Environmental variabilities and the distribution of octocorals and black corals in Hong Kong     

C.W. Yeung  C.C. Cheang  M.W. Lee  H.L. Fung  W.K. Chow  P. Ang Jr. 《Marine pollution bulletin》2014

A recent comprehensive survey covering 125 sites in Hong Kong waters recorded 29 soft coral species in 14 genera, 38 species of gorgonians in 19 genera and six species of black corals in two genera. Environmental variabilities based on water quality data collected by Hong Kong Environmental Protection Department were analyzed using multivariate statistics to find variables that are significantly correlated with coral distribution patterns. Eleven water quality zones with similar environmental variabilities were recognized, which could further be classified into five groups, namely Inner Bay, Outer Bay, Eastern, Western and Southern waters. LINKTREE analysis provided an overall trend indicating the importance of salinity, sediment and nutrient loadings in affecting octocoral and black coral distribution from west to east of Hong Kong waters, and from inner to outer bays. Furthermore, water turbidity and wave exposure could also affect the coral distribution patterns from north, northeast to southern waters.  相似文献   

贵州省2009年冬季大气气溶胶光学厚度的特征分析     

龙俐  田鹏举  郑小波 《贵州气象》2010,34(4):3-6

利用FY-3A陆上气溶胶日产品,结合ENVI遥感影像软件和ArcGIS地理信息软件的相关模块,处理和分析了贵州省2009年冬季大气气溶胶光学厚度,并由此计算出Angstrom浑浊度系数和波长指数。分析表明:贵州省2009年冬季整层大气气溶胶光学厚度在0.55μm波段内的旬变化幅度为0.28~0.53μm,并呈现出波动性的发展趋势,特别是2010年1月下旬—2月下旬有显著增加,较大值在整个冬季都相对集中于贵州省的中部、西南部以及北部地区;在污染物浓度变化中,细粒子浓度变化因素占主导地位;与冬季的前期相比,后期气溶胶光学厚度较大,细粒子比重有所增加,浑浊度稍微偏高,造成空气轻微污染。  相似文献   

SEDIMENT RESUSPENSION IN THE CHANGJIANG ESTUARY     

SHI Weirong  LI Jiufa 《国际泥沙研究》1995,(1)

ＳＥＤＩＭＥＮＴＲＥＳＵＳＰＥＮＳＩＯＮＩＮＴＨＥＣＨＡＮＧＪＩＡＮＧＥＳＴＵＡＲＹＳＨＩＷｅｉｒｏｎｇ１ａｎｄＬＩＪｉｕｆａ２Ａｂｓｔｒａｃｔ：Ａｓｐｅｃｉｆｉｃｖａｒｉａｔｉｏｎｐａｔｔｅｒｎｏｆｔｈｅｎｅａｒｂｏｔｔｏｍｓｕｓｐｅｎｄｅｄｓｅｄ...  相似文献   

Turbidity measurements at coastal and inland sites in India     

V. V. Shirvaikar  V. Sitaraman  V. J. Daoo  V. Abrol  P. L. K. Sastry 《Pure and Applied Geophysics》1980,119(1):24-30

Analysis of turbidity measurements using a Volz sunphotometer, at three sites in India, two of them coastal and one inland, is reported. The sites are rural, far from industrial activity. After making an error analysis of the measurement technique the seasonal variations in turbidity parameters are interpreted in relation to the concurrent changes in relevant meteorological parameters like wind speed, wind direction, temperature and humidity. At coastal sites, the turbidity and the atmospheric salt concentration are found to be well correlated though the correlation coefficient varies between sites.  相似文献   

Different Behavior of Iron(III) and Aluminum(III) Salts To Coagulate Silica Particle Suspension     

Panyue Zhang  Hermann H. Hahn  Erhard Hoffmann 《洁净——土壤、空气、水》2003,31(2):145-151

The different coagulation‐flocculation behavior of iron(III) and aluminum(III) to coagulate silica particle suspension with four coagulants — FeCl₃, Fe₂(SO₄)₃, AlCl₃, and in our laboratory produced polyaluminum chloride PACl‐2.0 — was investigated through studying particle property changes and coagulation efficiency, for example, variations in zeta potential of particles, particle number, average particle diameter, particle size distribution, and residual turbidity of the supernatant water. Influences of flocculation intensity and pH value on the coagulation‐flocculation process were also studied. The results suggest that, under the test conditions, among these four coagulants FeCl₃ possesses an obviously stronger ability to form larger flocs and to remove turbidity, on the other hand, PACl‐2.0 obviously showed a better charge neutralization ability.  相似文献   

苏红图—银根盆地白垩纪沉积相与构造环境   总被引：9，自引：0，他引：9       下载免费PDF全文

李文厚  周立发 《地质科学》1997,32(3):387-396

对苏红图-银根盆地广泛发育白垩系陆相沉积的沉积相和构造环境的分析表明,盆地经历了从早白垩世退积型湖进层序到晚白垩世进积型湖退层序的沉积过程,其间发生过一次重要的地壳破裂事件,间隙式的火山喷发形成了大量火山岩。各种迹象表明,苏红图-银根盆地是典型的中新生代裂谷盆地。在此地质背景上,本区发育了一套良好的生储盖组合。  相似文献   

河口最大浑浊带数学模拟研究的进展   总被引：1，自引：0，他引：1  

沈焕庭  肖成猷 《地球科学进展》1994,9(5):20-25

分三个方面介绍了河口最大浑浊带研究中数学模拟研究的进展：（１）利用通量分析计算河口盐度、污染物和泥沙通量，分析带内泥沙富采机制；（２）由物质平衡原理建立一维和较简单的机理模型，讨论最大浑浊带的成因；（３）据水动力方程和物质平衡方程建立二维或三维数值模型，计算最大浑浊带的水流结构和物质浓度分布，模拟并探讨不同条件下最大浑浊带的成因和演化机制。  相似文献   

The output of sediments and solutes from forested and cultivated clayey drainage basins in Luxembourg     

A. C. Imeson  M. Vis 《地球表面变化过程与地形》1984,9(6):585-594

The output of material from 11 small drainage basins in the Keuper region of central Luxembourg is considered. Attention is given to differences between forested and cultivated basins. Whilst the output of suspended solids from the cultivated Mosergriecht catchment may be as much as five times higher than from the forested Keiwelsbaach, the solute load is only 50 per cent and the runoff 20 per cent higher. Relationships between dispersed clay in suspension and the water chemistry observed for the forested drainage basins are not present in the cultivated catchments. Water having a milky appearance and containing dispersed clay is of more frequent occurrence in forested basins where subsurface runoff occurs in macropores and cracks in the undisturbed soil.  相似文献   

Morphology, hydrography and sediment dynamics in a mangrove estuary: The Konkoure Estuary, Guinea   总被引：1，自引：0，他引：1  

S. Capo  A. Sottolichio  I. Brenon  P. Castaing  L. Ferry 《Marine Geology》2006,230(3-4):199-215

The Konkouré Estuary in the Republic of Guinea is a poorly understood atypical mangrove system. Sediment dynamics in tropical estuaries are controlled by a combination of processes including river discharge, morphology, salinity, erosion and deposition processes, the settling of mud, physico-chemical processes and mangrove swamps. Here we present a consistent set of data aimed at characterising the estuary and thus, increasing our understanding of tropical systems, as well as studying the impact of human intervention in the region. Water elevations, current measurements, salinity, suspended sediment concentrations, bathymetry and sediment cover are presented following a 3 year survey of the Konkouré Estuary. Here we provide conclusive evidence that the Lower Konkouré is a shallow, funnel shaped, mesotidal, mangrove-fringed, tide dominated estuary, well mixed during low river discharge. The estuary becomes stratified during high river flows and spring tides whereas a salt wedge appears during neap tides. The Konkouré Estuary has been described as hypersynchronous, and has three terminal outlets, two of which are landward-directed, attesting to a tidal pumping effect, while the third one is seaward-directed, and is controlled by the mangrove. The suspended matter is transported by the tidal effect within the middle estuary and is therefore trapped in the Turbidity Maximum zone (TMZ). The location of the TMZ is river-controlled and is correlated with residual currents but not with salinity front. A dam, constructed 130 km upstream, impacts on the hydrodynamics, and reduces the salinity intrusion by about 25%. It causes an increased low river discharge whereas its efficiency over high river flows is unclear.  相似文献   

长江河口最大浑浊带的悬沙输移特征   总被引：15，自引：0，他引：15  

贺松林  孙介民 《海洋与湖沼》1996,27(1):60-66

根据１９８８年洪、枯季在和长江口南、北槽进行的最大浑浊带专项水文观测的资料，对悬沙输移的分项因子进行研究。结果表明，长江口最大浑浊带的悬沙输移过程存在明显的潮泵效应及强烈的悬沙、底沙双向交换；长江口南、北槽之间存在一个大尺度的平面环向悬沙输移，同时南、北槽自身还有次一级尺度的槽内平面环向悬沙输移。本文还探讨了最大浑浊带与拦门浅滩相互影响、彼此制约的关系。  相似文献