Heavy metals contamination levels at the Coast of Aliağa (Turkey) ship recycling zone   总被引：1，自引：0，他引：1  

Neşer G  Kontas A  Unsalan D  Uluturhan E  Altay O  Darılmaz E  Küçüksezgin F  Tekoğul N  Yercan F 《Marine pollution bulletin》2012,64(4):882-887

Alia?a Bay is one of the most important maritime zones of Turkey where shipping activity, shipbreaking industry, steel works and petrochemical complexes exist together. Concentrations of heavy metals and organic carbon in sediment of the Alia?a Bay were investigated to evaluate an environmental risk assessment from metals contamination in 2009-2010. Comparison of the metal concentrations with average shale and Mediterranean background levels revealed that most of the samples from the Alia?a were polluted with Hg, Cd, Pb, Cr, Cu, Zn, Mn and Ni. It was found that Hg, Pb, Cu, Zn and Ni levels in Alia?a Bay exceeded the PEL values. Sediments, contaminated with Pb, Cr, Cu, Zn and Ni were considered as heavily polluted per the SQG.  相似文献   

The cumulative impacts of reclamation and dredging on the marine ecology and land-use in the Kingdom of Bahrain   总被引：1，自引：0，他引：1  

Zainal K  Al-Madany I  Al-Sayed H  Khamis A  Al Shuhaby S  Al Hisaby A  Elhoussiny W  Khalaf E 《Marine pollution bulletin》2012,64(7):1452-1458

This article assesses the ecological and economic impacts of land reclamation and dredging through consulting recent environmental impact assessment reports. Geographic features of Bahrain during 1963-2008 are produced using Geographical Information System. Extensive but inexpensive shallow coastal areas and tidal flats have been reclaimed particularly from 1997 to 2007 at a high rate of 21 km(2)/year. Formal records show the increase in the original land mass by the year 2008 to be 91 km(2). An estimated total cumulative loss of major habitats resulting from 10 reclamation projects was around 153.58 km(2). Also much larger scale impacts should be considered resulting from the borrow areas used for the extraction of sand or infill materials. A number of key habitats and species are affected in the vicinity of these projects. The study attempts to assign a monetary value to the marine ecosystem functions. There is a need for efficient coastal zone management to regulate a sustainable use of the marine resources.  相似文献   

Testing benthic foraminiferal distributions as a contemporary quantitative approach to biomonitoring estuarine heavy metal pollution     

Foster WJ  Armynot du Châtelet E  Rogerson M 《Marine pollution bulletin》2012,64(5):1039-1048

Biomonitoring of estuarine pollution is the subject of active research, and benthic foraminifera are an attractive group to use for these purposes due to their ubiquitous presence in saline water and wide diversity. Here, we describe a case study of biomonitoring using benthic foraminifera in the French Mediterranean lagoon, Bages-Sigean lagoon. In this case, the major pollutants of interest are heavy metals in the sediment, particularly contaminated by Cu and Cd derived from industrial and agricultural sources. The foraminiferal assemblages of the Bages-Sigean lagoon are typical of normal paralic environments, but unusually almost completely lack agglutinated forms. The density of benthic foraminifera was shown to be more influenced by the sediment characteristics rather than heavy metal pollution. However, the relative abundance of Quinqueloculina bicostata was shown to increase in the most polluted areas and we propose that this taxon may be used as an indicator of heavy metal pollution.  相似文献   

2010年M_W8.8智利地震:多段触发及含频率的破裂特点     

E．Kiser  M．Ishii  康瑞清译  何钧校  吕春来复校 《世界地震译丛》2012,(3):1-7

2010年2月27日智利MW8.8地震的多频率反投影结果揭示出此次地震是由具有不同滑动特征的子事件组成的。震中以南的子事件以低频(0.05～0.1Hz)释放能量,意味着滑动缓慢,且破裂速度约为0.8km/s。震中以北的2个子事件则显示出以高频(1～5Hz)释放能量的特征。其中第一个子事件似乎触发了北边第2段的滑动,并且释放了较高振幅的能量,传播速度也快,约为2.9km/s。除了这些破裂的细节之外,还观测到如下现象:在破裂前沿,高频能量释放之后紧接着产生了低频能量释放。这一发现表明:大震对应的破裂过程蕴含着断层的动态弱化,因此,它们的破裂特性并非简单地与小地震的特性相关。这些明显的滑动特点表明:有必要对宽频域各种数据进行研究,以便全面评估巨大地震的破裂过程及相关灾害。  相似文献   

Natural resources depletion in hill areas of Bangladesh: A review   总被引：1，自引：1，他引：0  

Shampa BISWAS  Mark E.SWANSON  Harald VACIK 《山地科学学报》2012,9(2):147-156

Hilly or mountainous terrain occupies around 12% of the area of Bangladesh.Natural resources associated with Bangladesh’s hill are forest resources,biodiversity,minerals,and agricultural crops.Natural resources have been exploited in the recent four decades due to excessive clearing of hill forest cover,resulting in loss of species richness, impacts related to increased water flow variability, increased hill slope erosion and flooding intensity, and a gradual decrease in the extent of hill area in Bangladesh.This review explores the major causes and effects of depletion of natural resources by linking drivers,pressures and the related impacts.A review has been conducted to structure the effects on the hilly areas and describe the responses to minimize them in the associated DPSIR framework.Population growth has been identified as a major driver contributing to high deforestation rates.This may negatively effect agricultural productivity and increase the frequency of serious flooding.Slash and burn cultivation also impacts the regeneration of evergreen forests,which may accelerate soil erosion. Due to this and other factors,local people are facing a deficits of natural resources(food,fodder,fuel wood and water),which exacerbates the effects of poverty. Future research should try to facilitate decision making for sustainable utilization of natural resources management in the hilly areas of Bangladesh. Additional conservation measures should be developed to increase the resilience of ecosystems at national and regional levels.  相似文献   

润泽“旱片” 助力“三农”——象州县罗秀镇潘村土地整治促进农业增收小记     

黎俊彦  盘军吉 《南方国土资源》2013,(5):17-19

2013年3月,天气逐渐变暖,在这温暖的春天里象州县罗秀镇潘村村民饭后都要到田地里散步。这一现象让人觉得奇怪,因为农村田间小道坑洼不平,散步的话肯定弄得一身脏,影响饭后的好心情,为啥他们要出去散步呢?这得益于桂中农村土地整治项目实施后,该村基础设施发生了翻天覆地的改变,水泥路直通家门口,村民们  相似文献   

流溪河流域土地利用景观生态安全动态分析   总被引：8，自引：0，他引：8  

吉冬青  文雅  魏建兵*  吴志峰  程炯  刘庆 《热带地理》2013,33(3):299-306

在GIS技术支持下,基于景观干扰指数和景观脆弱度指数构建景观生态安全评价指标体系,分析流溪河流域2000年、2005年和2009年3相土地利用景观生态安全变化。景观生态安全指数定量化地表征了流域景观生态安全状况,结果表明：（1）流域景观生态安全格局受城市化及人类活动干扰显著增强,林草地和耕地面积减少,园地面积增加,10年间各景观类型的破碎度、分离度总体呈现增加趋势,且流域内优势景观类型发生改变,2000年和2005年以林草地和耕地为优势景观,而2009年优势景观转变为林草地和园地;（2）2000-2005年,流域过半景观生态安全格局发生了变化;2005-2009年期间流域景观生态安全转移率约为60%,约有90%的流域景观生态安全格局在空间分布上发生了变化;（3）2000年整个流域景观生态安全指数都大于0.6,其中大于0.8的面积占99.99%;2005年,生态安全度大于0.6的面积比例为98.48%,景观生态安全指数大于0.8的面积较2000年降低55.93%;景观生态安全度大于0.6的区域2009年比2005年减少了72.93%,主要分布于流域上游;整个流域范围内没有生态安全指数大于0.8的区域分布,流域景观生态安全度呈现整体降低趋势。  相似文献   

全球寒武系年代地层再划分的新建议   总被引：15，自引：6，他引：9  

彭善池  L.E.Babcock 《地层学杂志》2005,29(1):92-93,96

介绍最近提交国际地层委员会寒武系分会的全球寒武系年代地层划分方案 ,划分为 4个统级单位和 10个阶级单位 ,同时提出划分芙蓉统的两个新点位 ,即球接子类三叶虫 Agnostote orientalis和 L otagnostusamericanus的首现。  相似文献   

无人机遥感众创时代   总被引：2，自引：0，他引：2  

廖小罕  周成虎  苏奋振  卢海英  岳焕印  缑吉平 《地球信息科学学报》2016,18(11):1439-1448

当代科技发展降低了无人机和遥感器的准入门槛。大众参与为无人机遥感领域注入了巨大的创造力,触发了无人机遥感创新发展的爆发式增长。当前,无人机已成为普适化和平民化的科学手段,无人机遥感数据在众多领域和部门呈现出取代通航遥感和卫星遥感数据的趋势。本文首先对无人机遥感所处的时代特征及其展现的科技特色进行了分析与归纳,然后列举了无人机遥感在抗震救灾、岛礁测绘、极地科考、精准农田管理等领域开展的典型应用,最后从无人机发展所致遥感数据供应结构性调整、无人机遥感地理学研究推动、遥感无人机试验场地布局等方面进行了展望。特别地,针对无人机遥感应用量大面广、数据分布多源异构等特点,本文提出了无人机遥感数据航母的概念。  相似文献   

长三角装备制造业产学研创新网络体系的演化分析   总被引：3，自引：2，他引：1  

吕国庆  曾刚  郭金龙 《地理科学》2014,34(9):1051-1059

利用国家重点产业专利信息服务平台,对长三角装备制造业联合申请发明专利数据进行检索,绘制了长三角地区企业、厂、公司与高校、科研机构之间的产学研创新网络,从节点、部类、城市、区域等4个层面,采用中心度、网络密度等网络结构指标,对1985~2010年长三角装备制造业产学研创新网络的结构及空间特征进行分析。研究发现,长三角装备制造业产学研创新网络的演化具有明显的阶段性特征,中心度较高的成员多为高校,区域内各城市的产学研空间分异特征明显,地理邻近、行政邻近及知识规模邻近是影响行为主体建立创新合作联系重要的因素,网络建构处于初级阶段。  相似文献