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黄骅港外航道泥沙问题的治理及其效果 总被引:1,自引:0,他引:1
黄骅港航道泥沙骤淤问题是港口发展的主要障碍,在现场观测资料、动力条件、泥沙环境和淤积成因分析的基础上,介绍了黄骅港航道泥沙问题治理的研究方法、整治工程后的淤积情况和实际效果。结合几年来参与黄骅港泥沙研究工作,介绍了研究过程中的经验和体会,包括关于海岸的性质划分、粉沙质海岸航道骤淤的条件和泥沙运动形式、粉沙质海岸泥沙研究的特点和粉沙质海岸航道泥沙骤淤的治理。 相似文献
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<正>本刊从交通运输部天津水运工程科学研究院获悉,交通运输部天津水运工程科学研究院"粉沙质海岸泥沙运动规律研究及工程应用"成果获得2014年度国家科技进步二等奖。该成果依托黄骅港和京唐港区等重大港口工程建设,系统地开展了粉沙质海岸泥沙水力特性、运移形态、淤积规律、航道治理方法及工程应用研究,解决了粉沙质海岸港口建设与发展的瓶颈问题。该成果已成功应用于黄骅港、京唐港、潍坊港、滨州港、东营港以及国外巴基斯坦瓜达尔港、印尼AWAR电厂码头等港口工程中,研究成果纳入《海港水文规 相似文献
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阜阳水系综合治理项目包含颍河凤凰湿地建设,凤凰湿地在颍河边滩布置挺水植物和沉水植物等,形成边滩植被水流的形态。通过由实验室实测数据验证过的边滩双层植被(分别模拟挺水植物、沉水植物)的流速分布解析解,推求颍河凤凰湿地的流速分布。结合流速分布结果,对工程的防冲设计进行验证,为边滩生态湿地项目的设计提供了边滩植被水流计算方法。 相似文献
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There is increasing concern regarding the impacts of recreational four-wheel driving (4WDing) on sandy beach environments. The ghost crab Ocypode cordimanus is a widely distributed Australian species that utilizes beaches and dunes for constructing burrows and for foraging. Comparisons of ghost crab abundances (using burrow counts) in areas “open” and “closed” to recreational 4WDing were conducted on exposed sandy beaches on North Stradbroke Island, off the coast of southeast Queensland. Beaches where recreational 4WD activity is present had significantly lower ghost crab abundances than beaches where it is absent. The most plausible reason for this difference in abundance is that ghost crabs are highly vulnerable to being crushed by beach traffic when feeding on the beach at night. To mitigate the impacts of recreational 4WDing on ghost crab population management intervention is needed. Possible changes to the management of recreational 4WD activity include the setting aside of areas free of recreational 4WD activity for the conservation of biodiversity, or a prohibition on driving on the beaches between dusk and dawn. There is also a need for a consistent and transparent approach in Queensland for quantifying and monitoring 4WD activity in sandy beach environments. 相似文献
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Driving of off-road vehicles (ORVs) on sandy beaches is common and widespread, but is not universally embraced due to putative environmental impacts on beach biota. For ORVs to impact the beach fauna, traffic areas must overlap with faunal habitat: a fundamental pre-requisite for impact assessments but as yet un-quantified for sandy beaches. Thus, this study quantified the spatial and temporal patterns of ORV traffic on five Australian beaches, and measured the degree to which the distribution of intertidal macro-invertebrates overlaps with traffic zones. Traffic volumes on beaches can be considerable (up to 500 vehicles per day). The position of beach traffic across the beach-face is principally governed by tides and driver behavior. Despite driver education campaigns to the contrary, a considerable fraction of vehicles (16–67%) traverses the soft, upper shore near the foredunes. The majority (65%) of burrowing invertebrate species of the intertidal zone is directly exposed to traffic, save for species inhabiting the swash zone. Because beach traffic presents a formidable management challenge, a fundamental first step in identifying whether ecological impacts are indeed likely, is to assess the potential for spatial and temporal conflict between human pressures (e.g., ORVs) and biological resources (e.g., beach fauna). Although this potential is certainly substantial for sandy shores used by ORVs, the actual ecological impacts on the intertidal fauna can only be predicted in situations where the responses (e.g., direct mortality, behavioral changes) of individual species to beach traffic are known. 相似文献
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Ourania Tzoraki Isavela N. Monioudi Adonis F. Velegrakis Nicolaos Moutafis Gerasimos Pavlogeorgatos Dimitra Kitsiou 《Coastal management》2018,46(2):78-102
This contribution addresses the need for a simple model for managers to employ when planning strategies for the management of touristic beaches under sea level rise. A methodological framework was developed and tested in two Aegean archipelago islands (Lesvos and Rhodes, Greece). The scheme can represent the status of touristic island beaches, based on easily obtained variables/indicators and projections of beach erosion/retreat under different scenarios of mean sea level rise (MSLR) and extreme events. Information on beach geomorphological characteristics, environmental setting, water quality, management, and services (such as those used in the “Blue Flag” classification) was collated/collected and beach erosion/retreat due to CV & C was estimated through suitable ensembles of cross-shore (1-D) morphodynamic models. A Strength-Weaknesses-Opportunities-Threats (SWOT) framework was employed to assist in the selection of indicators and multicriteria analysis used to optimize indicator weights and rank beaches according to their sustainability under sea level rise. Implementation of the framework at the two islands has shown that: the majority of Lesvos and Rhodes beaches (82% of a total of 217 beaches and 58% of a total of 97 beaches, respectively) can be classified as beaches with no, or minimal, human interference, suggesting that under environmentally sound coastal management further touristic development might be afforded; there could be very significant effects of the sea level rise on the carrying and buffering capacities of the most developed (“Blue Flag”) beaches, with some expected even under conservative projections to be completely eroded by 2100, unless technical adaptation measures are taken; and using the proposed framework, touristic beaches can be rapidly ranked in terms of their resilience to sea level rise and their development potential, allowing prioritization of effective management responses. 相似文献
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长江中游河段河床多为沙质,河床演变剧烈,受两岸石山、矶头和人工护岸工程等节点控制,上下游河段演变具有明显的关联性特征.以牧鹅洲水道为例,对其演变特征及其与下游湖广水道的关联特性进行分析,基于目前航道的不利变化趋势,结合已实施航道整治工程对本河段整治方案进行研究.通过在牧鹅洲水道实施护滩工程,同时解决牧鹅洲边滩中低滩冲刷... 相似文献
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根据沙波床面底沙运动特点,引用二阶Stokes波浪理论,推导出波浪作用下沙波运行速度计算公式,并给出沙波床面上底沙输移的计算公式.公式计算结果与水槽试验结果吻合很好. 相似文献
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Coastal erosion threatens many sandy beaches and the ecological, economic, social and cultural amenities they provide. The problem is especially chronic in South Florida. A frequent solution for beach restoration involves sand replacement, or nourishment, but is temporary, expensive, and has usually been funded by governmental sources. However, as such agencies reduce their share and require more local funding, beach nourishment must rely on other funding sources, including beach recreationists. Our study characterized three South Florida beaches and probed visitor willingness-to-pay for beach nourishment. We found that even beaches within close proximity attract different user types. Users are amenable to higher fees if they lead to greater resource protection. 相似文献
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The public presently owns, or has the right to use, a substantial portion of the nation's ocean beaches. However, the public cannot, in fact, use many of these beaches because there is no legal access to them. As the coast develops, more and more areas become closed to the public. The states are now being encouraged to plan for access to the beaches; there are a number of tools and techniques at their disposal. 相似文献
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The U.S. national beach nourishment experience is summarized for the East Coast barrier islands, the Gulf of Mexico, New England, and the Great Lakes. A total of 1,305 nourishment episodes on 382 beaches are recorded at a total estimated cost of approximately $1.4 billion ($2.5 billion in 1996 dollars). In terms of both volume and costs, nourishment has been the most extensive by far on the East Coast barrier islands. Depending on the region, between 65% and 85% of all nourishment projects have a federal funding component. Annual expenditures and sand volumes for beach nourishment are increasing, especially on East Coast barriers. At present, total annual national beach nourishment costs (excluding the Pacific Coast) are on the order of $100 million per year. The cost per cubic yard of nourishment sand as expressed in 1996 dollars has remained more or less constant over time. Additionally, the volumes of sand needed for subsequent nourishment episodes on individual beaches do not decrease, despite contrary assumptions in the shoreface-profile-ofequilibrium concept that subsequent nourishment volumes should diminish. In light of the historical experience of beach nourishment identified in this study, individual state and local coastal communities should reevaluate their plans for future beach nourishment programs. The complete listing of all the data on nourished beaches from this survey is available at www.geo.duke.edu/Research/psds/psds.htm 相似文献