摘要
河道的纵向连通性反映了河道上下游物质和能量的传递能力,对区域的水资源、防洪、生态等方面有着重要影响。研究基于西北江三角洲1958~2005年15个站点的月潮位统计数据,通过纵向连通性指标、分段线性回归方程等多种方法分析整体区域和主要河段上纵向连通性的变化特征,并结合相关分析方法探讨其成因。结果表明:(1)1958~2005年间,西北江网河区大部分河道的纵向连通性呈现明显的"先降后升"的阶段变化,变化的转折点为1982年;(2)西北江网河区纵向连通性与上游来水存在显著负相关关系,呈现出北江三角洲河道纵向连通性高于西江三角洲,非汛期高于汛期的规律;(3)网河区纵向连通性受到联围筑闸和河道挖沙等不同时期人类活动的影响,且河道所受人类活动的扰动越大,其连通性变化率相应也越大。研究结果可为西北江三角洲网河区河道生态修复及水资源管理提供参考。
The longitudinal connectivity of river channels reflects the transfer capacity of materials and energy between the upper and lower reaches of the river,playing an important role in the regional security of flood control and ecology.Based on the monthly tidal level statistics of 15 stations in the West and North River delta from 1958 to 2005,the water level difference between adjacent stations,piece-wise-linear regression were used to analyze the change in longitudinal connectivity of channels,and we in vestigated the correlation between the longitudinal connectivity and upstream flow and human activities with several methods.The results show that:(1)From 1958 to 2005,the longitudinal connectivity of most channels in the West and North River network was divided into two obvious stages of‘first drop and then rise’,and the turning point was in 1982.(2)The longitudinal connectivity had a significant negative correlation with upstream inflow,which showed the law that the longitudinal connectivity of the river channel in North River Delta is higher than that in West River Delta,and the non-flood season is higher than the flood season.(3)The longitudinal connectivity was greatly affected by human activities such as floodgate construction and sand excavation in different periods in the studied area.And it turned out that the greater the disturbance caused by human activities,the greater the change rate of longitudinal connectivity.The results could provide further reference for river ecological restoration and water resources management in the West and North River delta.
作者
朱晨春
陈晓宏
杨杰
白文魁
ZHU Chenchun;CHEN Xiaohong;YANG Jie;BAI Wenkui(School of Geography and Planning,Sun Yat-sen University,Guangzhou 510275,China;Center for Water Resources and Environment,Sun Yat-sen University,Guangzhou 510275,China;Gaungdong Engineering Technology Research Center of Water Security Regulation and Control for Southern China,Sun Yat-sen University,Guangzhou 510275,China;Land Reserve Center of Pengjiang District,Jiangmen 529000,China)
出处
《水文》
CSCD
北大核心
2020年第6期68-74,共7页
Journal of China Hydrology
基金
国家自然科学基金项目(U1911204,51861125203,91547202)。
关键词
纵向连通性
西北江三角洲
水位
人类活动
上游来水
longitudinal connectivity
West and North River Delta
water level
human activities
upstream runoff
