Ecological risk assessment of trace metal accumulation in sediments of Veraval Harbor,Gujarat, Arabian Sea   总被引：1，自引：0，他引：1  

S. Sundararajan  Mukunda Kesari Khadanga  J. Prince Prakash Jeba Kumar  S. Raghumaran  R. Vijaya  Basanta Kumar Jena 《Marine pollution bulletin》2017,114(1):592-601

In this study, different types of indices were used to assess the ecological risk of trace metal contamination in sediments on the basis of sediment quality guidelines at Veraval Fishery Harbor. Sediment samples were collected from three sectors in pre-, post-, and monsoon seasons in 2006. Trace metal concentrations were higher in the inner sector during post-monsoon, and it showed the highest statistical significance (p < 0.01) among the stations. Pollution load index was higher than unity, indicating alternation by effluent discharge from industries. Enrichment factor and geo-accumulation index showed that Cd, Pb, and Zn were enriched in the northern part of the harbor and Pb had accumulated in the harbor sediment. The ecological risk assessment index revealed that Ni, Zn, and Pb were higher than the effect range median values, indicating their potential toxicity to the aquatic environment in the Veraval Harbor. Hence, the harbor is dominated by anthropogenic activities rather than natural process.  相似文献   

广西北海港石步岭港区项目风暴潮和海浪灾害风险评估          下载免费PDF全文

申友利  魏春雷  孙燕  高艳秋  马文韬 《海洋学研究》2019,37(3):55-63

近年来风暴潮等海洋灾害的频发,对沿海大型工程的防御能力提出了更高的要求。本研究结合广西北海港石步岭港区项目海岸防御工程的设计标准及现状,进行风暴潮和海浪灾害的风险性评估,把推算得到的防御工程应达到的理论顶高程与实测高程进行对比,评估该工程项目抵御海洋灾害的能力。研究发现考虑海平面上升之后的极端高潮位评估结果跟设计值相当;无论是设计高潮位还是极端高潮位下的N向波高的理论值均高于设计值;码头及其他防护岸段的实测最低高程均低于考虑波浪爬高影响之后的理论顶高程,存在一定风险,建议项目业主单位立即采取措施以降低海洋灾害风险。  相似文献   

近22年来象山港海域水环境变化趋势及R/S预测研究   总被引：2，自引：0，他引：2  

张丽旭  赵敏  付旭强  蔡燕红 《海洋湖沼通报》2010,(1)

选择CODMn、DIN、PO4-P作为反映象山港海域水环境状况的主要环境参数,建立22 a来(1984—2005)象山港海域CODMn、DIN和PO4-P年平均浓度的时间序列,用平均差值法、最小二乘法和自回归滑动平均法3种趋势分析方法,统计检验了其变化趋势,并用重标极差分析法(R/S分析法),预测了在当前情景下象山港海域未来各项水环境参数的变化趋势特征。结果表明:近22 a来象山港海域CODMn年平均浓度则呈降低的趋势,而DIN和PO4-P的年平均浓度则呈增加的趋势,CODMn降低比DIN和PO4-P增加更明显;根据R/S预测分析,未来象山港海域CODMn的降低趋势可能会出现逆转,呈现升高的趋势,而DIN和PO4-P可能仍将保持逐渐升高的趋势,N:P比值将会进一步扩大,N和P的比例失调状况会进一步加剧。  相似文献   

Long-term monitoring using resident and caged mussels in Boston Harbor yield similar spatial and temporal trends in chemical contamination     

Carlton D. Hunt  Elizabeth Slone 《Marine environmental research》2010,70(5):343

Measurements of chemical contaminants in caged (transplanted) and resident mussel populations have become a routine tool for monitoring and assessing the status and trends of coastal water quality. However, few long-term data sets are available to assess the comparability and efficacy of these two monitoring approaches. Three long-term independent data sets exist for Boston Harbor: the National Mussel Watch program has analyzed resident blue mussels (Mytilus edulis) from the Boston Harbor/Massachusetts Bay region for over twenty years, the Massachusetts Water Resources Authority has annually deployed caged (transplanted) mussels (M. edulis) to assess bioaccumulation potential of sewage effluent discharged under its NPDES permit for over fourteen years, and the GulfWatch program has analyzed resident blue mussel populations for over twelve years. Together, these data provide consistent and comparable information on temporal and spatial changes in chemical contamination in Boston Harbor as steps were taken to reduce contaminant loading. The data also demonstrate the complementary nature of resident and caged (transplanted) mussels for assessing contaminant trends even when the basic approaches and sampling frequency differ. These fifteen-year data sets demonstrate contaminant concentrations in mussels from Boston Harbor are similar and with few exceptions have significantly decreased since the early 1990s. The observed trends also demonstrate broad scale improvements to the quality of Boston Harbor and expand understanding of the response of coastal systems to interventions that reduce the load of chemicals to the ocean.  相似文献   

Numerical investigation of oscillations within a harbor of parabolic bottom induced by water surface disturbances     

《Applied Ocean Research》2016

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九龙江口海沧港区17～-18^#码头基槽浮泥成因分析     

汪卫国  曹慧美  郑勇玲 《台湾海峡》2009,28(1):82-89

九龙江口海沧港区因建设17—18^#泊位而开挖的基槽处发育厚层浮泥．通过对该处浮泥及其周边的水体悬浮颗粒、海底表层和沉积物柱状样的激光粒度分析，发现浮泥的颗粒物主要由峰值粒径在7～10μm的粘土粉砂质细颗粒组分构成，但在浮泥层的下部还含有小部分峰值粒径为200—500μm的砂质粗颗粒组分．浮泥中细颗粒组分的粒度特征和水体中的悬浮颗粒、底质沉积物中的细颗粒组分一致，而浮泥中粗颗粒组分的粒度特征，和九龙江口洪水事件成因的中粗砂的粒度特征一致．结合现场调访和水文观测，得出17—18^#泊位基槽处浮泥的成因主要受海沧港区建设过程中产生的大量再悬浮泥沙以及受水下地形的影响，水动力条件适宜悬浮泥沙在17—18^#泊位基槽处聚淤．此外，台风引发的洪水也是增加悬浮泥沙含量的辅助因素．随着海沧港区的建成，水动力条件的改变，17～18^#泊位港池及调头区浮泥的厚度将小于基槽区浮泥厚度．  相似文献   

Analysis of atmospheric turbidity levels at Taichung Harbor near the Taiwan Strait     

Chih-Chung Wen  Hui-Hsuan Yeh 《Atmospheric Research》2009,94(2):168-177

In this study, two universal turbidity parameters, the Angstrom turbidity coefficient and Linke turbidity factor, are applied to study the atmospheric turbidity characteristics of Taichung Harbor. Meteorological parameter values were measured during 2004 and 2005 at the Wuchi weather station of the Taiwan Central Weather Bureau, near the Taiwan Strait. Results based on the Angstrom turbidity models (β_Lou, β_Pin, and β_Vis) indicated that annual mean values of the Angstrom turbidity coefficients were 0.174, 0.21 and 0.201, respectively. Four sets of Linke turbidity factors (T_Lin, T_Lou, T_Pin and T_Vis) were calculated using the original Linke method and the Dogniaux method, incorporating the computed Angstrom turbidity coefficients (β_Lou, β_Pin and β_Vis); the resultant values were 4.30, 6.40, 7.10 and 6.95, respectively. The monthly average values, frequency of occurrence, and cumulative frequency distributions were calculated using different models to describe the clear-sky atmospheric conditions at Taichung Harbor. The frequency results show that for over 50% of the dataset, three sets of Angstrom turbidity coefficients fell between 0.15 and 0.18, and four sets of Linke turbidity factors (T_Lin, T_Lou, T_Pin and T_Vis) fell between 4.0 and 6.5. Thus, for 50% of cloudless days, the sky can be between turbid and clear over Taichung Harbor. Furthermore, the results reveal that for 30% of the dataset, three Angstrom sets of turbidity coefficients (β_Lou, β_Pin, and β_Vis) exceed 0.2 and four sets of Linke turbidity factors (T_Lin, T_Lou, T_Pin and T_Vis) exceed 5.0. This indicates that 30% of cloudless sky conditions can be considered turbid to very turbid.  相似文献   

湛江港南三岛近岸海区异养细菌数量变动与潮汐周期关系研究     

刘志刚  韩建新  黄海立 《广东海洋大学学报》1996,(1)

研究了南三岛近岸海区异养细菌数量变动与潮汐周期的关系。结果表明：在２４ｈ内异养细菌的数量随着潮位的上升而减少或随着潮位的下降而增加，高平潮时数量最低，低平潮时数量最高。比较一个月内各个高平潮异养细菌的数量，发现异养菌数量在小潮期向大潮期转变的过程中达到顶峰，并在大潮期急剧下降至最低值，接着从大潮期至小潮期，异养细菌数量缓慢回升，直至小潮期后才快速地上升。在水平分布中，异养细菌的数量在潮间带最大，其次是离低潮线１００ｍ的海区，离低潮线３００ｍ的海区最小。在垂直分布中．异养细菌数量以表层水最高，中层水次之，底层水最低。  相似文献   

洋山港海域与长江口相似性研究   总被引：11，自引：0，他引：11  

李玉中  陈沈良 《地理学报》2002,57(6):662-670

根据洋山港海域的水文泥沙观测资料和长江口的研究文献分析，洋山港海域与长江口存在较多相似现象。2者均存在滞流区现象是产生其它相似现象的根本原因。即高悬沙浓度区分布特征，表层沉积特征和浅滩区分布特征的相似性是滞流区现象的衍生效应。洋山港海域与长江口的诸多相似现象揭示：（1）滞流区的动力平衡作用是最大浑浊带和拦门沙浅滩形成的主导因素；（2）滞沙区通常位于滞流区地形束窄一侧；（3）滞流区的细颗粒物质沉积区与滞流点位置（或滞流区形态）有着较为一致的吻合性，洋山港海域与长江口区间属于未来开发的热点地区，对2者的相似现象开展深入的研究将有着较深的理论和实际意义。  相似文献   

湛江港潮汐汊道落潮三角洲沉积动力过程   总被引：6，自引：1，他引：6  

张乔民  郑德延 《地理学报》1995,50(5):421-429

湛江港是华南海岩规模最大的中潮溺谷湾型潮汊道港湾，口外发育规模巨大、形态典型的落潮三角洲。依据据现场调查资料分析，落潮三角洲具有马蹄形浅滩包围中央深槽的地貌结构，由中心至周边为粗砂至极细砂同心半圆带状分布的表层沉积分布，中央深槽落潮流动力为主，周边浅滩波潮流动力为主的动力场结构。  相似文献