EXPERIMENTS ON FLOW AROUND A CYLINDER IN A SCOURED CRANNEL BED

1 INTRODUCTION'LOcal scour around a pier is a result of the interatiOn amongst the pier, the aPproach flow and theerodible bed. The Presence of a pier results in a stagnation pressure build-up in front of the pier and athree-dimensional tUrbulent flow echaracterized by the downward flow ahead of the pier and the so-called horseshoe vortex along the base of the Pier forms itself The flow modifies the erothe bed inthe vicinity of the pier when local scour takes place (Graf and AJhnakar l…     

附录A 通道命名

２通过标志：Ｇ·倾斜仪仪器代码：Ａ定向代码：ＮＥ倾角／方位角：地动矢量信号单位：Ｒａｄｉｎｓ通过标志：Ｇ·地震检波器（甚短周期，固有频率５－１０Ｈｚ或用大）仪器代码：Ｐ定向代码：ＺＮＥ倾角／方位角：地动矢量信号单位：Ｍ，Ｍ／Ｓ通道标志：Ｇ·地磁仪仪器代码：Ｆ定向代码：ＺＮＥ信号单位：Ｔ（Ｔｅｓｌａｓ）通道标志：Ｇ·蠕动仪仪器代码：Ｂ定向代码：未知倾角／方位角：ＡＩｏｎｇｔｈｅｆａｕＩｔｏｒｗｉｒｅｖｅｃｔｏｒ信号单位：Ｍ通过标志：Ｇ·线性应变仪器代码：Ｓ定向代码：ｚＮＥ倾角／方位角：沿仪器的轴向信号单位：Ｍ／Ｍ通道标志：Ｇ·体应变仪器代码：ｖ定向代码：未知倾角／方位角：量为零信号单位：Ｍ３／Ｍ３通过标志：Ｇ·潮汐仪器代码：Ｔ定向代码：未知倾角／方位角：垂直信号单位：Ｍ（海平面或海洋深度）通过标志：Ｇ·降雨仪器代码：Ｒ定向代码：未知倾角／方位角：置为零信号单位：Ｍ，Ｍ／Ｓ通过标志：Ｗ·风仪器代码：ｗ定向代码：Ｓ风速Ｄ风向矢量（以真北──地理北为参考）倾角／方位角：置为零通过标志：Ｗ·温度仪器代码：Ｋ定向代码：Ｏ室外环境Ｉ室内Ｄ井下１２３４电器柜内倾角／方位角：置为零信号单位：Ｃ或Ｋ（度）通过标志：Ｗ或Ｈ·湿度     

A) A.I.H.S.—I.A.S.H.

Abstract

Mathematical models are the means to characterize variables quantitatively in many groundwater problems. Recent advances in applied mathematics have perfected what is now called Adomian's decomposition method (ADM), a simple modelling procedure for practical applications. Decomposition exhibits the benefits of analytical solutions (i.e. stability, analytic derivation of heads, gradients, fluxes and simple programming). It also offers the advantages of traditional numerical methods (i.e. consideration of heterogeneity, irregular domain shapes and multiple dimensions). In addition, decomposition is one of the few systematic procedures for solving nonlinear equations. By far its greatest advantage is its simplicity of application. It may produce simple results for preliminary simulations, or in cases with scarce information. The method is described with simple applications to regional groundwater flow. Many applications in groundwater flow and contaminant transport are available in the literature.

Editor D. Koutsoyiannis; Associate editor Xi Chen

Citation Serrano, S.E., 2013. A simple approach to groundwater modelling with decomposition. Hydrological Sciences Journal, 58 (1), 1–9.     

BED SHEAR IN EVOLVING SCOUR AT A CYLINDER:A THEORETICAL APPROACH

ＢＥＤＳＨＥＡＲＩＮＥＶＯＬＶＩＮＧＳＣＯＵＲＡＴＡＣＹＬＩＮＤＥＲ：ＡＴＨＥＯＲＥＴＩＣＡＬＡＰＰＲＯＡＣＨＳｕｂｈａｓｉｓｈＤＥＹ１ａｎｄＳｒｉｊｉｂＫ．ＫＡＲ２Ａｂｓｔｒａｃｔ：Ｔｈｅｔｅｍｐｏｒａｌｖａｒｉａｔｉｏｎｏｆｓｈｅａｒｓｔｒｅｓｓ...     

A.—A. I. H. S.—I. A. S. H.

Abstract

When a river flows into a reservoir, the solid materials it carries sink to the bottom thus reducing the potential reservoir capacity. The suspended load of eight major western rivers flowing into Kainji Lake was determined as a part of the investigation of the suspended sediment of the reservoir. The sediment content in each sample was determined in parts per million.

On the whole the results of this study is in agreement with the previous conclusion that the sediment load of the Niger was low. A range of 29–221 ppm was observed within the reservoir whereas the concentration in the inflowing rivers varied from 122–953 ppm. It was however not possible to determine the total sediment load because discharge data were lacking.

The data presented herein confirm the earlier conclusion that the rate of silting is slow but indicate that locally high rate of sediment supply should give cause for anxiety regarding the possible growth of deltas as the months of these rivers.

The full potential of this study is difficult to assess at this stage but it has revealed a number of problem areas worth looking into in future years. A number of future studies believed to be capable of giving the necessary data for operation and management of the reservoir are recommended.     

世界资料中心 A 概况

第七篇文章是以作者在参观访问中所获得的第一手资料,汇编介绍了世界资料中心 A 的概况,及其组织结构和研究工作内容等。     

A Brief Account of Professor

LiDaoyong,graduatedinforeignladingesandliteratureatWuhanUniversityin1948,isaretiredprofessoratEncyclopediaofChinaPublishingHouse,amemberoftheChineseTranslators'andInterpreters'Association.HismainsparetimepublicationsrelevanttoEnglishasfollows:Chiefed...     

A possible UL Fseismice lectro-magnetic emission

ＡｐｏｓｓｉｂｌｅＵＬＦｓｅｉｓｍｉｃｅｌｅｃｔｒｏ－ｍａｇｎｅｔｉｃｅｍｉｓｓｉｏｎＸｉｎｇ－ＣａｉＬＩ；（李兴才）Ｈｕｉ－ＸｉｎＣＡＯ；（曹惠馨）Ｔｉｅ－ＨｏｎｇＹＵ；（俞铁宏）ａｎｄＺｈｉ－ＹｏｎｇＣＨＥＮ；（＠２陈智勇）（Ｉｎｓｔｉｔｕｔｅｏ...     

地震A、B、C

地震Ａ、Ｂ、Ｃ张少泉稍稍上了年纪的北京市民，大都有过地震的体验。但人们要问：地震是怎么回事？震中是怎么测定的？地震之前能不能打个招呼？这些问题，不一定谁都能说得清楚。我们希望，这篇短文，能在迫切需要地震知识的社会公众与从事地震研究的科学家之间架起一座...     

COARSE-PARTICLE TRANSPORT IN A GRAVEL-BED RIVER

ＣＯＡＲＳＥ－ＰＡＲＴＩＣＬＥＴＲＡＮＳＰＯＲＴＩＮＡＧＲＡＶＥＬ－ＢＥＤＲＩＶＥＲＷｉｌｌｉａｍＷ．ＥＭＭＥＴＴ１，ＲｏｂｅｒｔＬ．ＢＵＲＲＯＷＳ２，ａｎｄＥｄｗａｒｄＦ．ＣＨＡＣＨＯ，Ｊｒ３．（１Ｕ．Ｓ．ＧｅｏｌｏｇｉｃａｌＳｕｒｖｅｙ，Ｗａｔｅ...     

WATER MANAGEMENT—A GENERAL REPORT

Abstract

This analysis was undertaken to develop appropriate extreme flood design criteria for a nuclear power plant at Halileh, near Bushehr, Iran, adjacent to the Persian Gulf. Graphical relationships presented provide a convenient means of estimating the probable maximum precipitation and the 2- to 100-year return period rainfall events with durations from 5 min to 24 h. The relationships may be applied for drainage areas up to 25 km². Probable maximum precipitation and 2- to 100-year return period rainfall events were estimated. Precipitation depth-duration relationships were derived.     

A Review of Seismicity in 2005

1SURVEY OF GLOBAL SEISMICITYIN2005In2005,atotal of16strongearthquakes recordingMS≥7.0occurredinthe world,accordingtothe Chinese Seismic Station Network(Table1).The strongest earthquake registeringMS8.5strucknear the northwest coast of Sumatra on March29,2005(Fig.1).In2005,the frequency and energyrelease of earthquakes were reduced compared to a year earlier.The characteristics of the seismicityare as follows:Fig.1The distribution of global earthquakes registeringMS≥7.0during…     

A MATHEMATICAL MODEL OF RESERVOIR SEDIMENTATION

1 INTRODUCTIONBed aggradation and degradation haPpen to be the most imPOrtant aspects of the alluvial processes instreams if the equilibrium conditions among water discharge, sediment flow, and channel shaPe areclistuIbed by natural or man-made factOfs, e.g., the constrUchon of a dam, change in the sediment suPplyrate, or base level changing. Reliable and quanhtative estimation of the bed aggradation or degradation isimPortant in rivertalning engineering and water management projects. …     

A Review of Seismicity in 1998

I. SURVEY OF GLOBAL SEISMICITY IN 1998 A total of 17 earthquakes with M_s≥7.0 occurred in the world in 1998 according to the determination by the Chinese Seismic Station Network. The strongest earthquake occurred in Sulawesi, Indonesia (M_s7.8, November 5, 1998). The next strongest earthquake was the South Pacific Ocean earthquake (M_s7.7, March 25, 1998) and the Ryukyu earthquake (M_s7.7, May 4) (Fig. 1).     

A κ Model for Mainland France

An important parameter for the characterization of strong ground motion at high-frequencies (>1 Hz) is kappa, κ, which models a linear decay of the acceleration spectrum, a(f), in log-linear space (i.e. a(f) = A ₀ exp(? π κ f) for f > f _E where f is frequency, f _E is a low frequency limit and A ₀ controls the amplitude of the spectrum). κ is a key input parameter in the stochastic method for the simulation of strong ground motion, which is particularly useful for areas with insufficient strong-motion data to enable the derivation of robust empirical ground motion prediction equations, such as mainland France. Numerous studies using strong-motion data from western North America (WNA) (an active tectonic region where surface rock is predominantly soft) and eastern North America (ENA) (a stable continental region where surface rock is predominantly very hard) have demonstrated that κ varies with region and surface geology, with WNA rock sites having a κ of about 0.04 s and ENA rock sites having a κ of about 0.006 s. Lower κs are one reason why high-frequency strong ground motions in stable regions are generally higher than in active regions for the same magnitude and distance. Few, if any, estimates of κs for French sites have been published. Therefore, the purpose of this study is to estimate κ using data recorded by the French national strong-motion network (RAP) for various sites in different regions of mainland France. For each record, a value of κ is estimated by following the procedure developed by Anderson and Hough (Bull Seismol Soc Am 74:1969–1993, 1984): this method is based on the analysis of the S-wave spectrum, which has to be performed manually, thus leading to some uncertainties. For the three French regions where most records are available (the Pyrenees, the Alps and the Côtes-d’Azur), a regional κ model is developed using weighted regression on the local geology (soil or rock) and source-to-site distance. It is found that the studied regions have a mean κ between the values found for WNA and ENA. For example, for the Alps region a κ value of 0.0254 s is found for rock sites, an estimate reasonably consistent with previous studies.     

A Review of Seismicity in 2004

1 SURVEYOFGLOBESEISMICITYIN 2 0 0 4Atotalof 1 9strongearthquakeswithMS≥ 7 0occurredintheworldaccordingtotheChineseSeismicStationNetworkin 2 0 0 4 (Table 1 ) .ThestrongestearthquakewastheSumatraearthquakewithMS8 7nearthenorthwestcoastofSumatraonDecember 2…     

A Review of Seismicity in 1995

1. SURVEY OF SEISMICITY IN CHINA IN 1995 A total of 48 earthquakes with M_s≥5.0 occurred in China in 1995 (30 on the Chinese mainland and offshore, 1 in the South China Sea, and 17 in Taiwan) (Fig. 1). Among these, 8 earthquakes were     

A Review of Seismicity in 1996

Ⅰ. SURVEY OF THE GLOBAL SEISMICITY A total of 28 earthquakes of M_s ≥7.0 occurred over the entire world in 1996 according to the determination by the Chinese Seismic Station Network. The strongest one is the Irian earthquake (M_s 7.9, February 17, 1996, Indonesia) (Fig. 1). It is considered that the global seismicity in 1996 is still situated in the active period based on the comprehensive analysis of its frequency, magnitude, and range.