福建省三沙湾海洋生态环境质量综合评价   总被引：6，自引：2，他引：6       下载免费PDF全文

蔡清海  杜琦  钱小明  许翠娅 《海洋学报》2007,29(2):156-160

三沙湾(由东吾洋、官井洋和三都澳等几个部分组成)位于福建省东北部沿海,四周群山环抱,海岸线曲折,水域辽阔,是个天然良港.三沙湾历史上水质优良,水产资源丰富,是中国著名的大黄鱼产卵场,曾经有许多洄游性经济类鱼虾在这里产卵繁育.但近些年来富营养化问题日趋严重,赤潮时有发生,给三沙湾的环境生态造成了危害.过去对三沙湾的水体和沉积环境虽有研究[1~3],但对其生态环境质量的综合研究尚未见报道.  相似文献   

n Agriculture97-98F323.7J149     

《海洋学研究》2007,(1)

  相似文献   

大鹏湾的赤潮生态仿真模型   总被引：20，自引：3，他引：20  

夏综万  于斌  史键辉  王寿松 《海洋与湖沼》1997,28(5):468-474

通过海洋动力学和赤潮生物动力学相结合的方法，建立了一个赤潮发生的仿真模型。模型包括水动力、扩用和生物动力学三部分，综合考虑了潮流、营养物质等环境要素的时空变化对赤潮过程的影响，并以大鹏湾夜光藻赤潮为例进行了数值模拟。模型再现了赤潮发生前海水中营养物质的浓度一次明显的增高，而在赤潮发育盛期营养物质降至低谷的现象并反映了赤潮物质容易在海湾的角落等水交换不畅的地域聚集的情况。  相似文献   

Phosphorus and nitrogen cyclings in the pelagic system of hiroshima bay: Results of numerical model simulation     

Jutarat Kittiwanich  Tamiji Yamamoto  Toshiya Hashimoto  Keiko Tsuji  Osamu Kawaguchi 《Journal of Oceanography》2006,62(4):493-509

A numerical ecosystem model expressing both phosphorus and nitrogen cyclings in the pelagic system of Hiroshima Bay, Japan, was developed in order to investigate the seasonal variations of these elements and their annual budgets. Based on the geophysical and chemical structures of the bay, Hiroshima Bay was divided into northern and southern boxes, themselves divided into two layers of an upper 5 m and a lower layer according to the stratification of the water column. The model consists of equations representing all relevant physical and biological processes. The results revealed that the internal regeneration of materials was an important source of bioavailable nutrients for phytoplankton growth in the water column. The incorporation of phytoplankton aggregation improved the accuracy of the outputs in comparison to the observed data, especially during the stratified summer season. The results also indicated that phosphorus limitation of phytoplankton growth occurs in the upper layer during summer while light limitation occurs in the lower layer. In addition, physical processes such as diffusion and advection were also important as they ensured that most of regenerated nutrients in the lower layer were transported to the upper layer. Thus, these processes might support the high primary production and the production of oysters that are extensively cultured in this bay. Considering the informative results obtained, the model used in this study provides a sound basis and tool to describe the dynamics of phosphorus and nitrogen cyclings in Hiroshima Bay.  相似文献   

Reproductive success of Calanus pacificus during diatom blooms in Dabob Bay, Washington   总被引：1，自引：4，他引：1  

James J. Pierson  Claudia Halsband-Lenk  Andrew W. Leising 《Progress in Oceanography》2005,67(3-4):314

While numerous laboratory studies in the last decade have shown that diatoms can induce reproductive failure in copepods, field evidence for a negative diatom effect is equivocal. To unambiguously elucidate the effects diatoms have on copepod reproduction in situ, we undertook a study of the abundance, distribution, grazing rates, and reproductive success of Calanus pacificus in Dabob Bay, Washington, USA, during two spring bloom periods. We simultaneously measured the phytoplankton composition, abundance, and distribution. Here we present results for the reproductive success of C. pacificus using four measurements: egg production rate, clutch size, egg hatching success, and naupliar survival (to the first feeding stage). Egg production rate was positively correlated with chlorophyll a concentration, and egg hatching success and naupliar survival were usually greater than 80%. However, in February 2002 and 2003 – during blooms of diatoms of the genus Thalassiosira – either egg hatching success, naupliar survival, or both were significantly depressed compared to other times in spring and summer. These effects, combined with evidence that C. pacificus was grazing aldehyde-producing Thalassiosira at the time of their blooms, indicate that diatoms can negatively affect copepod reproduction in the field, albeit only under specific circumstances and for brief periods.  相似文献   

杭州湾跨海大桥桥位地形测绘中的潮位改正     

陈尚州  张奠梅 《海洋学研究》2002,20(4):30-34

在杭州湾跨海大桥桥位地形测绘中,采用三角分带解析法进行潮位改正计算,结果表明:合理布设潮位站、合理安排测量时间,可以提高地形测量精度,正确地进行潮位计算。一般应在高平潮前后3h时间内施测,可保证浅滩不出现测量空白区。地形测绘过程中还应布设不少于主测线数量的5%的检查线,以检查其测量精度。在所测的河口湾两岸潮位明显不等时,采用三角分带解析法进行潮位改正计算,其结果合理、正确,可达到规范的要求。  相似文献   

海南岛三亚湾现代沉积环境   总被引：2，自引：0，他引：2  

毛龙江  张永战  张振克  魏灵  季小梅  朱大奎 《海洋地质与第四纪地质》2007,27(4):17-22

海南岛三亚湾海滩沉积物主要以中细砂为主,中值粒径在2.0~2.5Φ之间,为细砂质,少量样品在1.0~2.0Φ之间,属中砂质,适合于海滩旅游。近岸海底沉积物总体分布较细,为砂-粉砂-黏土的组合,仅仅在海湾西侧靠近岬角处,以中粗砂为主。近岸海底沉积物是低海平面时古河道的堆积物,能够为现代海滩提供很好的砂源,为确保海滩的稳定性提供了物质前提条件。但是,由于近20年的海岸开发,海滩东部受到人类开发活动的深刻影响,人为排放的有机物污染使海滩部分出现泥化和变黑,而且,由于人为的违规建筑物紧逼高潮线和大潮高潮线,破坏海滩的整体形态,改变海岸的动力条件,进而破坏了海滩旅游资源。  相似文献   

南极普里兹湾海域水文特征研究──夏季温、盐分布特征及底层水形成的探讨     

周培强  孙日彦 《中国海洋大学学报(自然科学版)》1995,(4)

分析普里兹湾及其附近海域温、盐分布特征，提出在艾默里冰架外侧有一片温暖水域。指出：１、变性极大的南极绕极深层水的前沿混合水可以影响到陆架上的南纬６７°左右；２、在两个“ＣＴＤ”探头直达海底的测站，深层观测到了温度为负值、盐度为３４．６７。据此，作者指出该水体属于南极底层水。此外，还对整个海区的跃层现象进行分类，计算了跃层的强度、厚度和深度。  相似文献   

Eiefsis Bay Anoxia: Nutrient Conditions and Benthic Community Structure     

Nikolaos  Friligos Argyro  Zenetos 《Marine Ecology》1988,9(4):273-290

Abstract. The changes in the concentrations of silicate, phosphate, and inorganic nitrogen in Eiefsis Bay. an intermittently anoxic basin, arc described and related to the changes in the physical properties of the water. Winter convection resulted in a very small vertical gradient of temperature, salinity, oxygen, and nutrients. Stratification started to develop in May and persisted for about 6 months. High values of silicate, phosphate, and ammonia occurred during the anoxic conditions prevailing in summer. The vertical transport of particulate organic matter and decomposition of abundant pelagic and benthic organic matter during the summer produced a low oxygen level in the bottom layer below the pycnoclinc. A high sea water temperature and vertical stability contributed to the development of anoxic conditions during the summer in the near bottom layer and to mass mortality of benthic macrofauna. Also the Eiefsis Bay anoxia appears to have had significant ecological effects on many other marine species, including several of economic importance.  相似文献   

杭州湾地区末次冰盛期第一硬质黏土层粒度特征及其环境意义   总被引：1，自引：0，他引：1  

刘锐  郑洪波 《海洋地质与第四纪地质》2006,26(6):27-34

对于沉积物粒度分布特征的研究是衡量沉积介质能量,判别沉积地理环境和水动力条件的最基本方法之一。对杭州湾地区河姆渡钻孔的末次冰盛期第一硬质黏土层样品进行系统的粒度分析,并与典型黄土、古土壤、下蜀土及河流相、湖相样品进行对比后发现,该层位样品所显示的粒度分布特征与湖相沉积物极为相似,而与下蜀土及河流相沉积物有所差别。从粒度分布的角度推断,该区第一硬质黏土层的沉积环境为河湖相。  相似文献