摘要
明晰平原河网水系结构和功能的影响机制对区域生态可持续发展具有重要意义。以昆山市南部防洪分区为例,选取水系指标分析圩区单元尺度下的水系网络结构与调蓄功能,并构建贝叶斯网络模型,综合考虑用地、自然、工程与政策管理等因子及其相互作用,定量探究水系结构与功能的影响机制。结果表明:(1)水系网络结构具有显著空间异质性,且水系调蓄功能与结构特征密切相关,较复杂的水系形态结构往往表现出较强的调蓄功能;(2)政策、工程、用地和自然条件等因子对水系调蓄功能的影响强度依次减弱;(3)识别水系功能优化目标下的关键变量与关键状态子集,可从社会⁃生态协同视角指导圩区单元的水系治理与优化。研究结果可为平原圩区水系网络健康与可持续发展提供理论参考和决策依据。
River networks are important vehicles for water systems to maintain ecosystem health and sustainability.Especially,in plain areas with dense river networks,the river network pattern,the function of hydrological regulation and storage,as well as its complex influence mechanisms,are of great significance to the regional sustainable development.Taking the southern flood district of Kunshan City,as an example,five river network indexes at polder embankment units were introduced and analyzed in 2018:the water ratio,the river network density,the structural connectivityγindex,the river storage capacity per unit area,and the river retention capacity per unit area,to evaluate the river network structure and storage function.The Bayesian Belief Network model(BBN),a methodology based on casual⁃effect relationships,was applied to explore the influence mechanisms of the river network structure and function,by comprehensively considering social⁃ecological variables,such as land use cover,environment condition,hydraulic engineering construction,as well as policy governance and planning.The results showed:(1)The river network structure has significant spatial heterogeneity.The northern polder area is mostly lower than that in the central and southern regions,the river density in the central and western polder areas was significantly lower than the average level;besides,overall structure connectivity is moderate as compared to middle⁃low reach of Yangtze River plain,with relatively low value in urbanized polder embankments.(2)The difference in the storage function of river network is closely related to its structural characteristics.There are several polder embankments in the southwest and central study area that displayed complex morphological structure,and their river storage capacities per unit area is correspondingly high,showing a strong flood regulation and storage function.(3)The structural characteristics of river network can significantly affect the flood regulation function in polder embankments,and the influence
作者
周可婧
孔繁花
庄雪颖
班玉龙
尹海伟
杨子健
宋小虎
ZHOU Kejing;KONG Fanhua;ZHUANG Xueying;BAN Yulong;YIN Haiwei;YANG Zijian;SONG Xiaohu(Department of Geography and Ocean Sciences,Nanjing University,Nanjing 210023,China;Kunshan Water Bureau,Kunshan 215300,China;Department of Architecture and Urban Planning,Nanjing University,Nanjing 210093,China;Yangzhou Jiangdu Ecological and Environmental Bureau,Yangzhou 225200,China;Jiangsu Surveying&Mapping Engineering Institute,Nanjing 210013,China)
出处
《生态学报》
CAS
CSCD
北大核心
2024年第8期3268-3279,共12页
Acta Ecologica Sinica
基金
国家重点研发计划项目(2022YFF1303102)
昆山市河湖生态空间格局优化方案项目(RHZH2022⁃KS⁃Y⁃02⁃06)。
关键词
平原圩区
水系结构与功能
贝叶斯网络模型
影响机制分析
plain polder area
structure and function of river network
Bayesian Belief Network model
influencing mechanism
