紫彩血蛤的生物扰动对沉积物颗粒垂直分布的影响   总被引：3，自引：3，他引：0  

于子山  王诗红  张志南  周宇 《中国海洋大学学报(自然科学版)》1999,(2)

以玻璃珠作为示踪颗粒,研究底栖双壳类软体动物紫彩血蛤对沉积物的扰动。室内实验的结果表明,在整个实验周期１０ｄ内,沉积物表层的示踪颗粒有４７％向下迁移,最大迁移深度１２ｃｍ,垂直迁移率为１．８０×１０－５·ｇ－１·ｃｍ－２·ｄ－１。沉积物１０ｃｍ深处的示踪颗粒分别有４５％和１５％向上和向下迁移,向上及向下迁移率分别为１．８９×１０－５·ｇ－１·ｃｍ－２·ｄ－１和０．６３×１０－５·ｇ－１·ｃｍ－２·ｄ－１  相似文献   

太阳黑子对东海气旋及热带气旋活动的影响     

陈文玉  何翔 《海洋预报》1999,16(1):35-40

本文利用１９４９～１９９７年的资料,以统计分析的方法,对太阳黑子及东海气旋①,热带气旋②活动的互相关系,进行了初步探讨,归纳出几点有参考价值的结论  相似文献   

冲击回转在复杂条件下钻进若干问题分析及处理措施   总被引：2，自引：0，他引：2  

熊青山  赵文玉 《地质与勘探》1999,35(4):56-58

气动冲击回转钻进主要应用于难用或忌用液体作为循环介质的地区。而“引松入长”工程中的爆破孔施工是在水量极丰富、气温极低、地层极复杂条件下进行,本文对其出现的问题进行了分析,并提出了合理的解决措施  相似文献   

广东华侨文化景观及其地域分异   总被引：6，自引：0，他引：6  

许桂灵  司徒尚纪 《地理研究》2004,23(3):411-421

华侨文化地理研究 ,在国内外是一个薄弱领域。本文以我国华侨人数最多、分布最广的广东为对象 ,阐述华侨文化的内涵 ,侨乡在引种外来作物形成的土地利用景观 ;引进西方骑楼和城镇规划制度 ,并结合当地环境产生的建筑文化景观 ;外语与方言相结合并广泛办侨刊形成的语言文字景观 ,以及华侨形成的人才文化景观等特色和影响。根据侨乡文化特质的相对一致性和侨居地文化背景相对共同性相结合的原则 ,首次划分珠江三角洲广府、五邑、潮汕、东江 -兴梅、琼东北 5个华侨文化区 ,并指出它们各自的文化特点和区域效应等  相似文献   

太湖流域浙西区不同农业土地类型的面源污染产出     

李恒鹏  刘晓玫  黄文钰 《地理学报(英文版)》2004,14(2):151-158

This paper takes Zhexi hydraulic region in Taihu Basin as a study area. On the basis of hydraulic analysis function of Arcgis8.3, the drainages were delineated by selecting the monitoring points and discharge stations as outlets. The landuse map were finished by denoting the TM/ETM image. The precipitation map was finished by spatial interpolation according to the rainfall monitoring records. Overlaying the drainage boundary, landuse map and precipitation map, the rainfall, different landuse type area, and runoff pollution concentration and runoff were calculated. Based on these data in different sub-watersheds, by Origin7.0 regression tool, an equation is established to predict runoff using the relationships between runoff, precipitation depth and land use patterns in each of the sub-watersheds. Selecting the sub-watershed which is mainly composed of forest landuse type, the mean runoff concentration (MRC) from sub-watershed has been estimated. The mean runoff concentration of farmland has been estimated by the same methods after the contribution of forestlanduse type was removed. The results are“ for the forest landuse type, the mean runoff concentrationsof COD, BOD, Total N and Total P are 2.95 mg/l, 1.080 mg/l, 0.715 mg/l, and 0.039 mg/l,respectively; for the farmland, the mean runoff concentrations of COD, BOD, Total N and Total P are 5.721 rag/l, 3.097 rag/l, 2.092 rag/l, and 0.166 rag/l, respectively. By using these results, the agriculture non-point pollution loads have been assessed. The loads of COD, BOD, Total N and Total P in Zhexi region are 14,631.69 t/a, 6401.93 t/a, 4281.753 t/a and 287.67 t/a, respectively.  相似文献   

台湾海峡晚更新世以来的高分辨率地震地层学研究   总被引：1，自引：1，他引：1  

周勐佳  吴自银  马胜中  尚继宏  梁裕杨  周洁琼  李守军  赵荻能 《海洋学报》2016,38(9):76-88

基于4 530 km高分辨率单道地震数据和钻孔资料,采用高分辨率地震地层学的方法,对台湾海峡晚更新世以来的地层进行了划分,自上而下共识别出R₀、R₁、R₂、R₃、R₄等5个主要反射界面,分别对应海底、3 ka BP前后高海平面、最大海泛面、海侵面和 Ⅰ 型层序界面,并以此划分出4个地层单元:晚全新世浅海-滨海沉积A,中全新世浅海沉积B,早全新世海侵沉积C,晚更新世陆相河流沉积D。在海平面变化的作用下,海峡地区先后发育低水位沉积D（低位体系域）,海侵沉积C （海侵体系域）、高水位沉积B和A（高位体系域）。研究了台湾海峡的典型地震相,提出了关于台中浅滩（云彰隆起）处的楔状沉积体的新观点,认为该楔状体为全新世中期以来形成的三角洲沉积受波浪和潮流作用改造而形成的潮流沙脊,其物质主要来源于台湾。识别出了晚更新世和早全新世古河道沉积,海平面变化和地势高低是其形成时间差异的主要因素。  相似文献   

Comparison of buried sand ridges and regressive sand ridges on the outer shelf of the East China Sea   总被引：4，自引：0，他引：4  

Ziyin Wu  Xianglong Jin  Jieqiong Zhou  Dineng Zhao  Jihong Shang  Shoujun Li  Zhenyi Cao  Yuyang Liang 《Marine Geophysical Researches》2017,38(1-2):187-198

Based on multi-beam echo soundings and high-resolution single-channel seismic profiles, linear sand ridges in U14 and U2 on the East China Sea (ECS) shelf are identified and compared in detail. Linear sand ridges in U14 are buried sand ridges, which are 90 m below the seafloor. It is presumed that these buried sand ridges belong to the transgressive systems tract (TST) formed 320–200 ka ago and that their top interface is the maximal flooding surface (MFS). Linear sand ridges in U2 are regressive sand ridges. It is presumed that these buried sand ridges belong to the TST of the last glacial maximum (LGM) and that their top interface is the MFS of the LGM. Four sub-stage sand ridges of U2 are discerned from the high-resolution single-channel seismic profile and four strikes of regressive sand ridges are distinguished from the submarine topographic map based on the multi-beam echo soundings. These multi-stage and multi-strike linear sand ridges are the response of, and evidence for, the evolution of submarine topography with respect to sea-level fluctuations since the LGM. Although the difference in the age of formation between U14 and U2 is 200 ka and their sequences are 90 m apart, the general strikes of the sand ridges are similar. This indicates that the basic configuration of tidal waves on the ECS shelf has been stable for the last 200 ka. A basic evolutionary model of the strata of the ECS shelf is proposed, in which sea-level change is the controlling factor. During the sea-level change of about 100 ka, five to six strata are developed and the sand ridges develop in the TST. A similar story of the evolution of paleo-topography on the ECS shelf has been repeated during the last 300 ka.  相似文献   

直接滴定法测定鱼油中酸价的研究   总被引：1，自引：0，他引：1  

翟毓秀  尚德荣 《海洋科学》1997,21(5):65-66

  相似文献   

POM模式边界条件的数值试验及其在环台湾岛海域风生流模拟中的应用   总被引：3，自引：0，他引：3  

吕新刚  沙文钰 《海洋通报》2003,22(1):17-23

通过一个数值试验，对运用POM模式做风生流模拟时边界条件的选取方案做了初步的讨论。试验表明，POM“外模式”采用辐射边条件、“内模式”采用辐射方案的改进形式是一种可行的方法：如果用水位作为控制条件，也可以使用辐射边条件。文章同时给出了环台湾岛海域冬、夏风季生流的模拟结果。  相似文献   

污水排放影响下平潭近岸海水COD和DIN浓度场的数值模拟     

姜尚  张平  欧阳玉蓉  侯建平 《台湾海峡》2014,(1):118-124

利用Delft3D数学模型建立了平潭综合实验区近岸海域物质输运数学模型,模拟了澳前、海坛海峡北、海坛海峡南、流水、竹屿5个排污口在不同污水排放量下COD、无机氮浓度的分布．结果表明：在污水排放规模为3．0×10^4t／d时,竹屿排污口邻近海域海水COD、无机氮质量浓度分别为3．80、0．51mg／dm3,流水排污口邻近海域海水COD、无机氮质量浓度分别为3．60、0．42mg／dm3,都超过二类海水水质标准值,表明这2个海域水动力条件较弱、污染物扩散缓慢,不是理想的排污口．在污水排放量为1．5×10^5t／d时,海坛海峡北排污口邻近海域海水COD、无机氮质量浓度分别为1．87、0．28mg／dm3,海坛海峡南排污口邻近海域海水COD、无机氮质量浓度分别为1．84、0．27mg／dm3;澳前排污口在污水排放量为5．0×10^5t／d时,其邻近海域海水COD、无机氮质量浓度分别为2．48、0．28mg／dm3,均符合二类海水水质要求,表明上述海域水动力条件良好、纳污能力强、环境容量大,是较好的污水排放口．该研究可为平潭综合实验区海域污水排放口选址优化提供科学依据,为该海域入海污染物总量控制和海洋环境管理提供参考．  相似文献