The co-location of offshore windfarms and decapod fisheries in the UK: Constraints and opportunities     

《Marine Policy》2014

The offshore wind sector in the UK is expanding rapidly and is set to occupy significant areas of the coastal zone, making it necessary to explore the potential for co-location with other economic activities. The presence of turbine foundations introduces hard substrates into areas previously dominated by soft sediments, implying that artificial reef effects may occur, with potential benefits for fisheries. This review focuses on the possibilities for locating fisheries for two commercially important decapods, the brown crab Cancer pagurus and the European lobster Homarus gammarus, within offshore wind farms.Existing understanding of habitat use by C. pagurus and H. gammarus suggests that turbine foundations have the potential to act as artificial reefs, although the responses of these species to noise and electromagnetic fields are poorly understood. Offshore wind farm monitoring programmes provide very limited information, but do suggest that adult C. pagurus associate with turbine foundations, which may also serve as nursery areas. There was insufficient deployment and monitoring of rock armouring to draw conclusions about the association of H. gammarus with offshore wind farm foundations. The limited information currently available demonstrates the need for further research into the ecological and socio-economic issues surrounding fishery co-location potential.  相似文献   

我国海岸潟湖卫星遥感分类方法研究   总被引：1，自引：0，他引：1       下载免费PDF全文

孙伟富  张杰  马毅  夏东兴 《海洋科学进展》2014,32(3)

参照Landsat-5TM和HJ-1CCD遥感影像,依据实地踏勘资料及解译经验,分析各种海岸潟湖地貌学成因和发育演变阶段,提出基于潟湖地貌学成因的遥感分类方法。并将我国海岸潟湖划分为滨外坝型、沙坝型、沙嘴型、湾顶坝型、连岛坝型和河口型共6种地貌类型。建立基于发育演变阶段的潟湖遥感分类标准,将海岸潟湖分为青壮年期、老年期和死亡期共3个发育演变过程;结合潟湖在影像中的特征,以近红外、红、绿波段组合后的假彩色影像为例,从色彩、纹理、地物邻接关系等方面建立不同潟湖类型的遥感解译标志;根据所建立的遥感解译标志,对山东省53个海岸潟湖进行遥感分类验证,结果吻合。  相似文献   

渤海海峡跨海通道区浅地层结构探测   总被引：2，自引：0，他引：2       下载免费PDF全文

赵铁虎  高小惠  齐君 《海洋测绘》2014,(2):38-42

在对2012年渤海海峡跨海通道区实测浅地层剖面资料进行地质解释的基础上,通过将浅地层剖面与钻孔地层岩性划分进行对比,标定了标准反射界面,通过对浅地层剖面各反射波组、内部反射结构的追踪、对比分析以及测线间的闭合检查,划分出5个主要反射界面和4个声学地层单元,揭示了各地层单元的分布特征。对拟建跨海通道路线选区典型探测剖面进行了系统的分析、讨论。  相似文献   

世界各国草地资源管理体制及其对我国的启示   总被引：2，自引：0，他引：2  

唐海萍  陈姣  房飞 《国土资源情报》2014,(10):9-17

草地在世界各大洲均有分布,世界各国对草地资源的管理有着不同的体制与策略.本文梳理了各大洲主要国家的草地资源管理体制,分析了草地资源管理历史进程与趋势,总结了各国草地资源管理的优势和可资借鉴之处.结合我国草地资源管理中存在的问题,建议我国要在国家层面重视草地资源的管理,建立专门行政部门管理全国60忆亩草地,建立健全现有的草地资源管理体制,同时建立草原质量的监测数据网络,并加强对草地利用的监管力度.  相似文献   

南美典型铁矿床遥感找矿模型研究     

黄爽  陈圣波  查逢丽  李艳秋 《世界地质》2014,33(4):946-951

针对南美地区两种典型铁矿—苏比利尔湖型和阿尔果玛型铁矿,基于ETM+遥感数据,采用光谱角方法提取研究区的羟基、铁染蚀变信息;通过影像增强,波段合成等预处理结合人工解译,进行赋矿地层和控矿构造信息提取。总结分析示矿信息规律和特征,建立遥感找矿模型,圈定2处遥感找矿靶区,缩小了野外地质调查范围。  相似文献   

基于铜陵矿集区遥感影像的地质解译及成矿远景区圈定研究     

祁轶宏  张明明  陈庆 《安徽地质》2014,(2):127-130

本文对铜陵矿集区的landsat 7 ETM+遥感影像进行综合分析,获取影像波谱特性,运用波段比值和主成分分析的方法提取铁染和羟基蚀变信息,利用彩色密度分割得到蚀变异常图像,清晰显示铜陵矿集区的成矿有利区域。并对遥感解译结果和铜陵地区地质构造与现有矿点对比,验证提取结果。圈定的11个成矿有利区域中:3个A类区蚀变信息明显,具备有利成矿条件,成矿潜力巨大;4个B类区蚀变信息中等,具备有利成矿条件,具有一定成矿潜力;4个C类区蚀变信息离散,成矿条件不明显,具有成矿可能,但是潜力不大。  相似文献   

基于开源GIS构建矿区物探资料二维可视化软件     

张伟  ;廖国忠  ;覃庆炎 《物探与化探》2014,(5):1064-1069

国外优秀的综合物探资料处理解释软件一个共同优点是面向用户提供一个功能强大、界面友好、可视化强的数据管理模块。笔者在分析了Winglink、Emigma、Geosoft等软件中数据管理模块的优缺点基础上,从解剖、仿制的角度出发,提出了以开源GIS平台为核心的快速构建综合物探资料二维可视化管理模块的技术方案,并详细阐述了其相关功能模块的技术原理和实现过程。实际应用效果表明,本技术方案是可行的,且具有低成本、高效率、低技术难度、开放性强的优点。  相似文献   

Improvement of groundwater resources potential by artificial recharge technique: A case study of Charf El Akab aquifer in the Tangier region,Morocco     

SADIKI Moulay Lhassan  EL MANSOURI Bouabid  BENSEDDIK Badr  CHAO Jamal  KILI Malika  EL MEZOUARY Lhoussaine 《地下水科学与工程》2014,7(3):224-236

In arid and semi-arid zones, water is the most vulnerable resource to climate change. In fact, various techniques such as artificial recharge are adopted to restore aquifers and to ensure aquifer sustainability in relation to the accelerated pace of exploitation. Morocco is a Mediterranean country highly vulnerable to climate change, many of its main aquifers are subjected to excessive drawdowns. This technique is practiced to increase potentiality of these aquifers. In the Northwestern area of Morocco, the significant development experienced by Tangier City in the industrial, tourism, and commercial sectors will lead to increased water requirements-up to 5 067 L/s (159.8 mm3) by 2030. However, the Charf El Akab aquifer system, subject to artificial recharge, is the only groundwater resource of Tangier region; hence, a rational management context is needed to ensure aquifer sustainability, and optimized exploitation under the background of differing constraints, such as increased water requirements, and climate change impacts. This work aims to respond, for the first time, to the Charf El Akab aquifer overexploitation problem, and to evaluate the future scenarios of its exploitation in the event of failure of one of the superficial resources. This work also presents a synthesized hydrodynamic modeling based on the results of the numerical simulations carried out using Feflow software for 2004 (date of cessation of injections) and 2011 (date of resumption of these facilities), making it possible to evaluate the impact of the artificial recharge on the piezometric level of the aquifer on a spatiotemporal scale. Finally, the exploitation scenarios have shown that the aquifer of Charf El Akab will not adequatly provide for the region's water requirements on the future horizon, entailing an optimal management of water resources in the region and an intentionally increased recharge rate.  相似文献   

激光扫描实时获取水下图象信息的方法与系统   总被引：1，自引：1，他引：0  

郑冰  李欣  谭锐  王国宇 《中国海洋大学学报(自然科学版)》2000,30(4)

报道一种实时大视角、全景深获取水下图象的新方法。该方法试图解决在无人摇控潜器(ROV)和自治式潜器 (UUV)走航式获取水下清晰图象时 ,遇到的激光在水下传输过程中后向散射噪声问题 ,建立了一种具有宽视角、全景深性能的水下激光扫描系统。用这种方法和系统在空气中和水中做了大量的实验 ,并讨论了这种方法和系统的应用前景。  相似文献   

一种基于改进CoHOG的视觉SLAM算法     

于尧  孙新柱  郭俊阳  陈孟元 《测绘通报》2022,(12):42-50

移动机器人在SLAM的闭环检测环节计算量大、运行时间长、匹配误差大,从而导致闭环检测精度较低。针对该问题,本文在CoHOG闭环检测算法的基础上进行改进,将算法中的HOG描述符改进为GDF-HOG描述符,以增强图像特征表现,提高图像特征提取效率;在匹配环节前添加GDF-HOG全局粗匹配,以减少视觉模板的数量,提高算法的计算效率;在匹配环节后添加感兴趣区域（ROI）位置匹配进行检验,以减少闭环检测的假阳性,提高准确率。将本文闭环检测算法与RatSLAM相结合,在公开数据集与真实环境中进行测试,测试结果表明,本文算法在闭环检测环节的准确率较高,且对环境的适应能力较强。  相似文献