地理学报 ›› 2020, Vol. 75 ›› Issue (9): 1921-1933.doi: 10.11821/dlxb202009008
收稿日期:
2019-05-15
修回日期:
2020-04-05
出版日期:
2020-09-25
发布日期:
2020-11-25
作者简介:
袁玉(1992-), 男, 安徽淮南人, 博士生, 研究方向为景观生态风险评估, 土地资源与水资源的利用与评价。E-mail: 基金资助:
YUAN Yu(), FANG Guohua, LU Chengxuan, YAN Min
Received:
2019-05-15
Revised:
2020-04-05
Online:
2020-09-25
Published:
2020-11-25
Supported by:
摘要:
以秦淮河流域为例,构建HEC-HMS模型,采用统计学分析方法,在两期历史景观分布情况下,研究洪水特征值(洪量、洪峰)与不同景观的景观格局指数间的响应关系,提出并构建基于景观格局的洪水生态风险(洪水—景观生态风险)指数,结合空间分析方法,进行全流域风险的时空变化分析和特征子流域间的对比分析。结果表明:不同类型景观的景观格局与洪水特征值间均具有一定程度的响应关系,景观类型不同,其响应指标与程度不同;2003—2017年,研究区风险程度有所增加,空间差异明显;景观格局对区域洪水影响显著,避免景观的大面积聚集发展,增加各类景观周边的景观丰富度,提高景观间的接触面积,有助于减弱城市化进程中建设用地景观面积增加带来的洪水危害,发挥景观的生态正效应。
袁玉, 方国华, 陆承璇, 颜敏. 基于景观生态学的城市化背景下洪灾风险评估[J]. 地理学报, 2020, 75(9): 1921-1933.
YUAN Yu, FANG Guohua, LU Chengxuan, YAN Min. Flood risk assessment under the background of urbanization based on landscape ecology[J]. Acta Geographica Sinica, 2020, 75(9): 1921-1933.
表2
HEC-HMS模型模拟11场洪水的评价指标结果"
洪号 | 景观分布年份 | R | NSE | Dv(%) | Dp(%) | |
---|---|---|---|---|---|---|
率定期 | 19870630 | 1988 | 0.96 | 0.91 | 3.53 | -9.23 |
19930618 | 1994 | 0.94 | 0.86 | 25.44 | 0.39 | |
20030626 | 2003 | 0.98 | 0.87 | 22.88 | 12.84 | |
20080615 | 2010 | 0.99 | 0.99 | 7.66 | 3.85 | |
验证期 | 19870819 | 1988 | 0.95 | 0.81 | 18.27 | 13.64 |
19910629 | 1988 | 0.83 | 0.80 | -3.81 | 20.21 | |
19960623 | 1994 | 0.99 | 0.89 | 29.32 | 2.60 | |
19990622 | 1999 | 0.95 | 0.82 | 29.25 | 7.87 | |
20020618 | 2003 | 0.98 | 0.96 | -0.29 | -6.95 | |
20060718 | 2003 | 0.98 | 0.89 | 21.11 | 19.50 | |
20150712 | 2017 | 0.95 | 0.88 | 0.77 | -7.36 |
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