地面沉降对渤海湾风暴潮灾害防治的影响研究     

王威  周俊  易长荣 《城市地质》2011,6(4):31-35

渤海湾沿海地区地面沉降严重、风暴潮灾害频发。本文以天津作为典型区域,对风暴潮潮位测定、风暴潮灾害和防风暴潮预案措施等方面开展研究,认为地面沉降对上述3方面均有的不同程度的影响,在风暴潮灾害防治中必须考虑地面沉降问题。  相似文献   

渤海湾全新世贝壳堤与牡蛎礁:古气候与海面变化   总被引：6，自引：3，他引：3  

王宏  陈永胜  田立柱  李建芬  裴艳东  王福  商志文  范昌福  姜兴钰  苏盛伟  王海峰 《地质通报》2011,30(9):1405-1411

讨论了早全新世晚期以来渤海湾西岸贝壳堤平原成堤、西北岸牡蛎礁平原(及毗邻浅海区)建礁过程的同时性特征和气候变化与这一特征之间的关系,以及堤、礁记录的相对海面变化。堤、礁大致同时发育,可分为6期,依次分别被寒冷事件5、4、3、2和1分隔。堤底板前、后缘高差大致对应3m的大潮差、礁顶板大致对应海平面。据二者分别重建了南部贝壳堤平原、北部牡蛎礁平原的相对海面变化:南部自7ka cal BP以来基本与现代海平面等高,小的波动在±1m之间,压实固结作用抵消了中全新世的相对高海面;北部中全新世的相对海平面位置因新构造和固结压实双重下沉作用的影响,已位于现代海平面2~3m以下。  相似文献   

胶州湾营养盐浓度与结构的长期变化   总被引：15，自引：0，他引：15  

孙晓霞  孙松  赵增霞  沈志良 《海洋与湖沼》2011,42(5):662-669

依据自20世纪60年代以来胶州湾营养盐调查与研究资料,系统分析了近40余年来胶州湾营养盐浓度与结构的长期变化规律,以及2000年以后胶州湾营养盐浓度与结构的变化特征。结果表明,近几十年来胶州湾各项营养盐浓度都呈现增加趋势,但不同种类营养盐浓度变化的时期并不相同。氨氮浓度到2001年达到顶峰,随后呈现下降趋势。而亚硝酸盐...  相似文献   

基于3S的荣成湾沿岸土地覆被变化及驱动力研究          下载免费PDF全文

张明明  王庆  李希国  刘亚龙  衣华鹏  邸向红  孙云华  田清 《海洋与湖沼》2011,42(1):20-26

运用3S技术对最近40年来荣成湾沿岸土地覆被动态变化及驱动力进行研究.结果表明,该区海岸湿地土地覆被总面积和陆域土地覆被总面积变化不大,但其各自类型结构和分布均发生了显著调整,而且二者变化在时间上不同步.从面积上讲,前者以1981年为界,渴湖和沙地先减少后波动增加,滩涂和沼泽地先增加后波动减少;养殖池从无到有并迅速增加...  相似文献   

Anthropogenic influences on shoreline and nearshore evolution in the San Francisco Bay coastal system   总被引：1，自引：0，他引：1  

Kate L. Dallas  Patrick L. Barnard 《Estuarine, Coastal and Shelf Science》2011

Analysis of four historical bathymetric surveys over a 132-year period has revealed significant changes to the morphology of the San Francisco Bar, an ebb-tidal delta at the mouth of San Francisco Bay estuary. From 1873 to 2005 the San Francisco Bar vertically-eroded an average of 80 cm over a 125 km² area, which equates to a total volume loss of 100 ± 52 million m³ of fine- to coarse-grained sand. Comparison of the surveys indicates the entire ebb-tidal delta contracted radially, with the crest moving landward an average of 1 km. Long-term erosion of the ebb-tidal delta is hypothesized to be due to a reduction in the tidal prism of San Francisco Bay and a decrease in coastal sediment supply, both as a result of anthropogenic activities. Prior research indicates that the tidal prism of the estuary was reduced by 9% from filling, diking, and sedimentation. Compilation of historical records dating back to 1900 reveals that a minimum of 200 million m³ of sediment has been permanently removed from the San Francisco Bay coastal system through dredging, aggregate mining, and borrow pit mining. Of this total, ∼54 million m³ of sand-sized or coarser sediment was removed from central San Francisco Bay. With grain sizes comparable to the ebb-tidal delta, and its direct connection to the bay mouth, removal of sediments from central San Francisco Bay may limit the sand supply to the delta and open coast beaches.  相似文献   

Distribution of suspended particulate matter in the northern Bohai Bay in summer and its relation with thermocline     

L.L. Qiao  Y.Z. Wang  G.X. Li  S.G. Deng  Y. Liu  L. Mu 《Estuarine, Coastal and Shelf Science》2011

Field observations of suspended particulate matter (SPM) in the Bohai Bay, China have not been widely reported. The aim of this paper is to describe the horizontal and vertical distribution of mass and volume concentrations of SPM, respectively, based on observed data at 312 stations in the northern Bohai Bay during summer of 2006. A numerical model ECOMSED coupled with a sediment transport module was also established to further discuss the mechanism of the thermocline effect on the vertical distribution of SPM. The mass concentrations of SPM exhibited high inshore values and low offshore values in the horizontal distribution; while in the vertical direction, characteristics of the volume concentration of SPM can be divided into two types: one with a sharp peak at depth of 10–15 m and another without. The peak value at the depth of the thermocline was resulted from concentrated phytoplankton. A numerical experiment further displayed that the thermocline can also prevent particles from being resuspended upward.  相似文献   

Short-term residence and movement patterns of the annular seabream Diplodus annularis in a temperate marine reserve     

David March  Josep Als  Amlia Grau  Miquel Palmer 《Estuarine, Coastal and Shelf Science》2011,92(4):251-587

The short-term movements of a small temperate fish, the annular seabream Diplodus annularis (Linnaeus 1758), were examined using standard tag-recapture and passive acoustic telemetry in Palma Bay (NW Mediterranean), a marine protected area (MPA). The study aimed to provide valuable information for assessing the recreational fishery and its results suggest that MPAs can be used to protect the adult stock of D. annularis. All the fish tagged with standard tags were recaptured near the release locations, with a maximum distance of ∼300 m. The maximum time between release and recapture was 185 d. Two different arrays of acoustic receivers were deployed, one in 2008 and another in 2009, within the MPA. Twenty adults were surgically tagged with acoustic transmitters. Fish monitored in 2008 (n = 12) were translocated from the point of capture to analyse the movement behaviour after artificial displacement. Upon release at displaced locations, 67% of the fish moved towards the original capture location using a time of return that ranged from 0.75 to 15.25 h. Fish monitored in 2009 (n = 8) were released at the point of capture. They showed high site fidelity with a maximum period of 27 d between the first time and the last time they were detected.  相似文献   

Ecological periodic tables for benthic macrofaunal usage of estuarine habitats in the US Pacific Northwest     

Steven P. Ferraro  Faith A. Cole 《Estuarine, Coastal and Shelf Science》2011,94(1):36-47

This study shows that spatially and temporally recurring benthic macrofauna-habitat patterns validate the ecological relevance of habitat types to benthic macrofauna and suggest they can serve as elements in ecological periodic tables of benthic macrofaunal usage. We discovered patterns across nine habitat types (intertidal eelgrass [Zostera marina], dwarf eelgrass [Zostera japonica], oyster [Crassostrea gigas] ground culture, burrowing mud shrimp [Upogebia pugettensis], burrowing ghost shrimp [Neotrypaea californiensis], shell, sand, mud, and subtidal) on a variety of benthic macrofaunal community state variables in Grays Harbor, Washington, USA and compared them to those in Willapa Bay, Washington, USA. There were nominal differences in benthic macrofaunal Bray-Curtis similarity between all the habitats investigated except eelgrass and oyster in both estuaries. Across-habitat patterns on mean benthic macrofaunal species richness, abundance, biomass, abundance of deposit, suspension and facultative feeders, a dominance and a diversity index for the five habitats common to both studies were the same on a rank measurement scale: eelgrass ≈ oyster > mud shrimp > ghost shrimp ≈ subtidal. The patterns for most of the habitats and benthic macrofaunal measures were the same on a ratio measurement scale.  相似文献   

莱州湾东部沙波地貌分布特征及其形成演化   总被引：1，自引：0，他引：1  

李近元  范奉鑫  徐涛  栾振东  张捷扬 《海洋科学》2011,35(7):51-54

由2009年海底地形地貌调查资料,对莱州湾东部海底沙波的分布和形成进行探讨研究。结果发现：该地区发育大面积海底沙波地形,沙波主要为二维直线型沙波,陡峭度为0．001,对称指数为1．2,对称指数较好。沙波的形成和海底坡度以及水深有密切关系,在平坦海底易于形成,且与水深有一定的负相关关系。莱州湾东部沙波是10m等深线的古海...  相似文献   

南极普里兹湾溶解态镉的分布     

孙维萍  扈传昱  韩正兵  薛斌  潘建明 《海洋通报(英文版)》2011,13(1):50-59

利用25次南极科考获得的海水样,采用原子分光光度法(AAS)测定了海水中溶解态镉的含量,研究了东南极普里兹湾不同空间与时间尺度下海水中溶解态镉的分布特征.并利用同航次相关的营养盐、叶绿素a等数据,分析了影响海水中溶解态镉分布的主要因素.研究结果显示,普里兹湾表层海水中溶解态镉的分布与叶绿素a具有良好的相关性,生物过程是...  相似文献