

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中国环境科学 ›› 2023, Vol. 43 ›› Issue (10) : 5466-5474.

环境生态

濂水流域景观生态风险变化对洪水的影响

盛菲¹, 刘士余¹, 戴余典¹, 关兴中², 卢静媛²

作者信息 +

Impact of landscape ecological risk change on flood in Lianshui watershed

SHENG Fei¹, LIU Shi-yu¹, DAI Yu-dian¹, GUAN Xing-zhong², LU Jing-yuan²

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文章历史 +

摘要

以赣南濂水流域为研究区，分析1995~2020年流域的景观格局变化以及全流域、子流域尺度的景观生态风险时空变化特征，采用HEC-HMS模型模拟流域120场暴雨在1995、2005年景观格局情景下的洪水过程，并借助Spearman相关分析探究景观生态风险变化对洪水的影响.结果显示：有林地始终为流域内面积占比最高的景观类型，其他林地在1995~2005年变化剧烈，建设用地在2005~2020年增幅较大.在全流域尺度，1995、2005、2020年的景观生态风险指数平均值分别为0.0621、0.0543、0.0532，景观生态风险整体呈下降趋势，主要由高等级向低等级转变；在子流域尺度，W170、W180、W210、W260子流域的景观生态风险呈下降趋势，W140、W230子流域先减后增，W220子流域先增后减；景观生态风险在1995~2005年的变化更为强烈.景观生态风险指数变化率与洪峰流量、洪水总量变化率相关系数箱型图的平均值分别为0.616、0.603，景观生态风险变化对洪水影响较大，且对洪峰流量的影响整体高于洪水总量.

Abstract

The Lianshui watershed located in southern Jiangxi province was selected to examine changes in landscape pattern from 1995 to 2020, as well as the temporal and spatial variation characteristics of landscape ecological risk at both the whole watershed and sub-watershed scales. The HEC-HMS model was utilized to simulate the flood process of 120 rainstorm events in the studied watershed under different landscape pattern scenarios for 1995 and 2005. Furthermore, Spearman correlation analysis was conducted to investigate the influence of changes in landscape ecological risk on floods. The results revealed that forested land constituted the primary landscape type with the highest area proportion within the watershed. However, other woodland experienced significant changes between 1995 and 2005, while construction land exhibited a substantial increase from 2005 to 2020. At the whole watershed scale, average values of the landscape ecological risk index were found to be 0.0621 (in 1995), 0.0543 (in 2005), and 0.0532 (in 2020), indicating a decreasing trend in overall landscape ecological risk, transforming from high level to low level. At a more detailed sub-watershed scale analysis, it was observed that certain sub-watersheds such as W170, W180, W210, and W260 displayed a downward trend regarding their respective levels of landscape ecological risk over time. However, W140 and W230 exhibited a dynamic change pattern characterized by an initial decrease followed by an increase. Finally, W220 demonstrated an opposite trend with an initial increase followed by a subsequent decrease. The period between 1995 and 2005 witnessed dramatic shifts in terms of landscape ecological risk levels. The average correlation coefficient values depicted in the box plots between the rate of change in the landscape ecological risk index and the rate of change in peak flow and total flood volume were 0.616and 0.603, respectively. The fluctuations observed in the landscape ecological risk within the watershed had a significant impact on flooding, with a greater influence on peak flow compared to total flood volume.

导出引用

盛菲, 刘士余, 戴余典, 关兴中, 卢静媛. 濂水流域景观生态风险变化对洪水的影响[J]. 中国环境科学. 2023, 43(10): 5466-5474

SHENG Fei, LIU Shi-yu, DAI Yu-dian, GUAN Xing-zhong, LU Jing-yuan. Impact of landscape ecological risk change on flood in Lianshui watershed[J]. China Environmental Science. 2023, 43(10): 5466-5474

中图分类号： X826

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