中国东部中生代以来之地壳运动及火山活动   总被引：9，自引：1，他引：8  

翁文灏 《地质学报》1927,6(1):1-7

此篇分中国东部地壳运动为四大期,(一)秦领期在古生代之末在东部不甚显著·(二)燕山期在东部范围较广南北皆有,其时代在侏罗纪终,白垩纪前,其连带现象为花岗闪长岩之侵入及接触铁矿及铜矿之生成,造山运动终後则有斑状火山岩流之喷出.(三)南领期南方花岗岩及金属矿带之生成约在第三纪初或至早白垩纪终.(四)陇山期第三纪後半期之摺曲惟甘东及川东较著。  相似文献   

PROCEEDINGS OF THE EIGHTH GENERAL MEETING HELD IN PEKING,JULY 25th. & 26th.,1924.     

W.H.WONG 《地质学报》1924,(Z1)

The eighth general meeting of the Geological Society of China was the first meeting in the year 1924, following the Annual Meeting. It was arranged in two evenings as follows.  相似文献   

THE EFFECT OF MINE TAILINGS ON LEVELS OF HEAVY METALS IN SEAWATER     

C. S. WONG  F. A. WHITNEY  W. K. JOHNSON  LU XIANKUN  WU JINPING  WU SHENGSAN  LI JINXIA 《海洋学报(英文版)》1986,5(3):401-415

Changes in levels of heavy metals in seawater resulting from the addition of mine tailings were studied using plastic enclosures. Nominal concentrations of 10 mg l-1 and 100 mg l-1 of mine tailings from a B. C. molybdenum mine were added, and the metal levels were followed together with sedimentation rates, particle size distribution and other oceanographic and biological time-series parameters over sixteen days. No substantial elevation in levels of zinc, cadmium and copper was observed in the tailing bags compared to that in a background control bag with no addition of tailings. Lead showed a substantial increase in seawater following tailing addition and its removal apparently was with detritus settling following a plankton bloom, and inorganic settling of fine tailing particles.  相似文献   

A model study of influence of circulation on the pollutant transport in the Zhujiang River Estuary and adjacent coastal waters     

WONG Lai Ah  GUAN Weibing  CHEN Jay-Chung  SU Jilan 《海洋学报(英文版)》2004,23(3)

A tracer model with random diffusion coupled to the hydrodynamic model for the Zhujiang River Estuary (Pearl River Estuary, PRE) is to examine the effect of circulations on the transport of completely conservative pollutants. It is focused on answering the following questions: (1) What role does the estuarine plume front in the winter play in affecting the pollutants transport and its distribution in the PRE ? (2) What effect do the coastal currents driven by the monsoon have on the pollutants transport? The tracer experiment results show that: (1) the pollutant transport paths strongly depend on the circulation structures and plume frontal dynamics of the PRE and coastal waters; (2) during the summer when a southwesterly monsoon prevails, the pollutants from the four easterly river inlets and those from the bottom layer of offshore stations will greatly influence the water quality in Hong Kong waters, however, the pollutants released from the four westerly river-inlets will seldom affect the water quality of Hong Kong waters due to their transport away from Hong Kong; (3) during the winter when a northeasterly monsoon prevails, all pollutants released from the eight river gates will be laterally transported seaward inside the estuary and transport westward in the coastal waters along the river plume frontal zone. However, pollutants released from the surface layer of offshore stations near or east of the Dangan Channel will be carried into the coastal waters of Hong Kong by the landward component of the westward coastal current driven by the winter northeasterly monsoon. But the pollutants from the bottom layer of the offshore stations will be carried away from the offshore by the bottom flow driven by the northeasterly monsoon. This implies that only surface-released matter from offshore stations will affect the water quality of the coastal waters around Hong Kong during the winter when a northeasterly monsoon prevails.  相似文献   

MEASUREMENT OF PRIMARY PRODUCTION IN AN ENCLOSED WATER COLUMN     

吴晋平  F. A. WHITNEY  C. S. WONG 《海洋学报(英文版)》1986,5(4):584-592

A CEE (2.5 m by 16 m) has been used to study the budget of organic production by measuring the changes in POC/N, oxygen and 14CO, uptake through three-week period. 14C primary production measurements were conducted with 4-hours and 24-hours incubation periods, and with size fractionation. Different types and sizes of bottle effects were examined. Results showed that the oxygen method production was highest, followed by the 14CO2 uptake method, and POC gain showed the lowest. The value of PQ should be more than 1.7. The ratio of 4-hour incubation to 24-hour incubation was 2.42±0.22, indicating that net daily production is equal to 9.7±0.9 h of illuminated growth. Different types and sizes of bottles had little effect on primary production.  相似文献   

POM模式在河口湾污染物质输运过程模拟中的应用   总被引：6，自引：2，他引：6  

管卫兵  王丽娅  潘建明  董礼先 《海洋学报》2002,24(3):9-17

具有复杂地形的河口湾,由于冲淡水的影响,湾内的流动具有很强的三维结构.因此要再现河口湾各种过程,必须进行三维数值模拟.在实际应用中,选用水平上采用正交曲线性网格和垂向上采用σ坐标的POM模式作为水动力模式比较合适.本研究在POM模式的基础上添加了示踪粒子三维Lagrange运动轨迹计算及水质模块,用以研究榆林湾水交换能力和污染物质输运过程.  相似文献   

Methodology for estimation of river discharge and application of the Zhujiang River Estuary(ZRE)     

CHEN Jay-Chung  WONG Lai-Ah 《海洋学报(英文版)》2004,23(3):377-386

The ZRE is a very complicated estuary with multi-river inlets. The total sum of river discharge in the upstream(away from the tidal influence region) of the Zhujiang River can be easily measured. However, when the total river discharges into the estuary from eight inlets, it is a very difficult task to obtain a continuous river discharge flux data from each branch of the Zhujiang River. However, the different ratios of river discharges between the river branches can significantly affect the estuarine circulation feature and baroclinic process. Moreover, the accuracy of numerical forecast for the estuarine circulation is very much dependent on the accuracy of the time history of the river discharge flux for each branch. Therefore, it is important to estimate river discharge from each branch in order to improve the accuracy of the model forecast for the circulation of the ZRE. The development of a new estimation method of the river discharges is focused on based on the system identification theory, numerical modeling and the time history data from the CODAR observed sea surface current. The new approach has been appfied to estimating the time history (hourly) of river discharge from each branch in the upstream of the ZRE.  相似文献   

香港的新构造断裂活动与天然山体滑坡关系的初步研究     

李进华  邓丽君  王俊晖  丁原章 《华南地震》2008,28(2):108-117

香港沙田河沥背地区西北向断裂的左旋错断构造运动,在断裂两分支之间造成转变挤压型地块抬升,形成一菱形地垒。表土层大致均匀分布在地垒及其两侧地区,并且没有被埘北向断裂错动。而表土层所覆盖的古台地亦没有经过明显剥蚀。待得到河沥背表土层及邻近黄竹洋村天然山体滑坡定年结果资料,即可以给出河沥背断裂最新错动年龄范围及断裂活动与区内天然山体滑坡事件的相互关系。  相似文献   

香港海啸监测及警报系统的发展   总被引：1，自引：1，他引：0  

黄永德  李健威 《华南地震》2008,28(2):118-124

地震监测、海啸数值模拟和海平面监测是监测和预报海啸的主要工具。为了有效监测南海北部可能发生的地震海啸,香港天文台（HKO）正在香港筹建一个宽频地震站,同时通过太平洋海啸警报及减灾系统（PTWS）的框架取得美国加州综合地震网（CISN）显示系统的实时地震信息,并通过世界气象组织（WM0）的全球通信系统（GTS）接收南海和西北太平洋的验潮站和海啸浮标数据以监测海面的波动情况。香港天文台通过联合国教科文组织（UNESCO）政府间海洋学委员会（IOC）取得海啸漫滩模式交换计划（TIME）下的海啸数值模式,把香港本地的高分辨率水深和地形数据融合在模式之内,并利用这个模式计算南海多处地区在不同地震情景下的海啸传播,为海啸预报提供重要的参考数据。  相似文献   

地下水位循环变化时隧道开挖对群桩的长期影响研究     

马少坤  邵羽  吕虎  WONG K S  吴宏伟  陈欣  江杰 《岩土力学》2016,37(6):1563-1568

为解决地下水位随季节升降变化时隧道开挖对邻近桩基的长期影响难题,通过三维离心模型试验,研究了地下水位循环变化时隧道对群桩的长期影响。主要分析水位循环变化时地表长期沉降、桩顶长期附加沉降、桩身长期附加弯矩和附加轴力的变化规律。试验结果表明：在隧道附近,地下水位循环变化尤其是降水对地表长期沉降影响更为明显。地表长期附加沉降随着地下水位循环次数增加而增大,且呈衰减式变形,即使经过3次水位升降循环也不能稳定;桩基长期附加沉降显著,其附加沉降量占总沉降量的50%以上;前、后桩的长期附加轴力基本为正值,桩总轴力增加,对既有受压桩极为不利,附加轴力拐点位置及最大值有所区别;经过3次地下水位循环变化后,前、后桩桩身弯矩反弯点个数减少,但桩身最大附加弯矩均明显变大,当达到极限弯矩,桩身出现塑性铰,这对穿越厚软弱层地基中的既有受压柔性桩极为危险。  相似文献