城镇化下平原水系变化及河网连通性影响研究

发布时间：2018-02-03 10:39

本文关键词： 水系变化水系连通平原河网城镇化　出处：《长江流域资源与环境》2017年03期 　论文类型：期刊论文

【摘要】：针对平原区城镇化背景下水系减少及连通受阻等下垫面变化引起的洪涝加剧问题,综合考虑水系结构和水力特性等因素,建立满足行洪排涝需求的平原水系连通度量方法,并以浙东沿海平原河网区为例,分析了城镇化下平原水系特征变化及其对河网连通度的影响。结果表明:1近20a来研究区水系数量和结构复杂性均存在不同程度的衰减,河网密度和水面率分别减少20%和30%左右,水系尤其是低等级河道的减少导致河网结构趋于骨干化;2河网连通度受水面率等数量特征和水系空间连接结构的共同影响,在水系数量持续减少情况下,整个河网连通度呈现先减少后增加的趋势,说明了骨干河道工程对水系空间结构特征的优化,可缓解水系减弱对河网连通的负面效应;3建立的河网连通度方法合理反映了水系数量和结构变化下的河网连通度演变规律,以及水系变化下区域排涝能力的空间差异特征,具有操作性强特点。
[Abstract]:In view of the problem of increasing flood caused by the change of underlying surface such as decrease of water system and obstruction of connectivity under the background of urbanization in plain area, the factors such as water system structure and hydraulic characteristics are considered synthetically. A method to measure the connectivity of the river system in the plain is established to meet the needs of flood discharge and drainage, and a case study is made of the river network in the coastal plain of eastern Zhejiang Province. The characteristics of plain water system and its influence on the connectivity of river network under urbanization are analyzed. The results show that the quantity and structural complexity of river system in the study area in the past 20 years have been attenuated to different degrees in the past 20 years. The density of river network and water surface rate decreased by about 20% and 30% respectively, and the decrease of river system, especially the low grade river, led to the backbone of river network structure. (2) the connectivity of river network is affected by the quantitative characteristics of water surface rate and the spatial connection structure of water system. When the number of river system decreases continuously, the connectivity of the whole river network decreases first and then increases. It is shown that the optimization of the spatial structure of the river system by the backbone river engineering can alleviate the negative effects of the weakening of the river system on the connectivity of the river network. 3The established method of river network connectivity reasonably reflects the evolution law of river network connectivity under the change of the quantity and structure of river system, and the spatial difference characteristics of regional drainage ability under the change of water system, and has the characteristics of strong maneuverability.
【作者单位】：盐城工学院环境科学与工程学院;南京大学地理与海洋科学学院;
【基金】：国家自然科学基金项目(41401035) 水利部公益性行业科研专项经费项目(201301075) 江苏省高校自然科学基金项目(l4KJB170021)~~
【分类号】：TV213;P343
【正文快照】： 平原河网区水系众多,水系在增加河流系统蓄泄能力,减轻洪水灾害中发挥着重要的作用。随着城镇规模的扩张,人口向城市的聚集,城镇化等人类活动在改变河流结构发育演变中的作用不断增强,水系变化研究已成为水文学、水力学等相关学科的热点问题之一[1,2]。近年来国内外学者就平原

【相似文献】