Evidence for changes in the dynamics of Earth crust tilts caused by the large dam construction and reservoir filling at the Enguri dam international test area (Georgia)

2011 ◽  
Vol 66 (4) ◽  
pp. 523-529 ◽  
Author(s):  
Teimuraz Matcharashvili ◽  
Tamaz Chelidze ◽  
Vakhtang Abashidze ◽  
Natalia Zhukova ◽  
Ekaterine Mepharidze ◽  
...  
Keyword(s):  
Test Area ◽  
Dam Construction ◽  
Reservoir Filling ◽  
Large Dam

Grand Canyon Dams, Split-Twig Figurines, and “Hit-and-Run” Archaeology

1968 ◽  
Vol 33 (3) ◽  
pp. 341-351 ◽  
Author(s):  
Stephen C. Jett
Keyword(s):  
Long Range ◽  
Grand Canyon ◽  
Environmental Context ◽  
Dam Construction ◽  
Hit And Run ◽  
Large Dam ◽  
Range Study

AbstractIn 1966 and 1967, amateurs unearthed a number of split-twig figurines in Stanton Cave in the Grand Canyon’s Marble Gorge. A number of these figurines are described, including one which is perhaps the finest ever discovered. It is documented that these finds by amateurs were stimulated by publication about this site in popular periodicals. It is also argued, using the Grand Canyon as an example, that survey and salvage in connection with large dam construction is never a substitute for long-range study of the archaeology and its environmental context, and that salvage cannot be considered as a benefit justifying dam construction but only as an alleviation of some of the dam damage.

Social impacts of a large-dam construction: the case of Castanhão, Brazil

2019 ◽  
Vol 44 (8) ◽  
pp. 871-885
Author(s):  
Carlos Enrique Tupiño Salinas ◽  
Vládia Pinto Vidal de Oliveira ◽  
Liana Brito ◽  
André V. Ferreira ◽  
José Carlos de Araújo
Keyword(s):  
Social Impacts ◽  
Dam Construction ◽  
Large Dam

scholarly journals Continuity effects on rotifers and microcrustaceans caused by the construction of a downstream reservoir in a cascade series (Iguaçu River, Brazil)

2016 ◽  
Vol 76 (2) ◽  
pp. 279-291 ◽  
Author(s):  
M. Serafim-Júnior ◽  
F. A. Lansac-Tôha ◽  
R. M. Lopes ◽  
G. Perbiche-Neves
Keyword(s):  
Environmental Variables ◽  
Distinct Species ◽  
Multidimensional Analysis ◽  
Dam Construction ◽  
Negative Effects ◽  
Positive Effects ◽  
Filling Phase ◽  
Reservoir Filling ◽  
Iguaçu River ◽  
New Reservoir

Abstract This study evaluated changes in the community of rotifers and microcrustaceans associated with the construction of a large and dendritic reservoir in Iguaçu River (Brazil), as the last reservoir of a sequence of five cascading systems. Differences were clear between pre-filling and post-filling phases for organisms and some of environmental variables. In the pre-filling phase, the community was more homogeneous along the downstream river gradient, and spatial compartmentalization in the new reservoir was common during the post-filling phase. From 140 identified taxa, 10 species occurred exclusively in the pre-filling phase and 32 in the post-filling phase. After completion of the fifth reservoir filling-up, opportunistic, pioneer and fast-developing species quickly dominated, and downstream of the fourth reservoir the pre-filling decreasing gradient of richness, diversity and evenness disappeared. Richness of rotifers and cladocerans, cladocerans diversity, and evenness of rotifers, cladocerans and copepods were generally higher in the post-filling phase. A non-metric multidimensional analysis based on a presence/absence matrix depicted a homogeneous and dense group of species associated to the pre-filling phase and a second, dispersed group related to the post-filling phase. Spearman correlations pointed out significant positive effects of transparency on rotifer species richness in the post-filling phase, and negative effects on the microcrustacean richness in the pre-filling phase. Dam construction caused disruption of the downstream lotic gradient along the series of dams, leading to the development of distinct species in lentic spatial compartments.

scholarly journals Impacts of a large hydroelectric dam on the Madeira River (Brazil) on floodplain avifauna

2021 ◽  
Vol 51 (4) ◽  
pp. 298-310
Author(s):  
Tomaz Nascimendo de MELO ◽  
Marconi Campos CERQUEIRA ◽  
Fernando Mendonça D’HORTA ◽  
Hanna TUOMISTO ◽  
Jasper Van DONINCK ◽  
...  
Keyword(s):  
Amazon Basin ◽  
Bird Species ◽  
Floodplain Forest ◽  
Dam Construction ◽  
Automated Classification ◽  
Forest Sites ◽  
Madeira River ◽  
Seasonally Flooded ◽  
Successional Vegetation ◽  
Reservoir Filling

ABSTRACT Hydroelectric dams represent an important threat to seasonally flooded environments in the Amazon basin. We aimed to evaluate how a dam in the Madeira River, one of the largest tributaries of the Amazonas River, affected floodplain avifauna. Bird occurrence was recorded through simultaneous passive acoustic monitoring in early successional vegetation and floodplain forest downstream from the dam and upstream in sites impacted by permanent flooding after dam reservoir filling. Species were identified through manual inspection and semi-automated classification of the recordings. To assess the similarity in vegetation between downstream and upstream sites, we used Landsat TM/ETM+ composite images from before (2009-2011) and after (2016-2018) reservoir filling. Downstream and upstream floodplain forest sites were similar before, but not after dam construction. Early successional vegetation sites were already different before dam construction. We recorded 195 bird species. While species richness did not differ between upstream and downstream sites, species composition differed significantly. Ten species were indicators of early successional vegetation upstream, and four downstream. Ten species were indicators of floodplain forest upstream, and 31 downstream. Seven of 24 floodplain specialist species were detected by the semi-automated classification only upstream. While we found some bird species characteristic of early successional vegetation in the upstream sites, we did not find most species characteristic of tall floodplain forest. Predominantly carnivorous, insectivorous, and nectarivorous species appear to have been replaced by generalist and widely distributed species.

A Global Review of Large Dam Construction

2013 ◽  
pp. 1-23 ◽  
Author(s):  
Pu Wang ◽  
Shikui Dong ◽  
James P. Lassoie
Keyword(s):  
Dam Construction ◽  
Large Dam

La tranchée à boue lourde du barrage OA-11

1987 ◽  
Vol 14 (6) ◽  
pp. 844-856
Author(s):  
Michel Massiéra ◽  
Jean-Jacques Paré
Keyword(s):  
Quality Control ◽  
Power Plant ◽  
Key Words ◽  
Water Diversion ◽  
Maximum Height ◽  
Dam Construction ◽  
Slurry Trench ◽  
Crest Length ◽  
The Right ◽  
Reservoir Filling

The OA-11 dam is the most important impounding structure of the Opinaca reservoir created by the water diversion of the Eastmain, Petit Opinaca and Opinaca rivers to the La Grande River to increase the hydroelectric potential of the LG-2 power plant. With a maximum height of 32.2 m and a crest length of 3214 m, this earthfill dam was built on relatively pervious fluvio-glacial deposits that made it necessary to use two impervious deep cutoffs (a slurry trench and a cast-in-place concrete panel wall). On the right shore, a slurry trench, 2180 m long, 1.5 m wide, and varying in depth from 3 to 22.7 m, was built.This paper describes the different construction phases of the slurry trench with emphasis on excavation and backfilling, and quality control. The slurry trench performance has been assessed in terms of the pore pressures developed in the foundation and at the toe during and after reservoir filling. Key words: dam, construction, cutoff, excavation, foundation, backfilling, soil–bentonite mixture, slurry trench, treatment.

Depoliticized Environments: The End of Nature, Climate Change and the Post-Political Condition

2011 ◽  
Vol 69 ◽  
pp. 253-274 ◽  
Author(s):  
Erik Swyngedouw
Keyword(s):  
Industrial Revolution ◽  
Birth Date ◽  
Dam Construction ◽  
Geological Time ◽  
Political Condition ◽  
Sea Levels ◽  
The Holocene ◽  
Climatic Environment ◽  
The Impact ◽  
Large Dam

Nobel-price winning atmospheric chemist Paul Crutzen introduced in 2000 the concept of the Anthropocene as the name for the successor geological period to the Holocene. The Holocene started about 12,000 years ago and is characterized by the relatively stable and temperate climatic and environmental conditions that were conducive to the development of human societies. Until recently, human development had relatively little impact on the dynamics of geological time. Although disagreement exists over the exact birth date of the Anthropocene, it is indisputable that the impact of human activity on the geo-climatic environment became more pronounced from the industrial revolution onwards, leading to a situation in which humans are now widely considered to have an eco-geologically critical impact on the earth's bio-physical system. The most obvious example is the accumulation of greenhouse gases like CO2and Methane (CH4) in the atmosphere and the changes this induces in climatic dynamics. Others are the growing homogenization of biodiversity as a result of human-induced species migration, mass extinction and bio-diversity loss, the manufacturing of new (sub-)species through genetic modification, or the geodetic consequences resulting from, for example, large dam construction, mining and changing sea-levels.

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