锦州湾泥沙运动的研究     

符文侠  刘国贤 《海洋与湖沼》1995,26(1):103-108

根据１９８５年春季和１９８６年夏季（洪水期）对锦州湾现场调查和室内分析资料计算的结果是，锦州湾沿岸河流在洪水期进入湾内泥沙量为７．４６万ｔ，全年为１３．７万ｔ，外海进入湾内的泥沙量在洪水期为８．２２万ｔ，全年为２０．１９万ｔ。故洪水期进入湾内的少量为１５．６８万ｔ，全年为３３．８９万ｔ，假如这些泥沙进入湾内作均匀沉积，则洪水季节沉积量为０．１４ｇ／ｃｍ＾２，年沉积量为０．２９８ｇ／ｃｍ＾２。  相似文献   

Vegetation of Mangroves： Spatial and Temporal Pattern of itsDominant Populations in Futian National Nature Reserve     

LiZhenji ZhengWenjiao YangZhiwei LinYiming LinPeng 《海洋通报(英文版)》2003,5(2):40-53

The community characteristics of mangroves in the Futian Nature Reserve,Shenzhen, China are given based on surveying of 33 quadrats in 4 transects which stretch from the higher tidal zone to the lower tidal zone. The results show that there are 6 community types in this area: Kandelia candel association, Avicennia marina association, A egiceras corniculatum association, Kandelia candel Aegiceras corniculatum association,degiceras corniculatum Kandelia candel association and Acanthus ilicifolius association.Kandelia candel, degiceras corniculatum and dvicennia marina dominate the typicalquadrats. Kandelia candel can be seen at almost all quadrats, Aegiceras corniculatumdistributes mostly toward the estuary and the higher tidal zone, Avicennia marina distributesmostly toward the bay and the lower tidal zone, Bruguiera gymnorrhiza occasionally occurs toward the Estuary with one or several individuals, Acanthus ilicifolius was common towardthe higher tidal zone, as an accompanying species, Derris trifoliata was common in manymature ouadrats. Totallv. 6 snecies of man~rove plants and 3 soecies of semi-mangrove plants appear in this research area. From the higher tidal zone to the lower tidal zone, the average diameter and basal area of mangrove trees increase gradually. According to the results, the dvicennia marina dominates in average diameter and basal area, and the degicerascorniculatum trees are on the contrary. From the transect ! to the transect 4, the importance value ot dvicennia marina, Bruguiera gymnorrhiza and Kandelia candel decreases, and degiceras corniculatum increases. In this area, the Kandelia candel population and Ae giceras corniculatum population are developing populations with many seedlings and saplings, but the Avicennia marina population is in a mature stage with few seedlings and not so many total individuals. According to this research, we suppose that Aegiceras corniculatum should be developed toward the estuary and the dvicennia marina association should be protected.  相似文献   

海面水温与台风关系的分形分析   总被引：1，自引：0，他引：1  

付昱华 《海洋湖沼通报》1994,(3):10-17

本文用分形方法分析了西北太平洋５３个坐标点１９４９－１９７５年多年逐月平均海面水温资料，结果表明西北太平洋逐月平均海面水温呈分形分布，而且其分维数Ｄ与台风总数有关，即Ｄ值高的月份台风总数也多。  相似文献   

Structure of a pair of anticyclonic vortices in northern part of the South China Sea in autumn of 1994     

Fu Gang  Toshio Yamagata 《海洋学报(英文版)》2002,21(2):203-216

A pair of remarkable meso-scale anticyclonic vortices, one formed closely to another, inthe northern part of the South China Sea during the period from the later August to early September of 1994 were documented by the in situ observation data. Their spatial structures were examined in detail from the horizontal and two nearly perpendicular/vertical angles of view. It was shown that the horizontal scales of these two vortices were around 100, 50 km, and their vertical scales were about 500, 1000 m, respectively. Two "warm core" structures associated with these two vortices were found in their horizontal and vertical analyses. The closer spacing of these two vortices (namely, 60 km), which was smaller than the Rossby radius of deformation, suggested that they might merge with each other during their next evolution stages and form into a larger vortex eventually.  相似文献   

Probability distribution of surface slope for nonlinear random sea waves and calculation of whitecap coverage     

Song Jinbao  Wu Kejian  Xu Delun  Sun Fu 《海洋学报(英文版)》1997,16(2):141-148

Based on the nonlinear model of two-dimensional random sea waves, a statistical distribution of wave surface slope exact to the third order is derived by using the expansion of the characteristic function and direct calculations of each order moment. Based on the distribution of wave surface slope derived in this paper, a whitecap coverage is proposed by using the limit surface slope as a criterion of wave breaking. The whitecap coverage expressed by the model depends on three parameters which can be determined in principle by the linear wave spectrum and three kinds of wave-wave interaction.  相似文献   

热带东风中经向扰动与纬向扰动的非线性相互作用   总被引：1，自引：0，他引：1  

傅刚  左中道 《中国海洋大学学报(自然科学版)》1989,(4)

根据非线性的动量方程,利用多时间尺度分析方法,探讨由经向扰动与纬向扰动相互作用在热带东风中所造成的一类正压不稳定。分析表明:在零级近似下,给出了两个扰动传播的频率表达式,在一级近似下,得到了两个零级扰动振幅的解析表达式。鉴于方程中散度项的存在,当不同尺度的三个波相作用而发生共振时,仅总动能守恒,而总位拟能不守恒,这一点与无辐散大气的结论不同。两种扰动动能相互转换的机制则是涡度场与散度场的相互作用。  相似文献   

Microbial dechlorination of dioxins in estuarine enrichment cultures: effects of respiratory conditions and priming compound on community structure and dechlorination patterns     

Shiang Fu Q  Barkovskii AL  Adriaens P 《Marine environmental research》2005,59(3):177-195

The effect of respiratory conditions and priming compound on dechlorination patterns of heptachlorodibenzo-p-dioxins (HpCDD) was investigated using estuarine sediment-eluted cultures in the presence and absence of 20 mM sulfate, and 0.2 microM 2-bromodibenzo-p-dioxin (2-BrDD) as a priming compound. Electron balance calculations based on fatty acid turnover, hydrogen production, and electron acceptor depletion/methane formation indicated that whereas fermentative processes dominated in sulfate-free incubations, sulfate-reduction was predominant in the sulfate-amended incubations. The dechlorination of 1,2,3,4,6,7,8-HpCDD exhibited the following trends: (i) the relative yields of product formation did not exceed 30% and the presence of 2-BrDD increased the yield by up to 10%; (ii) sulfidogenic conditions resulted in a lower 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD) formation, and the presence of 2-BrDD decreased the formation of 2,3,7,8-TCDD by additional 4-5-fold; (iii) the presence of 2-BrDD effected a predominance in lateral (2,3,7,8 positions) over peri (1,4,6,9 positions)-dechlorination. Denaturing gradient gel electrophoresis (DGGE) banding patterns indicated significant shifts of microbial community structure in response to terminal electron accepting processes as well as to the presence of the priming compound. The latter resulted in a similar community structure independent of dioxin spike, indicating that subsets of populations in the sediment are capable of exploiting the new niche provided by the priming compound.  相似文献   

锦州湾沉积物特征与物质来源的探讨     

符文侠  鲍永恩  何宝林 《海洋科学进展》1994,(2)

本文依据现场调查的粒度、重矿物和粘土矿物进行分析并结合河、海悬沙分析资料，阐述了锦州湾沉积物类型和特征；重矿物和粘土矿物的分布以及组合特征，并着重分析和讨论了锦州湾的物质来源。  相似文献   

钱塘江河口段通航能力的初步分析   总被引：1，自引：0，他引：1  

符宁平  余祈文 《海洋学研究》1993,11(3):10-16

本文阐述了钱塘江通海航道的现状,指出仓前至尖山的中段航道影响着河口出海通航能力,四工段浅滩是主要的碍航浅滩。文中还对不同水文条件下,钱塘江河口段的乘潮保证率和最大可能出海运量作了分析,在此基础上提出了改善航道条件的措施。  相似文献   

Bispectrum and asymmetry of wave shape     

Ding Pingxing  Kong Yazhen  Sun Fu 《海洋学报(英文版)》1996,15(3):297-305

Ｂｉｓｐｅｃｔｒｕｍａｎｄａｓｙｍｍｅｔｒｙｏｆｗａｖｅｓｈａｐｅ￥ＤｉｎｇＰｉｎｇｘｉｎｇ；ＫｏｎｇＹａｚｈｅｎ；ａｎｄＳｕｎＦｕ（ＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙＯｆＥｓｔｕａｒｉｎｅａｎｄ￣ａｌＲ￣ｈ，ＩｎｓｔｉｔｕｔｅｏｆＥＳｔｕａｒｉｎ...  相似文献