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缓解集中流影响的植被缓冲带优化 策略探讨
杨渊,王天星,蔡心怡,江明艳*
0
()
摘要:
集中流的存在与频繁发生使河岸水文过程呈现特殊性与不确定性,影响植被缓冲带环境及其生态效应的发挥。针对集中流破坏植被缓冲带环境与土壤结构、抵消水质净化功能等问题,以植被类型与配置、河岸地形和驳岸处理为主要考虑因素,提出了前端、中端、末端3个空间层次的植被缓冲带优化策略:前端散流结构以“减速分流”为优化原则,包括草地过滤带、梢捆、灌木树篱和石头堰4种优化技术;中端渗透系统以“渗透吸收”为优化原则,包括3种土壤环境(黏土、壤土、砂土)的植物选型技术和2种微地形(微盆地、梯级地形)处理技术;末端驳岸形式以“固土净化”为优化原则,包括“草本+灌木”型、“活枝柴笼+灌丛垫”型和“植物+石块”型3种优化形式。植被缓冲带优化技术参数的量化、中端渗透系统优化技术的探索,以及植被缓冲带生态功能与景观、生活价值的结合将是进一步研究的方向。
关键词:  风景园林  集中流  植被缓冲带  散流结构  渗透系统  驳岸形式
DOI:
基金项目:
Discussion on the Optimization Strategies of Vegetation Buffer Strip for Alleviating the Influence of Concentrated Flow
YANG Yuan,WANG Tianxing,CAI Xinyi,JIANG Mingyan
()
Abstract:
The existence and frequent occurrence of concentrated flow make the river bank hydrological process showing particularity and uncertainty, affecting the environment of vegetation buffer strip and its ecological effects. Taking the vegetation types and configurations, riparian topography and revetment treatments as major considerations, this paper proposes optimization strategies of the vegetation buffer strip on three spatial hierarchies at the front, middle and terminal when concentrated on the problems of concentrated flow destroying vegetation buffer strip environment and soil structure and counteracting the water purification function. The front diffused structure is optimized according to the principle of "deceleration shunting", including four kinds of optimization techniques: grassland filter, fascine, shrub hedge and stone weir. Based on the principle of "osmotic absorption", the middle osmosis system consists of plant selection techniques in three soil environments (clay, loam and sand) and two kinds of micro-topography (micro-basin and step-topography). The terminal revetment form takes "soil fixing and purifying" as the optimized principle, which is comprised of three optimization forms of "grass + shrub", "live fascine + brush mattress" and "vegetation + stone". Quantification of optimum technical parameters of vegetation buffer strip, exploration of middle osmotic system optimization techniques, and the combination of ecological function with landscape and life value of vegetation buffer strip will be the main directions for further study.
Key words:  landscape architecture  concentrated flow path  vegetation buffer strip  diffused structure  osmosis system  revetment form

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