舟山群岛和长江口邻近海域埋藏古河道水文环境特征   总被引：1，自引：1，他引：0  

刘奎  庄振业  刘东雁  叶银灿 《吉林大学学报(地球科学版)》2010,40(1):140-147

应用高分辨率地球物理方法揭示舟山群岛和长江口邻近海域埋藏大量古河道。对埋藏古河道断面特征参数进行统计分析,利用河流计算公式得到埋藏古河道相关水文环境参数值。然后应用最新河型判别方法,分析判别晚更新世末次盛冰期和冰消期研究区埋藏古河道的河流类型为辫状型;并分析得到研究区古河道的宽深比(F=22.22)、悬移质含量(M=10.10%)、河道弯曲率(P=1.52)、河曲波长(L=1 647 m)等古水文泥沙环境参数分类指标。  相似文献   

Reconstruction of incomplete satellite SST data sets based on EOF method   总被引：1，自引：0，他引：1  

DING Youzhuan  WEI Zhihui  MAO Zhihu  WANG Xiaofei  PAN Delu 《海洋学报(英文版)》2009,28(2):36-44

As for the satellite remote sensing data obtained by the visible and infrared bands inversion, the clouds coverage in the sky over the ocean often results in missing data of inversion products on a large scale, and thin clouds di?cult to be detected would cause the data of the inversion products to be abnormal. Alvera et al.(2005) proposed a method for the reconstruction of missing data based on an Empirical Orthogonal Functions (EOF) decomposition, but his method couldn’t process these images presenting ex...  相似文献   

Transfer and transport of phosphorus and silica in the turbidity maximum zone of the Changjiang estuary   总被引：1，自引：0，他引：1  

Zhiliang Shen  Shuqing Zhou  Shaofeng Pei 《Estuarine, Coastal and Shelf Science》2008

The concentration of suspended particulate matter (SPM), sedimentation flux, and various forms of phosphorus and silica in turbidity maximum zone (TMZ) in the Changjiang (Yangtze) estuary was studied. Based on the budget of P and Si, their mass balances in the TMZ were calculated. Results show that the variation in concentration of dissolved inorganic silicon (DISi) was mainly controlled by seawater dilution, while that of dissolved inorganic phosphorus (DIP) was considerably affected by the buffering of suspended matter and sediment. Our experiments showed that the sedimentation fluxes of SPM and particulate inorganic phosphorus (PIP), total particulate phosphorus (TPP), particulate inorganic silicon (PISi), and biological silicon (BSi) in the TMZ were 238.4 g m⁻² d⁻¹ and 28.3, 43.1, 79.0, 63.0 mg m⁻² d⁻¹, respectively. In addition, a simple method to estimate the ratio of resuspension of sediment in the TMZ was established, with which the rate in surface and bottom waters of the TMZ accounted for 55.7 and 66.1% of the total SPM, respectively, indicating that the sediment resuspension in the TMZ influenced significantly the mass balances of P and Si. Particulate adsorbed P (60.8%) and 35.5% of total particulate P discharged from the river were filtered and then deposited in the TMZ. The input flux of PIP from the river mouth was 55.9% of that of DIP, being important as biologically available P, while that of PISi was only 3.5% of DISi, showing that particulate adsorbed Si was much less important than particulate adsorbed P.  相似文献   

黄河清8出汊河口泥沙异重流特征及其时空分布          下载免费PDF全文

黄海军  刘艳霞  樊辉  杨晓阳 《海洋与湖沼》2008,39(1):90-96

选用1996年9月5—6日黄河口新口门水文泥沙同步观测资料,采用距离倒数加权插值法(IDW)生成河口泥沙异重流的含沙海水密度、流速和含沙量随时间变化的等值线图。基于此,分析了黄河口泥沙异重流发育形成的时空变化特征,并结合遥感影像和水下地形图进一步探讨了泥沙异重流对河口沉积的影响。研究结果表明,黄河口(新口门)泥沙异重流发育频繁,且其形成时的含沙海水密度与老河口相似;泥沙异重流的空间分布与水下三角洲泥沙堆积体及河口沙嘴的形态存在明显相关,泥沙异重流的存在直接影响河口前缘泥沙的沉积,但对侧缘的影响不大;泥沙异重流形成初期,在低高潮涨潮阶段中的一次较小的涨落潮周期内其形成和消亡过程与潮流的涨落潮周期呈正向对应关系,且在这一时段的涨憩时泥沙异重流的泥沙含量达到最大;流速垂向分布为泥沙异重流形成初期流速小于上层海水流速,且层次分明,随其进一步向深海运动流速呈增大再减小的趋势,至三角洲前缘陡坡段其底层流速大干中上层海水流速。  相似文献   

Population structure, size at maturity and condition of sardine, Sardina pilchardus (Walb., 1792), in the nursery ground of the eastern Adriatic Sea (Krka River Estuary, Croatia)     

Gorenka Sinov i&#x;  Vanja ike&#x; Ke   Barbara Zorica 《Estuarine, Coastal and Shelf Science》2008,76(4):739-744

A total of 1125 specimens of sardine, Sardina pilchardus, ranging in total length from 4.9 to 12.5 cm (mean 8.31 ± 1.41 cm) and in weights between 1.02 g and 11.18 g (mean 4.40 ± 1.87 g) were randomly sampled using a beach seine from the Krka River estuary. Samples were collected monthly according to their occurrence in this area from October to February during 2002/03, 2003/04 and 2004/05, which is during the spawning period of this species. Monthly fluctuations in the length frequency distributions of sardine were observed during that time. The length–weight relationship of all sardine specimens was described by the equation: W=0.007L^2.9587(r² = 0.9626); and the isometric nature of relative growth was established (t = −5.1495; p < 0.05). According to the allometric condition factor K_a, sardine specimens were in better somatic condition at the beginning of their appearance (spawning period) in the Krka River estuary. The length at which 50% of sardines were mature (L₅₀) was calculated to be 7.9 cm.  相似文献   

THE BIOGEOCHEMISTRY OF PHOTOSYNTHETIC PIGMENTS IN THE JIULONG RIVER ESTUARY AND WESTERN XIAMEN BAY   总被引：2，自引：0，他引：2  

徐立  洪华生  王海黎  陈伟琪 《中国海洋湖沼学报》2001,19(2):164-171

ＩＮＴＲＯＤＵＣＴＩＯＮＫｎｏｗｌｅｄｇｅｏｆｔｈｅｄｉｓｔｒｉｂｕｔｉｏｎａｎｄｃｏｍｐｏｓｉｔｉｏｎｏｆｔｈｅｃｈｌｏｒｏｐｈｙｌｌａｎｄｃａｒｏｔｅｎｏｉｄｐｉｇｍｅｎｔｓｉｎｃｏａｓｔａｌｍａｒｉｎｅｗａｔｅｒｓｐｒｏｖｉｄｅｓｉｎｆｏｒｍａｔｉｏｎｏｎｔｈｅｐｈｙｔｏｐｌａｎｋｔｏｎｂｉｏｍａｓｓａｎｄａｌｓｏｏｎｉｔｓｃｈｅｍｏｔａｘｏｎ ｏｍｙ ,ｔｈｅｃｏｎｔｒｉｂｕｔｉｏｎｏｆｒｉｖｅｒｉｎｅｉｎｐｕｔｓ,ａｎｄｔｈｅｅａｒｌｙｄｅｇｒａｄａｔｉｏｎｒｏｕｔｅｓｏｃｃｕｒｒｉｎｇｉ…  相似文献   

Sedimentary characteristics of tide-dominated estuary in Donghetang Formation (Upper Devonian), central Tarim Basin     

WANG Li-ping  LI Chuang  TANG Bing-yong Donghua University  Shanghai  China Shanghai Jiaolong University  Shanghai  China 《东北亚地学研究》2005,(Z1)

The Donghetang Formation (Upper Devonian) in central Tarim Basin has been thought an important oil and gas reservoir since the abundant oil and gas resources were found in the wells W16, W20, W34, and other fields. However, the sedimentary environment of the Donghetang Formation has been disputed because it suffered from both tidal and fluvial actions and there were not rich fossils in the sandstone. After the authors analyzed sedimentary features by means of drill cores, well logging data, paleosols, and with SEM obseruations, three kinds of sedimentary environments were distinguished: alluvial fan, tide-dominated estuary, and shelf. Particularly, the sedimentary features of tide-dominated estuary were studied in detail. Besides, the authors discussed sedimentary characteristics of the Donghetang Formation which was divided into two fourth-order sequences and five system tracts. At the same time, according to the forming process of five system tracts, the whole vertical evolution and lateral transition of tide-dominated estuary were illustrated clearly. Finally, the reservoir quality was evaluated based on porosity and permeability.  相似文献   

Modelling agricultural nitrogen contributions to the Jiulong River estuary and coastal water   总被引：5，自引：0，他引：5  

Wenzhi Cao  Huasheng Hong  Shiping Yue 《Global and Planetary Change》2005,47(2-4):111

The geographical setting of the Jiulong River estuary determines that the estuary receives wastes from both riverine input and adjacent urban sewage. However, the dominant nitrogen (N) source remains unclear. A nutrient mass-balance model and a preliminary LOICZ (Land–Ocean Interactions in the Coastal Zone) biogeochemical model were linked to evaluate agricultural N contributions from the Jiulong River catchment to the estuary and coastal water. Results showed that agricultural N surplus was the largest N source in the catchment, contributing 60.87% of the total Nitrogen (N) and 68.63% of the dissolved inorganic nitrogen (DIN). Household wastes and other sources followed. Riverine DIN fluxes were about 20.3% of exportable DIN and 14.4% of exportable total N, but approximately 9.7% of DIN inputs, and 7.3% of total N inputs to the Jiulong River catchment. The model system clearly showed that agricultural and anthropogenic activities in the catchment were the major N sources of the estuary and coastal water, and riverine N fluxes from these sources substantially impacted the estuary and coastal water quality and biogeochemical processes.  相似文献   

SEDIMENT TRANSPORT IN YALU RIVER ESTUARY   总被引：4，自引：0，他引：4  

GAOJian-hua GAOShu CHENGYan DONGLi-xian ZHANGJing 《中国地理科学(英文版)》2003,13(2):157-163

Tidal cycle measurements of tidal currents, salinity and water temperature, and suspended sediment concentra-tions were measured at four stations, together with surveys along two profdes short core collection within the Yalu River estuary.Grain size analysis of the three core sed~ment showed that: 1 ) the sediment from B1 to B3 became finer, worse sorting andpositively skewed; 2) the diversification of matter origin became more and more evident from east to west; 3) the sedimenta overthe region were of the same origin, as indicated by their similar colors and grain sizes. The data indicated that stratification occurred in the flood season, from upstream to downstream, and a salt wedge was formed. The water column was well mixed, butthe longitudinal gradient of the salinity was larger on spring tide. The resulta also showed that the dominating mechanism ofsuspended sediment transport in the Yalu River estuary was T1, T2, T3 and T5. The non-tidal steady advection transport wasrestricted by the net transport of suspended sediment induced by mass Stoked drift directed to landwards, then the net sedimenttransport rate were decreased and the turbidity maxima was also favored to forming and extending.  相似文献   

江西持续性暴雨的典型大尺度环流模型     

邹海波  单九生  吴珊珊  尹洁 《湖北气象》2013,(2):126-131

利用1961—2010年共50 a的500 hPa欧亚地区历史天气图资料对江西省74次持续性暴雨天气过程的大尺度环流形势进行分析,并建立了江西省持续性暴雨天气的大尺度环流模型。结果表明,该模型中,欧亚中高纬的长波槽脊呈双阻塞高压型,两个阻塞高压分别位于乌拉尔山西侧和鄂霍茨克海西侧;我国东北地区有一低涡,且从该低涡中心至江西附近地区有一深厚低压槽(华北槽);西太平洋副热带高压位于低纬西太平洋地区,其脊线位于20 N附近,西脊点位于110 E附近,副热带高压北侧的584 dagpm线位置(115 E的纬度)位于27 N附近;华北槽后的干冷空气与副热带高压西北侧的暖湿气流持续交汇于江西地区,为持续性暴雨提供了有利于水汽输送和辐合抬升条件。500 hPa的历史天气图和NCEP资料均显示,该大尺度环流模型具有较好的普适性。  相似文献