现代黄河水下三角洲的地貌特征及演化     

任于灿 《海洋地质与第四纪地质》1992,12(4):59-68

本文主要根据黄河水利委员会多年固定断面的测量资料和海洋地质研究所1988年两个航次调查结果,结合黄河水沙资料的分析,对水下三角洲的地貌特征、地貌演化及形成机制进行了论述,尤其对三角洲前缘的地貌演化趋势进行了较详细地阐述。  相似文献   

南大洋深海嗜冷菌2-5-10-1及其低温脂肪酶的研究   总被引：14，自引：0，他引：14  

林学政  杨秀霞  边际  黄晓航 《海洋学报》2005,27(3):154-158

从南大洋普里兹湾的水样中筛选到一株产低温脂肪酶的深海嗜冷菌2-5-10-1,对其生长及产酶情况和酶性质做了初步研究.该菌株的最适生长温度为5℃,此时分泌的胞外脂肪酶最多;添加Tween80,橄榄油可显著促进脂肪酶的产生.该脂肪酶的最适作用温度为35℃,在0～20℃均保持较高的酶活性,在0℃可保持37%的相对酶活性;酶的最适作用的pH值为7.5,在pH6～9的范围内均存在较高酶活性;对热较敏感,在60℃保温15min可丧失50%以上的酶活性.该脂肪酶的催化作用不需要金属离子的参与,Cu2+和Zn2+对酶活有着强烈的抑制作用.  相似文献   

深水网箱投饵机设计与试验研究   总被引：15，自引：0，他引：15  

宋协法  路士森 《中国海洋大学学报(自然科学版)》2006,36(3):405-409

根据网箱养殖的特点,结合网箱养殖的经验,设计了1种深水网箱投饵机,并进行了相应的试验,测定了不同情况下产生的真空度以及在冲饵管和吸饵管不同开度时的下料时间。此投饵机使用水力环流供饵、水力抽负吸饵、水动力投饵,充分利用了丰富的海水资源,用汽油机水泵作动力,利用管道将饵料抛向网箱,可向多个、距离不同的网箱供饵。作为1种新的投饵机具,可用于网箱养鱼和池塘养鱼的投饵。  相似文献   

Benthic Metabolism and Standing Stock in the Central and Northern Deep Red Sea     

H. Thiel    O. Pfannkuche    R. Theeg  G. Schriever 《Marine Ecology》1987,8(1):1-20

Abstract. Benthic metabolism and standing stocks were investigated in the deep Red Sea between 21^o and 27^oN, Activity was assessed by the determination of respiration rates with a shipboard method and by calculating oxygen consumption from the activity in the electron transport system. We attempted to compare results from different latitudes within the warm Red Sea and with data from cold Atlantic environments. Our investigations were part of an environmental risk assessment to evaluate future mining of metalliferous sediments from the Atlantis II Deep.  相似文献   

烟台市污水处理深海排放工程设计方案研究与选择   总被引：2，自引：0，他引：2  

王文喜  李明基 《海岸工程》1997,16(1):30-35

沿海城市污水处理深海排放工程在我国起步较晚，烟台市污水处理深海排放工程我国目前规模最大的同类工程，且已进入施工阶段，本文详细阐述了该工程及水工设计方案，在我国城市污水２深海排放工程领域作了积极有益的探索。  相似文献   

Tectonic Significance of the Taitung Canyon, Huatung Basin, East of Taiwan     

Jean-Claude Sibuet  Shu-Kun Hsu  Alain Normand 《Marine Geophysical Researches》2004,25(1-2):95-107

Since the beginning of formation of Proto-Taiwan, the subducting Philippine (PH) Sea plate has moved continuously through time in the N307° direction with respect to Eurasia (EU), tearing the EU plate. The subducting EU plate includes a continental part in the north and an oceanic part in the south. The boundary B between these two domains corresponds to the eastern prolongation of the northeastern South China Sea ocean-continent transition zone. In the Huatung Basin (east of Taiwan), the Taitung Canyon is N065° oriented and is close and parallel to B. Seismic profiles show that the southern flank of the canyon corresponds to a fault with a normal component of a few tens of meters in the sediments and possible dextral shearing. Several crustal earthquakes of magnitude >%6 are located beneath the trend of the Taitung Canyon and focal mechanisms suggest that the motion is right-lateral. Thus, faulting within the sedimentary sequence beneath the Taitung Canyon is a consequence of underlying dextral strike-slip crustal motions. As the continental part of the EU slab located north of B has been recently detached, some subsequent dextral strike-slip motion might be expected within the EU slab, along the ocean-continent transition zone, which is a potential zone of weakness. We suggest that the dextral strike-slip motion along the ocean-continent boundary of the EU slab might trigger the observed dextral strike-slip motion within the overlying PH Sea crust and the associated faulting within the sediments of the Huatung Basin, beneath the Taitung Canyon. An erratum to this article is available at .  相似文献   

埕岛油田海上石油平台基础冲刷研究   总被引：6，自引：1，他引：6  

仲德林  刘建立 《海岸工程》2003,22(2):37-43

海洋石油平台的建立会改变平台周围的水动力条件，其中平台的基础及与之连接的海底管缆(输油管道、注水管道、海底电缆等)附近产生冲刷现象，对平台和海底管缆的安全造成威胁。根据对研究区典型平台的4次实洲水深并结合以往资料，分析了埕岛油田海上石油平台基础冲刷的过程及其规律。  相似文献   

Experimental Study on Friction Coefficient Between Concrete and the Top Surface of Rubble Mound Foundation     

李炎保  蒋学炼  郭鸿仪 《中国海洋工程》2005,19(2):287-298

Experimental studies on the friction coefficient between concrete and the top surface of a rubble mound foundation in China are reviewed. Through comparison of different test results, the development of this research is comprehensively analyzed. An experiment is carried out in the condition similar to prototype. The process curve of friction coefficient with the test block sliding is analyzed and a standard for determination of the friction coetfficient is defined. The variation features of the friction coefficient are analyzed on the basis of the present experimental results and other studies in China. It is shown that the friction coettfficient between concrete and the top surface of a rubble mound foundation decreases with the increase of the foundation pressure, and the friction coettqcient for a very fine leveling bed is smaller than that for a fine leveling bed.  相似文献   

桩-网路堤位移应力分析及其应用     

潘学政  吴明  陈汉良 《海洋学研究》2007,25(2):57-62

由于桩-网复合地基的结构形式比较复杂,难以采用解析法求得其应力和位移。利用有限差分法对某桩-网法路堤进行了数值模拟,并取得了较好结果。计算结果显示,桩间土沉降线为悬链线,与现场位移监测结果吻合较好;桩身弯矩和桩土应力反映了桩-网复合地基的一些受力机理。分析认为,桩间土沉降较大的主要原因是由土体本身压缩及桩侧弯引起的。  相似文献   

Experimental Study on Stability of Breakwaters with Penetrating Box Foundations     

别社安  李伟  李增志  任增金  及春宁 《中国海洋工程》2003,17(1)

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