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排序方式： 共有83条查询结果，搜索用时 31 毫秒
31.
《Geodinamica Acta》2013,26(5-6):209-223
The 2.4 ka shoreline evolution on the Island of Vis has been investigated. It represents a particularly interesting area for this kind of investigation due to the existence of the submerged archaeological remains, the antique port of Issa, as well as to the existence of geomorphological and biological sea-level markers. The actual depths of the different parts of the submerged quay have been mapped and measured with respect to the present mean sea-level, applying corrections for tide and atmospheric pressure values at the time of the surveys. The functional heights related to the sea level at the time of construction have also been taken into account. These data were further compared with predictions derived from a glacio-hydro-isostatic model associated with the Last Glacial cycle. During the investigation of the coast, tidal notches and algal rims were found. They were mapped, measured and correlated with results of the submerged port remains, as well as with other available data along the Croatian coast. Our results demonstrate a 199±25 cm sea-level change during 2.4 ka on the Island of Vis. Taking into account the total relative sea-level change, an average rate of around ~0.83 mm/yr is derived. If the isostatic-eustatic component is separated, a tectonic subsidence rate ranges between 0.17 and 0.3 mm/yr depending on the predicted model used. Compared to the Northern Adriatic area, the Island of Vis shows a much smaller component of tectonic subsidence. 相似文献
32.
David Roper 《新西兰海洋与淡水研究杂志》2013,47(4):487-498
Abstract Benthos near a sewage outfall discharging 69 000 m3 d?1 of municipal sewage into Tauranga Harbour was studied to determine the nature and extent of the impact caused by a small organic input. Sediment samples were collected about the outfall and analysed for particle size, sorting, mud content, readily oxidisable carbon (ROC), total Kjeldahl nitrogen (TKN), total phosphorus (TP), “oil and grease” (OG), and macroinvertebrates. It is concluded that observed patterns of physical sediment characteristics are mainly natural. Levels of ROC, TKN, TP, and OG were all highest at or nearby the outfall. However, chemical changes in the sediment related to the discharge seemed to be limited to within less than 50 m distance of the outfall. The distributions of ROC, TKN, and TP in the sediments were closely related to natural changes in mud content. The outfall had little effect on the distribution of total numbers of taxa or individuals, or the composition of macro‐invertebrate assemblages. Rather, these were most closely related to the (probably natural) variability in sediment particle size and sorting. Analysis of the distributions of common species showed that several were responding to the discharge, but such responses were limited to within 10 m of the outfall. Trie absence of extensive impact on benthos from the outfall probably related to high water velocities (up to 0.5 m sr?1 on a mean tide) over the outfall diffuser, which would ensure that any drop in sediment oxygen levels is small. 相似文献
33.
Per Berggren Rasha Ishaq Yngve ZebÜhr Carina Nf Cecilia Bandh Dag Broman 《Marine pollution bulletin》1999,38(12):238-1084
Patterns and levels of chlorinated aromatic contaminants (DDTs, PCBs, non-ortho PCBs and PCDD/Fs) in blubber tissue were compared among six sample groups of male harbour porpoises (Phocoena phocoena) from the Baltic Sea, the Kattegat-Skagerrak Seas and the west coast of Norway. A principal component and classification analysis showed that mature harbour porpoises from the Baltic had significantly different contaminant patterns than animals from the Kattegat-Skagerrak and Norway. ANOVAs showed that mature porpoises from the Baltic had higher levels of ΣPCB and several individual PCBs and PCDD/Fs than the Kattegat-Skagerrak and the Norwegian samples and higher ΣDDT than the Norwegian. A comparison between immature porpoises showed that Baltic animals had higher levels of ΣPCDD/F than the corresponding sample from the Kattegat-Skagerrak. The levels of ΣDDT, ΣPCB and Σnon-ortho PCB were significantly higher in animals collected during 1978–81 compared to animals collected in 1988–90 indicating a temporal decline of these organochlorines in the Kattegat-Skagerrak Seas. The contaminant levels recorded in the Baltic Sea are a serious cause for concern and could have management implications for the already threatened harbour porpoises in this area. 相似文献
34.
采用延绳式、浮筏式、立桩式在外海深水区进行马氏珠母贝［Ｐｉｎｃｔａｄａ ｍ ａｒｔｅｎｓｉｉ （Ｄｕｎｋｅｒ）］人工养殖试验,结果表明：经 １１ 个月的养殖,其成活率分别为延绳式 ５６．３％ ,浮筏式 ３２．８％ ,立桩式２０．８％ ,而同期在港湾浅水区养殖时,其成活率分别为浮筏式 ２８．８％ ,立桩式 １８．５％ 。而且外海深水区养殖马氏珠母贝生长快,个体大,体质强,病害少,附着物少。此外,外海深水区延绳式养殖设施抗风浪能力强,是开发利用外海深水区的一种良好方式 相似文献
35.
Chau KW 《Marine pollution bulletin》2005,51(8-12):1078-1084
The eutrophication phenomenon often leads to undesirable water quality. This paper delineates an unsteady three-dimensional finite difference numerical model for eutrophication dynamics in the coastal waters of Tolo harbour, Hong Kong, employing the numerically generated, boundary-fitted, orthogonal curvilinear grid system as well as a grid “block” technique. It models the transport and interaction of nine water quality constituents. Adjustments of values of some kinetic coefficients in the model are effected through calibration with field data. It is demonstrated that the model can reasonably reproduce the interactions amongst all the water quality constituents, the eutrophication processes and, in particular, the featured bottom water anoxic condition during the summer in Tolo harbour. 相似文献
36.
分析苏北里下河地区排水入海的最大干河－－射阳河在本流域中的地位和作用，目前河道淤积，工程老化和水污染严重等现状，以及射阳河蕴藏着的河海联运，水源充足，自然和人文景观众多潜在优势；阐述了整治和综合开发利用射阳河的重要性和迫切性；提出了整治和开发利用的３条总体原则，大体思路及保证顺利实施的关键措施。 相似文献
37.
Zhang Shuijin 《海洋学报(英文版)》1994,13(4):589-600
ＡｎａｌｙｓｉｓｏｆｔｈｅｄｅｖｅｌｏｐｍｅｎｔａｎｄｃａｕｓｅｓｏｆｆｏｒｍａｔｉｏｎｏｆＥｕｃａｍｐｉａｚｏｏｄｉａｃｕｓｒｅｄｔｉｄｅｉｎＸｉａｍｅｎＨａｒｂｏｒ￥ＺｈａｎｇＳｈｕｉｊｉｎ（ＲｅｃｅｉｖｅｄＪｕｎｅ２０，１９９４；ａｃｃｅｐｔｅ... 相似文献
38.
39.
Abstract-The carbon and nitrogen budgets were estimated on the adult females, juveniles and post-furcilia larvae of Pseudeuphausia sinica fed on newly hatching nauplii of Artemia salina in the laborato-ry. It was found that the ingestion rate was linearly related to the food concentration, suggesting highfeeding potential. The linear correlation could be established between the respirating rate (carbon con-sumption rate) and carbon ingestion rate, as well as carbon assimilation rate. The regression coefficients(i.e.specific dynamic action coefficients) were in the range from 9% to 16% (ingested C) or 10% to17% (assimilated C) respectively, with lower in the post-furcilia larvae. There also existed a linearcorrelation equation between estimated total nitrogen excretion rate and the rates of nitrogen ingestionand assimilation separately, except for the juveniles. The defecation rates increased with the increase ofthe ingestion rate; as a result, assimilation efficiency was not related to the ingestion rat 相似文献
40.