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SCALE EFFECTS OF AIR-WATER FLOWS IN STILLING BASIN OF MULTI-HORIZONTAL SUBMERGED JETS

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Journal of Hydrodynamics 2010年第6期22卷 788-795页

作者： CHEN Jian-gang ZHANG Jian-min XU Wei-lin WANG Yu-rong state key {2. of hydraulics and mountain river engineering Sichuan University Chengdu 610065China

A series of experiments were carried out on multi-horizontal submerged jets with four different model scales of 1：36, 1：57, 1：80, 1：2.0. In routine tests, scale effects have to be considered, due to complex vortex structure and strong air entrainment in stilling basin. Our focus was laid on measuring and analyzing the time-averaged pressure distribution, water depth and closed-to-bed velocity in the stilling basin of multi-horizontal submerged jets. The experiments results show that the model scale has but a slight effect on the time-averaged hydraulic characteristics in the stilling basin of multi-horizontal submerged jets, which indicates that the results of time-averaged hydraulic characteristics for a normal pressure model are reliable. However, the scale effects of air entrainment, fluctuation pressure and vortex structure call for further investigations in order to make the results of experiments serve as scientific references for practical engineering.

关键词： multi-horizontal submerged jets Xiangjiaba hydropower station scale effects experimental investigation hydraulic characteristics

STUDY ON THE ANGLE OF REPOSE OF NONUNIFORM SEDIMENT

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Journal of Hydrodynamics 2009年第5期21卷 685-691页

作者： YANG Feng-guang LIU Xing-nian YANG Ke-jun CAO Shu-you state key {2. of hydraulics and mountain river engineering Sichuan University Chengdu 610065China

A conception of exposure degree is used in this article to account for the hiding and exposure mechanism of nonuniform sediment transport. The force arms of particles on the bed slope are assumed to be a function of the exposure degree, which is stochastically related to the size and gradation of bed materials. Based on this conception, the formula for the angle of repose of nonuniform sediment is developed. The angle of repose of nonuniform sediment is experimentally investigated in rotation drum at the rolling motion of sediment particles. The nonuniform sediment is gotten from the mixture of two kinds of uniform sediment with different weight ratios and two experimental plans that one for changing the weight ratio of two kinds of uniform sediment from 1：9 to 9：1 and the other changing the uniform sediment size and weight ratio are used. The effect of the rotation speed and the filling degree on the angle of repose is investigated, too. Finally, the formula has been tested against a wide range of laboratory data, the prediction by the newly proposed formulas is very good.

关键词： the angle of repose nonuniform sediment rotation drum exposure degree

DESIGN OF GROUNDWATER LEVEL MONITORING NETWORK WITH ORDINARY KRIGING

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Journal of Hydrodynamics 2008年第3期20卷 339-346页

作者： YANG Feng-guang CAO Shu-you LIU Xing-nian YANG Ke-jun state key {2. of hydraulics and mountain river engineering Sichuan University Chengdu 610065China

The primary network of groundwater level observation wells aims at realizing a regional groundwater management policy. It may give a regional picture of groundwater level with emphasis on the natural situation. Observation data from the primary network can be used to estimate the actual state of groundwater system. Since the cost of the installation and maintenance of a groundwater monitoring network is extremely high, the assessment of effectiveness of the network becomes very necessary. Groundwater level monitoring networks are the examples of discontinuous sampling on variables presenting spatial continuity and highly skewed frequency distributions. Anywhere in the aquifer, ordinary kriging provides estimates of the variable sampled and a standard error of the estimate. In this article, the average Kriging standard deviation was used as a criterion for the determination of network density,and the GIS-based approach was analysized. A case study of groundwater level network simulation in the Chaiwopu Basin, Xinjiang Uygur Autonomous Region, china, was presented. In the case study, the initial phreatic water observation wells were 18, a comparison of the three variogram parameters of the three defferent variogram models shows that the Gaussian model is the best. Finally, a network with 55 wells was constructed.

关键词： ordinary Kriging variogram sill nugget effect range groundwater monitoring network

NUMERICAL SIMULATION OF ICE CONTROL EFFECT OF SOLAR ENERGY ON TIBETAN CHANNELS

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Journal of Hydrodynamics 2007年第3期19卷 342-348页

作者： AN Rui-dong CHEN Ming-qian LI Ran Banjiuciren SHI Yun-qiang state key {2. of-hydraulics and mountain river engineering Sichuan University Chengdu 610065 China Rikaze Water Conservancy Institute of Tibet Rikaze 857000 China Tibtan Weather Bureau Lasha 850000 China

With the Tanghe Diversion Channel in Tibet as an example, the theoretical study on the ice control effect of the solar sacks was conducted based on the previous study. The numerical simulation method was adopted and a one-dimensional numerical model for ice crystal in diversion channels in high-altitude cold regions was developed in this article. The heat transfer through the air-water interface and the mass transfer between ice and water were considered in the model. The model was validated by the field observation data on the diversion channel of the Tanghe Hydropower Station. The results show that the ice control effect of the solar sacks is obvious in the channel with large mass flow rate in the high-altitude cold regions.

关键词： solar energy solar sack ice control diversion channel numerical simulation

Design and Development of TGPSIS Based on SuperMap—Map Subsystem

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四川大学学报（工程科学版） 2005年第S1期37卷 133-137页

作者： LI Changzhi~1 LIU Xingnian~2.CAO Shuyou~2.WANG Zhaoyin~(1,3) (1.china Inst.of Water Resources and Hydropower Research,Beijing 100038,china 2.{2. key Lab.of hydraulics and mountain river Eng.,sichuan Univ.,chengdu 610065,china 3.Dept.of Hydraulic Eng.,Tsinghua Univ.,Beijing 100084,china) china Inst. of Water Resources and Hydropower Research Beijing 100038 China Lab. of hydraulics and mountain {2. Eng. Sichuan Univ. Chengdu 610065 China Dept. of Hydraulic Eng. Tsinghua Univ. Beijing 100084 China

The Three Gorges Project (TGP for short) is the key project to train and develop the Yangtze river of{2.,with multi-objects of flood defence,electricity generation,shipping,***,sediment plays an important role in beth constructing of engineering and exerting efficiency of *** attention,there- fore,has been paid to sediment problem of TGP since the very beginning of this engineering's *** to now,much observed data and fruitful researches about TGP have come into being,and a sci...

关键词： TGPSIS sediment design and development

A Preliminary Study on 1D Numerical Experiment of Water Debris Flow in Gully

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四川大学学报（工程科学版） 2005年第S1期37卷 143-147页

作者： LIU Tonghuan~1 WANG Xiekang~1 CUI Peng~2.(1.state key Lab.of {2. and mountain river Eng.,sichuan Univ.,chengdu 610065,china 2.Inst.of mountain Hazards and Environment,Chinese Academy of Sci.,chengdu 610041,china)

In order to improve and enhance the numerical modeling methods and its application on debris flow problems,a preliminary study has been proposed in accordance with the corrected water-sediment numerical model on the premise of revised resistance and sediment capacity ***,an overview the recent re- search achievements on numerical simulation of debris flow has been conducted,the results shown that a gener- al numerical model for debris flow can not be existed at all because the complex rheol...

关键词： Water debris flow Saint-Venant equation Numerical experiment

An Investigation of Stochastic Nature of Bed Load Motion in Chuanjiang river

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四川大学学报（工程科学版） 2005年第S1期37卷 112-117页

作者： ZHANG Zhixiang~1 HE Wenshe~(1,2. YANG Kejun~1 (1.state key Lab.of {2. and mountain river Eng.,sichuan Univ.,chengdu 610065,china 2.china Three Gorges Project Corporation,Yichang 443002.china)

Bed Load Motion and its transport rate is one of the basic issues in river *** this paper, the authors discussed the stochastic nature of bed load motion in Chuanjiang river in *** lies in the upstream reach of Yangtze *** stochastic nature is shown in the following four ***, even though all the conditions are the same,due to the fluctuation of the flow,the bed load discharge and the location and width of sediment transport belts are ***,during the ...

关键词： pebble bed load motion Chuanjiang river stochastic nature sediment transport rate

Incipient Motion of Bed Load Sediment and Its Application in the Three Gorges Hydro Project

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四川大学学报（工程科学版） 2005年第S1期37卷 102-105页

作者： HE Wenshe~(1,3) CAO Shuyou~2.YUAN Jie~3 DAI Huichao~3 (1.Lanzhou Jiao Tong Univ.,Lanzhou 730070,china 2.state {2. Lab.of hydraulics and mountain river Eng.,sichuan Univ.,chengdu 610065,china 3.china Yangtze Three Gorges Project Development Corporation,Hubei Yichang 443002.china) Lanzhou Jiaotong Univ. Lanzhou 730070 China china Yangtze Three Gorges Project Development Corporation Yichang 443002 China state key Lab. of {2. and mountain river Eng. Sichuan Univ. Chengdu 610065 China

A formula for the calculation of critical shear stress of non-uniform sediment was developed by on river bed has been established while considering the relative degree expose of *** values of the Coeffi- cients in the formula have been *** formula has been verified with prototype observation data, flumes data of both nature and lightweight *** computed results fully reflect the characteristics of thresh- old motion of non-uniform *** result have been used in some physical mo...

关键词： non-uniform sediment incipient motion bed load Three Gorges Hydro Project

Geo-engineering Lessons Learned from the 2.08 Wenchuan Earthquake in sichuan and Their Significance to Reconstruction

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Journal of mountain Science 2011年第2期8卷 176-189页

作者： HUANG Runqiu state key {2. of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 610059 Sichuan China

The 2.08 Wenchuan earthquake in sichuan of china was the result of quake-triggering along an active several hundred-kilometer-long fault. The subsequent landslides and debris flow geohazards are dominating factors in planning post-disaster recovery and rebuilding. This paper presents recommendations for coping with large-scale geohazards and disasters. It is essential to establish a national emergency management system for huge scale catastrophe and earthquake precursor identification. Town construction must be kept away from active faults, especially to improve town safety in areas with high risk of seismic and geological hazards, and it is important to improve geohazard investigation and remediation for {2. areas that have become loosened by earthquake activity. Geological factors must be better understood to reduce direct and secondary risks and effects of earthquakes. Site selections for public relocation require clear and informed analysis of geological and social risk reduction, so that relocation, infrastructure reconstruction, and commemorative relic-sites can be protected.

关键词： Wenchuan Earthquake Geohazard Reconstruction