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You searched for: Subject term dams (hydrology) Remove constraint Subject term: dams (hydrology) Subject term concrete Remove constraint Subject term: concrete
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1. Bathymetry and siltation rate for Dokan Reservoir, Iraq

Author:
Rebwar Hassan; Nadhir Al‐Ansari; Ammar A. Ali; Salahalddin S. Ali; Sven Knutsson
Source:
Lakes & reservoirs 2017 v.22 no.2 pp. 179-189
ISSN:
1320-5331
Subject:
clay; concrete; dams (hydrology); gravel; gravity; lakes; rivers; sand; sandy clay soils; sediment deposition; silt; silty clay soils; surveys; water reservoirs; Iraq
Abstract:
... The Dokan Reservoir dam is a concrete cylindrical arch with gravity abutments, located on the Lesser Zab River about 60 km from the city of Sulaimani in north‐eastern Iraq. A bathymetric survey was conducted in November 2014 for a period of 10 days, using an echo sounder of 200‐kHz single beam. The survey results indicated an annual average sediment deposition of 3.8 million m³. Thirty‐two sedimen ...
DOI:
10.1111/lre.12173

2. Bed-Load Transport in Two Different-Sized Mountain Catchments: Mlynne and Lososina Streams, Polish Carpathians

Author:
Artur Radecki-Pawlik; Piotr Kuboń; Bartosz Radecki-Pawlik; Karol Plesiński
Source:
Water 2019 v.11 no.2 pp. -
ISSN:
2073-4441
Subject:
bedload; concrete; culverts; dams (hydrology); flood control; floods; gravel; human resources; lakes; mountains; prediction; river engineering; riverbank protection; rivers; sand; sediment deposition; spring; stream channels; water reservoirs; watersheds
Abstract:
... The prediction and calculation of the volume of gravel and/or sand transported down streams and rivers—called bed-load transport is one of the most difficult things for river engineers and designers because, in addition to field measurements, personnel involved in such activities need to be highly experienced. Bed-load transport treated by many engineers marginally or omitted and often recei ...
DOI:
10.3390/w11020272

3. Behind an ambitious megaproject in Asia: The history and implications of the Bakun hydroelectric dam in Borneo

Author:
Benjamin K. Sovacool; L.C. Bulan
Source:
Energy policy 2011 v.39 no.9 pp. 4842-4859
ISSN:
0301-4215
Subject:
basins; concrete; dams (hydrology); economies of scale; energy; infrastructure; interviews; livelihood; politics; poverty; rain forests; rivers; Borneo; Malaysia
Abstract:
... Using a case-study, inductive, narrative approach, this article explores the history, drivers, benefits, and barriers to the Bakun Hydroelectric Project in East Malaysia. Situated on the island of Borneo, Bakun Dam is a 204m high concrete face, rock filled dam on the Balui River in the Upper Rajang Basin in the rainforests of Sarawak. Bakun Dam and its affiliated infrastructure could be the single ...
DOI:
10.1016/j.enpol.2011.06.035

4. Converging stepped spillways: Simplified momentum analysis approach

Author:
Sherry L. Hunt; Darrel M. Temple; Steven R. Abt; Kem C. Kadavy; Greg Hanson
Source:
Journal of Hydraulic Engineering 2012 v.138 no.9 pp. 796-802
ISSN:
0733-9429
Subject:
concrete; dams (hydrology); engineers; models; momentum; prediction; topography; watersheds
Abstract:
... Roller compacted concrete (RCC) stepped spillways are growing in popularity for providing overtopping protection for aging watershed dams with inadequate auxiliary spillway capacity and for the construction of new dams. Site conditions, such as limited right-of-way, topography, and geological formations, often dictate that these spillways converge. Convergence increases the flow depth near the tra ...
Handle:
10113/58298
DOI:
10.1061(ASCE)HY.1943-7900.0000584

5. Coupled and uncoupled seepage-stress analysis of roller compacted concrete dams

Author:
Parveen Khanzaei; Bijan Samali; Chunwei Zhang
Source:
ISH journal of hydraulic engineering 2017 v.23 no.1 pp. 92-101
ISSN:
2164-3040
Subject:
concrete; dams (hydrology); models; seepage; Malaysia
Abstract:
... The seepage problem of roller compacted concrete (RCC) dams is more complex because of involving compaction in its construction process in a series of layers. After completion of reservoir storage, the distribution of dam seepage field will affect that of the stress field. At the same time, the change in the dam stress field will react on the dam’s pores and cracks, reflecting the significance of ...
DOI:
10.1080/09715010.2016.1241723

6. Evaluation Method for Cohesive Crack Propagation in Fragile Locations of RCC Dam Using XFEM

Author:
Erfeng Zhao; Bo Li
Source:
Water 2020 v.13 no.1 pp. -
ISSN:
2073-4441
Subject:
concrete; dams (hydrology); deformation; equations; finite element analysis; geometry; water
Abstract:
... Roller compacted concrete (RCC) dams own a large number of horizontal construction layers, which can easily lead to weak joints among layers and generate interlayer joints with different scales to reduce the dam bearing capacity. In this study, extended finite element method (XFEM) is used to simulate crack propagation, the finite element description is first taken on the strong discontinuity. Sub ...
DOI:
10.3390/w13010058

7. Guidelines for the safety assessment of concrete dams

Author:
P. Obernhuber
Source:
Österreichische Wasser- und Abfallwirtschaft 2018 v.70 no.7-8 pp. 388-396
ISSN:
0945-358X
Subject:
concrete; dams (hydrology); experts; guidelines; risk; safety factor; terminology; tourism; Austria
Abstract:
... Dams are with respect to the engineering building standards particular structures which require specific regulations for safety verification. In Austria, guidelines for the assessment of the structural safety of concrete dams have been established by the Austrian Commission on Dams, which is a group of renowned experts advising the Ministry for Stainability and Tourism. The guidelines apply for da ...
DOI:
10.1007/s00506-018-0491-7

8. Health diagnosis of concrete dams using hybrid FWA with RBF-based surrogate model

Author:
Si-qi Dou; Jun-jie Li; Fei Kang
Source:
Water Science and Engineering 2019 v.12 no.3 pp. 188-195
ISSN:
1674-2370
Subject:
algorithms; concrete; dams (hydrology); finite element analysis; health status; hydrologic models; modulus of elasticity; monitoring
Abstract:
... Structural health monitoring is important to ensuring the health and safety of dams. An inverse analysis method based on a novel hybrid fireworks algorithm (FWA) and the radial basis function (RBF) model is proposed to diagnose the health condition of concrete dams. The damage of concrete dams is diagnosed by identifying the elastic modulus of materials using the displacement changes at different ...
DOI:
10.1016/j.wse.2019.09.002

9. How Does the Japanese Water Shrew Chimarrogale platycephalus Cross the Concrete Walls of Check Dams?

Author:
Hiroaki Saito; Hiroshi Hashimoto; Teruaki Hino; Masaharu Motokawa
Source:
Mammal study 2019 v.44 no.1 pp. 1-11
ISSN:
1348-6160
Subject:
concrete; dams (hydrology); rivers; sediments; shrews; streams; surveys; Japan
Abstract:
... The concrete walls of check dams are considered a physical barrier for aquatic and semiaquatic animals that inhabit mountain streams. Traveling behaviors around concrete check dams by the Japanese water shrew Chimarrogale platycephalus, a semi-aquatic mammal, were directly observed via radio-tracking in Kamikoshi Stream in central Honshu, Japan. Traveling behaviors were mainly observed on the wet ...
DOI:
10.3106/ms2017-0056

10. Importance of using roller compacted concrete in techno-economic investigation and design of small dams

Author:
Bouchrit Rouissat; N. Smail; S. Zenagui
Source:
Applied water science 2017 v.7 no.8 pp. 4777-4784
ISSN:
2190-5487
Subject:
concrete; dams (hydrology); deformation; drought; mathematical models; mechanical properties; spillways; surface water; water resources; Algeria
Abstract:
... In recent years, and under constraints caused by persistent drought, Algeria has launched a new mobilization strategy for surface water resources from small and medium dams. However, by making a review of the studies and achievements of twenty small dams in the west of Algeria, some deficiencies appeared. In addition to reservoir siltation assessment, operation spillways have been the major constr ...
DOI:
10.1007/s13201-017-0597-2

11. Large-scale stepped spillway testing

Author:
Sherry L Hunt; Kem C Kadavy
Source:
Dam Safety 2010. Proceedings of the Association of State Dam Safety Officials Annual Conference 2010 pp. -
Subject:
Agricultural Research Service; agricultural land; concrete; dams (hydrology); demographic statistics; energy; infrastructure; models; Oklahoma
Abstract:
... Hazard classifications for many earthen embankment dams have changed due to shifting demographics surrounding the structures. Originally designed to protect agricultural land, these embankments are now surrounded by residential communities and other infrastructure. To meet federal and state dam safety regulations as set by the new hazard classification, dam rehabilitation is often required. The US ...
Handle:
10113/620848

12. May a Standard VOF Numerical Simulation Adequately Complete Spillway Laboratory Measurements in an Operational Context? The Case of Sa Stria Dam

Author:
Maria Grazia Badas; Riccardo Rossi; Michela Garau
Source:
Water 2020 v.12 no.6 pp. -
ISSN:
2073-4441
Subject:
concrete; dams (hydrology); design; energy; information; laboratories; mathematical models; pressure; spillways; water; Italy; Sardinia
Abstract:
... The present work aims to assess whether a standard numerical simulation (RANS-VOF model with k - ϵ closure) can adequately model experimental measurements obtained in a dam physical model. The investigation is carried out on the Sa Stria Dam, a roller compacted concrete gravity dam currently under construction in Southern Sardinia (Italy). The original project, for which a physical model was simul ...
DOI:
10.3390/w12061606

13. Modeling the spatial variability of the shear strength of discontinuities of rock masses: Application to a dam rock mass

Author:
Djibril Sow; Claudio Carvajal; Pierre Breul; Laurent Peyras; Patrice Rivard; Claude Bacconnet; Gérard Ballivy
Source:
Engineering geology 2017 v.220 pp. 133-143
ISSN:
0013-7952
Subject:
case studies; concrete; dams (hydrology); geology; models; probability; protocols; shear strength; variance
Abstract:
... The shear strength of discontinuities plays a key role in the stability of rock masses, particularly in the case of analyzing the sliding stability of the rock foundations of gravity dams. This paper proposes a methodology for analyzing the spatial variability of shear strength along the joints of rock mass, based on the input parameters of the Barton and Choubey's model. The aim of this approach ...
DOI:
10.1016/j.enggeo.2017.01.023

14. Natural tracing for concentrated leakage detection in a rockfill dam

Author:
Tao Wang; Jiansheng Chen; Ping Li; Yajuan Yin; Chengji Shen
Source:
Engineering geology 2019 v.249 pp. 1-12
ISSN:
0013-7952
Subject:
chemistry; concrete; dams (hydrology); logging; stable isotopes; temperature; tracer techniques; China
Abstract:
... During two field visits to the Renzonghai dam at the southeast edge of the Qinghai-Tibet Plateau in China, a large amount of leaking water was observed downstream of the dam. In particular, at the high reservoir water level, the leakage amount reached 754.33 L/s, >10 times the maximum allowable leakage limit, which seriously threatens the dam safety. Therefore, it is essential to identify the leak ...
DOI:
10.1016/j.enggeo.2018.12.018

15. Numerical analysis of the causes of face slab cracks in Gongboxia rockfill dam

Author:
Zijian Wang; Sihong Liu; Luis Vallejo; Liujiang Wang
Source:
Engineering geology 2014 v.181 pp. 224-232
ISSN:
0013-7952
Subject:
concrete; cracking; dams (hydrology); geology; mechanical stress; slabs; stream channels; summer; temperature; winter; China; Yellow River
Abstract:
... There are face slab cracks on the Gongboxia concrete face rockfill dam (CFRD), which is located on the Yellow River in China. They generally occur as vertical cracks at the top of the panel near the water level. The region where Gongboxia CFRD is located is subjected to low temperatures during the winter months and high temperatures during the summer months. Also, this region experiences large tem ...
DOI:
10.1016/j.enggeo.2014.07.019

16. Numerical modeling of spillway aerators in high-head dams

Author:
M. Cihan Aydin; Ercan Isik; A. Emre Ulu
Source:
Applied water science 2020 v.10 no.1 pp. 42
ISSN:
2190-5487
Subject:
aeration; aerators; air; concrete; dams (hydrology); dynamic models; fluid mechanics; mathematical models; prototypes; spillways
Abstract:
... Due to high flow velocity, the spillway surfaces of high-head dams can expose to cavitational damage. The most effective and economical method of protection from this damage is aerated to flow using aerators. In this study, a spillway aerator of the roller-compacted concrete dam of 100 m height was analyzed using two-phase computational fluid dynamic model to overcome the cavitation damage on the ...
DOI:
10.1007/s13201-019-1126-2

17. Overcoming the concrete conquest of aquatic ecosystems

Author:
Steven J. Cooke; Jordanna N. Bergman; Elizabeth A. Nyboer; Andrea J. Reid; Austin J. Gallagher; Neil Hammerschlag; Keith Van de Riet; Jesse C. Vermaire
Source:
Biological conservation 2020 v.247 pp. 108589
ISSN:
0006-3207
Subject:
Anthropocene epoch; aquatic ecosystems; aquatic environment; biodiversity; biogeochemistry; concrete; construction materials; culverts; dams (hydrology); dust; erosion control; fish; fish ladders; flood control; freshwater; human development; infrastructure; management systems; natural resources conservation; permeability; pollutants; rivers; shorelines; stormwater management; streams; transportation; water power
Abstract:
... In reflecting on the human domination of our planet in the Anthropocene, some have argued that concrete is among the most destructive materials created by humans. Here we explore this idea, specifically in the context of what we consider “the concrete conquest of aquatic ecosystems.” The ubiquitous use of concrete in transportation and building infrastructure has contributed to alterations in fres ...
DOI:
10.1016/j.biocon.2020.108589

18. Regional Economic Impacts from Timber Check Dam Construction—A Comparison with Concrete Check Dam Construction

Author:
Tomohumi Huzita; Ryu Noda; Chihiro Kayo
Source:
Forests 2020 v.11 no.10 pp. -
ISSN:
1999-4907
Subject:
business enterprises; concrete; dams (hydrology); disaster preparedness; disasters; economic impact; flood control; harvesting; income; input output analysis; interviews; lumber; prices; rain; runoff; sediments; typhoons; Japan
Abstract:
... Recently, many mountain disasters caused by natural phenomena, such as typhoons and heavy rains, have struck Japan, where check dams are used as important disaster prevention structures. Meanwhile, increased timber use in Japan is expected to revitalize regional economies, thus drawing attention to the use of timber in check dams. However, comparisons between timber and concrete check dams, in ter ...
DOI:
10.3390/f11101073

19. Soft computing based formulations for slump, compressive strength, and elastic modulus of bentonite plastic concrete

Author:
Amir Tavana Amlashi; Seyed Mohammad Abdollahi; Saeed Goodarzi; Ali Reza Ghanizadeh
Source:
Journal of cleaner production 2019 v.230 pp. 1197-1216
ISSN:
0959-6526
Subject:
adsorption; algorithms; bentonite; cement; compression strength; concrete; dams (hydrology); heavy metals; mixing; modulus of elasticity; neural networks; prediction; sand; seepage; silty clay soils; water content
Abstract:
... Utilizing bentonite in composites such as concrete mixture is one of the practical approaches for adsorption of heavy metals. The mixture of bentonite and normal concrete is known as bentonite plastic concrete (BPC). This type of concrete is commonly utilized as the material of cutoff walls under earth dams with the aim of minimizing or preventing water seepage. Plastic concrete should possess hig ...
DOI:
10.1016/j.jclepro.2019.05.168

20. Stability analysis of abutment slopes based on long-term monitoring and numerical simulation

Author:
Yang Yu; Enzhi Wang; Jianwen Zhong; Xiaoli Liu; Penghui Li; Mei Shi; Zhiguo Zhang
Source:
Engineering geology 2014 v.183 pp. 159-169
ISSN:
0013-7952
Subject:
concrete; cost effectiveness; dams (hydrology); deformation; geology; mathematical models; monitoring; wells
Abstract:
... The Shimenzi Roller-Compacted Concrete (RCC) arch dam is built in a soft rock region where faults and intercalations have developed. The abutments are divided by major faults and intercalations into several potential sliding wedges, which bring difficulties and threats to the construction of the dam and the operation of the reservoir. Several types of large-scale reinforced concrete structures, su ...
DOI:
10.1016/j.enggeo.2014.10.010