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汕尾电厂煤港工程泥沙问题研究 总被引：1，自引：0，他引：1
通过实测水文泥沙资料、岸滩冲瘀演变分析、泥沙计算、泥沙物理模型试验等手段对汕尾电厂煤港工程泥沙问题进行了研究。通过研究，了解了煤港工程海域--后江湾的水文泥沙基本特征、泥沙来源和泥沙运动规律，找出了煤港工程泥沙淤积成因，预报了煤港工程方案的泥沙淤积量，从泥沙淤积角度论证了煤港建设的可行性。 相似文献
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通过对唐山港京唐港区附近海岸演变进行调查和分析,结合唐山港京唐港区建港近二十年的现场观测资料,对港区附近的泥沙运动和港口航道泥沙淤积机理进行分析,对2003年10月强风暴潮期间,港口航道发生严重的泥沙骤於进行了研究,为解决港口航道特别是外航道的泥沙淤积问题,提出粉沙质海岸港区航道挡沙和固沙的工程措施,并通过物理模型对挡沙固沙措施的工程效果进行了模型试验。试验结果表明挡沙和固沙工程方案对航道泥沙减淤效果很明显,其中,挡沙方案目前已应用到唐山港京唐港区二期挡沙堤改造、三期挡沙堤的设计和建设工程中,已发挥其挡沙减淤的作用。 相似文献
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考虑波浪辐射应力对潮流场和泥沙运动的影响,建立了青岛港前湾三期码头前沿挡沙堤工程二维潮流泥沙数学模型。在采用实测资料验证的基础上,运用模型对本海域在无挡沙堤及不同挡沙堤长的各种方案的流场变化和泥沙回淤情况进行计算研究。结果表明,无挡沙堤时,由于三期工程的建设缩窄了河口至海区的断面面积,断面西侧的浅水区水流速度增大,容易掀起泥沙输移至断面东侧开挖后的深水区,使泥沙在码头前港池中落淤,码头前沿最大淤积强度约为0.818 m/day;而建设挡沙堤后将显著减小码头前沿的泥沙淤积。经过比较,从挡沙堤附近流场与港池航道回淤情况的角度考虑,认为方案二对码头前沿拦沙的效果较好。 相似文献
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泥质河口闸下冲淤特性及冲淤量的分析预报 总被引：10，自引：2，他引：10
通过泥质河口建闸工程闸下淤积特性的分析研究表明,闸下河段淤积的条件是涨潮流带入河段的泥沙数量大于落潮流从河段内带走的泥沙数量。其水动力原因是径流量减小和潮波变形。在此基础上提出了建闸工程和建闸与双导堤相结合闸下淤积和冲刷的分析预报方法,这些冲淤分析预报方法得到了相关工程的实测资料及浑水动床物模试验结果的验证。 相似文献
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本文通过实测资料，分析了黄河清水沟流路入海泥沙淤积在三角洲陆上和滨海以及漂向外海的泥沙分配，统计了三角洲淤积造陆沿岸线的淤积延伸宽度以及泥沙在滨海水下的淤积范围，并对潮流和余流引起的泥沙扩散进行了分析。 相似文献
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长江口北支泥沙的淤积和冲刷问题,对北支的开发利用至关重要,本文拟对北支的泥沙淤冲变化条件及相应的工程措施作初步的分析探讨。 相似文献
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黄河口清水沟流路泥沙淤积分布及扩散 总被引：5，自引：0，他引：5
本文通过实例资料，分析了黄河清水沟流路入海泥沙淤积在三角洲陆上和滨海以及漂向外海的泥沙分配，统计了三角洲淤积沿岸线的淤积延伸宽度以及泥沙在滨海水下的淤积范围，并对潮流和余流引起的泥沙扩散进行了分析。 相似文献
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《Marine Policy》2016
Temporary marine area closures or more permanent Marine Protected Areas are being proposed as potential options in ecosystem-based marine spatial management. These policy options are known to displace fishing effort. In this paper, EU Vessel Monitoring System (VMS) data is combined with other site and vessel information and used to model the fishing site choice decision of Irish demersal otter trawlers. Uniquely, the fishing ground options used in the analysis reflect the actual seabed contours trawled by the fleet. The fishing site choice model, based on this natural site definition is compared to an alternative destination choice model where the fleet decision is specified using a grid based site definition as employed in previous work. It is argued that the natural site specification is a more realistic specification of the fisher site choice decision. Using the preferred natural fishing site choice model, a policy scenario involving the hypothetical closure of one of the fishing ground options is then simulated to examine the possible redistribution of fishing effort. 相似文献
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《Marine Policy》2014
This paper summarises research and options for sustainable sea transport in Oceania with a focus on domestic shipping. This debate is situated initially within the context of the current Pacific domestic shipping scenario, a region of minute economies connected by some of the longest sea transport routes in the world. All current options are fossil fuel powered and increasingly uneconomic and unsustainable. Many routes are marginal or unviable and a vicious cycle of old ships replaced with old ships prevails. Although a central and essential issue of many Pacific communities, the option of pursuing sustainable sea transport is currently invisible within the policy space at all levels. Various renewable energy options are possible and increasingly available. Recent research finds that these have strong potential for providing benefits across multiple wellbeings. The barriers to pursing this agenda are complex and poorly understood but are perceptual and institutional more than technological. A small number of critical experiments during the last oil crisis provide critical lessons and direction. 相似文献
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Sean Pascoe Rodrigo Bustamante Chris Wilcox Mark Gibbs 《Ocean & Coastal Management》2009,52(2):130-138
In many circumstances, quantitative assessment of fisheries management options is either impossible due to data deficiencies or impractical given the size of the fishery. Quantitative analysis of spatial management options in particular is complicated, as information on spatial fleet and stock dynamics is often unavailable and spatial models are difficult to construct. In this paper, a qualitative framework is presented that aids in the analysis of alternative spatial management options in coastal fisheries. The framework combines expert opinion and the Analytic Hierarchy Process (AHP) to determine which options perform best taking into account the multiple objectives inherent in fisheries management. 相似文献
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Izvestiya, Atmospheric and Oceanic Physics - This article shows the possibility of using the SRTM model to search for the best options for detailed ground-based engineering surveys in flat treeless... 相似文献
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The authors identify a management approach to the problem of incidental catch and utilize that approach to evaluate six management options which are being considered to control incidental catch in the US fishery conservation zone of the Bering Sea. The evaluation is in terms of the ability of management to minimize the impact and control costs of incidental catch. The authors conclude that the use of economic disincentives tends to be preferable due to the inefficiencies and extensive information requirements of the alternative options. 相似文献
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This paper examines Canadians' willingness to pay to recover the populations of three marine mammal species found in the St Lawrence Estuary. The valuation approach utilized a stated preference tool that is somewhat a hybrid between contingent valuation and a choice experiment with multiple species recovery program options and choices framed as referenda. Program options involved the use of a marine protected area and restrictions on whale watching and shipping industries. The estimated willingness to pay (WTP) for different levels of marine mammal recovery ranged from $77 to $229 per year per household and varied according to the species affected and the recovery program effort. A series of tests revealed that people would be willing to pay more for programs that contribute to greater increases in marine mammal populations, but the additional value of programs that improve a species status beyond the “at risk” threshold is relatively small. 相似文献
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José Guerreiro Aldo Chircop Catarina Grilo Ana Viras Raquel Ribeiro Rudy van der Elst 《Marine Policy》2010
International conservation efforts and cooperation are increasingly necessary, particularly at an ecoregion level, for the achievement of international targets for protecting biodiversity and degradation of ecosystems. Whereas more than 11 percent of land is protected, less than 1 percent of marine space is similarly protected. Transboundary networks of marine protected areas and transboundary marine protected areas (TBMPAs) are an essential form of cooperation for meeting these international targets. This paper explores the diplomatic and political options for regional and sub-regional cooperation between Tanzania, Mozambique, and South Africa, for the establishment of transboundary conservation mechanisms in the Eastern African Marine Ecoregion (EAME). Five options for the establishment and management of these mechanisms are presented, together with actions to be taken to facilitate cooperation. The paper deal with a proposed strategy for the implementation of transboundary conservation mechanisms, focusing on TBMPAs, between the three countries at a biogeographical/sub-regional level, supported by lessons learnt in other transboundary marine conservation experiences. The paper concludes that although political will may exist among States sharing borders to establish TBMPAs, the complexity of dealing with sub-regional realities is a difficult obstacle to overcome in a single step. The situation at each border must be taken into account in order that different multi-scale and multivariate solutions, supported by a common baseline will ultimately converge in a common trilateral framework. Finally, a two-step approach seems to be in course with the declaration (October 2009) of a TBMPA linking Ponta do Ouro in Mozambique to iSimangaliso Wetland Park in South Africa, following one of the options formerly presented. 相似文献
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《Marine Policy》2013
A central challenge for natural resource management is developing rigorous yet practical approaches for balancing the costs and benefits of diverse human uses of ecosystems. Economic theory has a long history of evaluating tradeoffs in returns from different assets to identify optimal investment strategies. There has been recent progress applying this framework to the delivery of ecosystem services in land use planning. However, despite growing national and international interest in marine spatial planning, there is a lack of parallel frameworks in the marine realm. This paper reviews an ecosystem service tradeoff analysis framework and provides a more comprehensive synthesis for how it can be applied to marine spatial planning and marine ecosystem-based management. A tradeoff analysis approach can reveal inferior management options, demonstrate the benefits of comprehensive planning for multiple, interacting services over managing single services, and identify ‘compatible’ services that provide win–win management options. 相似文献
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《Marine Policy》2017
This paper outlines research on the sea transport need and potential options for the future for the islands of Gau, Batiki and Nairai, Southern Lomaiviti, Fiji. Sea transport is vital for this island group but is limited to infrequent commercial ferry services and outboard driven punts. The Fiji Government subsidises the ferries through its Shipping Franchise Scheme to ensure commercial operators service the route. The absence of commercial development within the group has meant high biodiversity and cultural values have been preserved and there are a number of projects, especially on Gau, with a common aim of building resilience or ‘climate change proofing’ the communities and their island environments. These projects are focused on supporting local communities to maintain well-being through improved reliance on local and natural assets. It is logical to add analysis of low carbon sea transport options to these initiatives. Lomaiviti has been selected as representative of a number of isolated Maritime Provinces in the Pacific. This paper is expected to pave the way for greater research in this field and assist in solving the crippling effect of the region's current fossil fuel dependency. 相似文献