Le barrage OA-10B, un exemple de construction d'un barrage sur des dépôts d'origine glaciaire

1985 ◽  
Vol 12 (4) ◽  
pp. 838-848
Author(s):  
Michel Massiéra ◽  
Claude Pelchat

The OA-10B dam is one of the earth structures of the EOL (Eastmain – Opinaca – La Grande) project within the "La Grande" hydroelectric complex at James Bay, in the northwest of Quebec. Three rivers, the Eastmain, Petit Opinaca, and Opinaca, were diverted to the La Grande River to increase the hydropotential of the LG-2 power plant. Dam OA-10B, 25 m high, has a zoned section with an impervious moraine central core, and rests mainly on overburden foundations consisting of heterogeneous deposits of glacial till. The paper describes the different construction phases of the dam with emphasis on foundation treatments. Key words: construction, core trench, dam, dewatering, excavation, foundation, glacial till, instrumentation, moraine, treatment.

1983 ◽  
Vol 10 (4) ◽  
pp. 614-626
Author(s):  
Michel Massiéra ◽  
Claude Pelchat

The OA-5 Dam is one of the earth structures of the EOL (Eastman–Opinaca–La Grande) project within the 'La Grande' hydro-electric complex at James Bay, Quebec. Three rivers were diverted to the La Grande River to increase the hydro-electrical potential of the LG-2 power plant. Dam OA-5 (32.3 m high and 385.6 m long) has a zoned section with an impervious central core, and rests on bedrock.The paper describes the different construction phases of the dam, i.e., Opinaca River diversion and closure, foundation treatments, earth and rockfill placement, quality control of materials, and the behaviour of the dam during and after filling of the reservoir. Keywords: closure, compaction, construction, dam, diversion, earth and rockfill, glacial till, grain size analysis, gravel, river, sand.


1986 ◽  
Vol 13 (5) ◽  
pp. 558-568
Author(s):  
Michel Massiéra

The Opinaca spillway is one of the concrete structures of the EOL (Eastmain – Opinaca – La Grande) project within the "La Grande" hydroelectric complex at James Bay, Quebec. Three rivers were diverted to the La Grande River to increase the hydroelectric potential of the LG 2 power plant. Opinaca spillway is a reinforced concrete structure 28.7 m wide and 46.6 m long with intake and restitution channels excavated in the rock. This paper describes the different construction phases of the spillway with emphasis on rock excavation and support, grouting, concreting, and quality control. Key words: blasting, bolting, concreting, dowel, excavation, grouting, presplitting, rock, shotcrete, spillway.


2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Elsa Karino

Production is an activity to convert inputs into outputs through the transformation process. Input in the form of man, money, method, material, machine. While the output is in the form of goods or services. The purpose of production in general is to meet individual needs. There are several factors that influence production namely land and all economic potential that is processed and cannot be separated from the production process, labor is directly related to the demands of property rights through production, and capital, management and technology. In production there are various types of production, namely production which is intermittent and continuous. The production, if viewed from an Islamic perspective, it must fulfill the following principles. First, produce in a halal circle. Second, managing natural resources in production is interpreted as the process of creating wealth by utilizing natural resources must rely on the vision of the creation of this nature and along with the vision of human creation, namely as a blessing for all nature. Third, the Caliph on the earth is not only based on the activity of producing the usefulness of an item but work is done with the motive of benefiting to seek the pleasure of Allah SWT. Key Words: Production, Red Sugar, benefiting


1942 ◽  
Vol 32 (1) ◽  
pp. 19-29
Author(s):  
K. E. Bullen

ABSTRACT A detailed analysis of the problem of the earth's density variation has been extended to the earth's central core. It is shown that in the region between the outer boundary of the core and a distance of about 1400 km. from the earth's center the density ranges from 9.4 gm/cm.3 to 11.5 gm/cm.3 within an uncertainty which, if certain general assumptions are true, does not exceed 3 per cent. The density and pressure figures are, moreover, compatible with the existence of fairly pure iron in this part of the earth. The result for the earth's outer mantle as given in a previously published paper, together with those in the present paper, are found to give with good precision the density distribution in a region occupying 99 per cent of the earth's volume. Values of the density within 1400 km. of the earth's center are subject, however, to a wide margin of uncertainty, and there appears to be no means of resolving this uncertainty for the present. The most that can be said is that the mean density in the latter region is greater than 12.3 gm/cm.3 and may quite possibly be several gm/cm.3 in excess of this figure. In the present paper figures are also included for the variation of gravity and the distribution of pressure within the central core. The gravity results are shown to be subject to an appreciable uncertainty except within about 1000 km. of the outer boundary of the core, but the pressure results are expected to be closely accurate at all depths.


1969 ◽  
Vol 59 (5) ◽  
pp. 2079-2099
Author(s):  
John S. Derr

abstract All observations of the free oscillations of the Earth published through 1968 are weighted to produce a set of means and standard errors of the means. Fundamental orders 0 to 97 for spheroidal and 2 to 99 for torsional are treated, as well as many overtones up to order 49. Statistical tests indicate that some observations are path dependent at the 99 per cent confidence level. Comparison of these means and standard errors with published Earth models indicate that they form a consistent basis for inversion of free oscillation observations to infer Earth structures.


2016 ◽  
Vol 832 ◽  
pp. 131-136
Author(s):  
Jozefína Pokrývková ◽  
Jakub Fuska ◽  
Viliam Bárek

Satisfying of increasing demands of society has often resulted in uncontrolled discharges of harmful substances into the atmosphere. The situation is gradually improving over the past 50 years, but the environmental impact is still evident and it must be monitored and evaluated. Reduction of emissions released into the atmosphere and reduction of air pollution impact on the Earth surface occurs due to development of new methods and technologies in the industry and legislation. This paper deals with the possibilities of the two methods of the SO2 concentration measurements - sorption - cumulative and ultraviolet fluorescent method at the location of the power plant Novaky. In the imission area is built automated measuring station (AMS) Oslany (operated by ENVITECH, managed by Slovak Hydrometeorological Institute Bratislava) as the measure of the total concentration of the pollutant. The research have shown that the maximum concentration detected in this area reached up to 64.46 µg.m-3 of SO2


1992 ◽  
Vol 29 (2) ◽  
pp. 195-207 ◽  
Author(s):  
D. Y. F. Ho ◽  
D. G. Fredlund ◽  
H. Rahardjo

The paper presents the volume change theory and the designation of associated soil properties that must be measured for an unsaturated soil. The equipment required for the measurement of each of the relevant volume relationships is described. Several testing procedures for obtaining the volume change indices during loading and unloading of an unsaturated soil are presented. Typical results from loading and unloading tests on compacted silt and compacted glacial till specimens are presented and analyzed. The analysis is given in order to illustrate the application of the volume change theory to practical problems. Key words : unsaturated soil, volume change indices, constitutive relations, coefficients of volume change, oedometer tests.


1979 ◽  
Vol 36 (1) ◽  
pp. 81-84 ◽  
Author(s):  
Ronald M. Leithiser ◽  
Karl F. Ehrlich ◽  
Alan B. Thum

A high volume pump (2.5 m3/min capacity at 6 m head) and conventional plankton nets (0.5 and 1.0 m diam) were operated side by side in two tests to evaluate the efficiency of each gear for sampling fish larvae within the intake structure of a coastal power plant. At intake channel current velocities up to 40 cm/s (the maximum tested), the pump in one test caught significantly more fish larvae than the nets. Compared to the pump, both sizes of plankton nets in each test greatly undersampled large larvae (over 5.0 mm total length). Our findings suggest that conclusions regarding ichthyoplankton entrainment based on data obtained with conventional plankton nets may be of questionable validity. Key words: ichthyoplankton, entrainment, pump, nets


2020 ◽  
Author(s):  
Flavia Bruno

<p>I teach Natural Sciences in a Liceo Artistico, a type of secondary school in Italy. It is designed to give students the skills to progress to any university, but specifically devoted to art related topics.<br>During my career I have been following the national educational standard of the Ministero dell’Istruzione, dell’Università e della Ricerca of my Country.<br>During the years students are involved in meaningful hands-on activities   such as the study of the rocks in the country, preparation of easy chemical reactions and observations through a microscope of vegetal and animal organisms. These last ones are very interesting in a Liceo Artistico where many topics focus on the study of the morphology.<br>The theory confirms what the students learn during the practical activities, furthermore it is important to acquire a correct scientific terminology as well as to be able to express scientific issues.<br>I teach during the year the following main topics:<br>Science of Earth: the Solar System, the two motions of the Earth, structures of the Earth surface (rivers, lakes, glaciers, oceans and seas), the Earth’s Spheres, the movement of lithospheric plates.<br>Biology: the characteristics and functions of living organisms especially the cells and the biodiversity. The Evolution, Mendel’s genetic laws, organism-environment relationship in order to valorize and to maintain the biodiversity. Chemistry: state of matter, classification of matter, the Mendeleev’s Periodic Table, the main chemical reactions, atomics models, chemical bonds, chemical nomenclature.<br>The extra-curricular course proposal of my school (POFT-Piano dell’Offerta Formativa Triennale) includes my project whose title is “Science and creativity”. The achievement is to create a link between scientific subjects and the art ones in order to approach knowledge which appear distant but have really many points to share.<br>Every year some classrooms study different topics such as the Nanoparticles, Biomimetic and this year the Adaptations of the animals.<br>After a scientific conference, plastic models and graphic drawings will be realised by the students, who starting from the scientific reality, can express their creativity.<br>During the years I organize some educational visits for example to the Botanic Garden as well as to the countryside; in this way the students have opportunities to create an e-book with texts and photographs.<br>For instance two years ago my classroom created an e-book with botanical cards and the following year another one with the title “Rocce a Milano” where students took pictures and texts about this topic.<br>Many classrooms and teachers are involved in this project for example Plastic and Drawing teachers, as well as Multimedia teachers. I manage to gather the interested teachers and to realize the projects.<br>With our productions we participate in competitions and we are sometimes selected.</p>


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