scholarly journals RESEARCH ON WAVE ACTION ON LAKE SHORES AND UNLINED SLOPES OF ARTIFICIAL EARTH STRUCTURES

2011 ◽  
Vol 1 (7) ◽  
pp. 15
Author(s):  
A.A. Pichoughkin
Keyword(s):  
Surface Area ◽  
Water Surface ◽  
Wave Action ◽  
Kuibyshev Reservoir ◽  
Earth Structures ◽  
Artificial Earth ◽  
The Waves

The construction of big modern hydro-electric plants makes it necessary to create large reservoirs, of which the surface area can be on the order of some hundreds or even thousands square kilometers. As for example, the surface area of the Kuibyshev reservoir is 5600 km 2 that one of the Sherbakov reservoir - 4500 km^, of the Stalingrad reservoir - 3470 km2, of Kahovka reservoir - 2155 km2. The dimensions of reservoirs in plan being so considerable, the waves of 3-3,5m height can appear on the water surface. The shoreline of reservoirs created on U.S.S.R. plain rivers exceeds the length of 13000 km. The problem of the protection of the upstream slopes of artificial earth structures and natural shores against wave action is of extreme importance under these conditions.

Sabellaria Colonies at Duckpool, North Cornwall, 1971–1972, With a Note for May 1973

1974 ◽  
Vol 54 (2) ◽  
pp. 393-436 ◽  
Author(s):  
Douglas P. Wilson
Keyword(s):  
Surface Area ◽  
Close Packing ◽  
Wave Action ◽  
Physical Damage ◽  
Fast Growing ◽  
New Knowledge ◽  
Rapid Elongation ◽  
Delayed Growth

The exceptionally heavy settlement of larvae in the autumn of 1970 made it imperative to continue the observations of the previous ten years. This two-year extension has yielded much new knowledge about the growth of Sabellaria colonies at Duckpool, and about other aspects of their life. It revealed that the more densely packed the young were the faster their colony grew, provided conditions were favourable. In unfavourable circumstances close packing of young delayed growth. The rapid elongation of young tubes surrounding older tubes sometimes resulted in holes and fissures forming when the older worms failed to maintain all-round contact with surrounding young as the surface area of a colony increased. Such holes and fissures gave a false appearance of physical damage, and in colonies where they formed weakened the whole structure, becoming a factor in its ultimate destruction by wave action. Such fast-growing colonies have shorter lives than others growing more slowly and remaining more compact.

scholarly journals WAVE ACTION ON LARGE OFF-SHORE STRUCTURES

1976 ◽  
Vol 1 (15) ◽  
pp. 129 ◽  
Author(s):  
C.J. Apelt ◽  
A. Macknight
Keyword(s):  
Numerical Methods ◽  
Water Surface ◽  
Theoretical Method ◽  
Wave Force ◽  
Wave Action ◽  
Tidal Range ◽  
Scale Model ◽  
Wave Forces ◽  
Accurate Calculation ◽  
Scour Protection

The paper describes investigations carried out in order to design for the wave action, both wave force and scour, on large off-shore berthing structures sited approximately 1.3 miles (2.1 km) off-shore near Hay Point, North Queensland, in 56 feet (17 m) of water at low tide, the tidal range being 20 feet (6 m). The region is a cyclone area and the structures must be capable of withstanding attack from maximum predicted waves with period of 8.25 seconds and amplitude of 24 feet (7.3 m). The main units in the berthing structures are concrete caissons sunk on to the ocean bed and the largest of these have plan dimensions of approximately 150 feet (46.7 m) by 135 feet (41.4 m) with four columns approximately 40 feet (12.2 m) square projecting through the water surface. No theoretical method available at the time of the investigation was capable of accurate calculation of wave forces on these structures. A scale model was tested to obtain wave forces and the paper compares results from the model with those of numerical methods and discusses the application of the results to the design functions. Scour effects were also modelled and the results used as the basis for design of scour protection.

scholarly journals Impacts of Rapid Changes of Land Cover and Intensive Human Activities on Avarga Toson Lake Area, Mongolia

2020 ◽  
Vol 12 (15) ◽  
pp. 6070
Author(s):  
Urtnasan Mandakh ◽  
Danzanchadav Ganbat ◽  
Bayartungalag Batsaikhan ◽  
Sainbayar Dalantai ◽  
Zolzaya Adiya ◽  
...  
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Surface Area ◽  
Human Activities ◽  
Water Surface ◽  
Land Development ◽  
Water Area ◽  
Lake Area ◽  
Surrounding Area ◽  
Water Surface Area

Avarga Toson Lake and its surrounding area are very important for people, wildlife, and animals in Delgerkhaan Soum of Khentii Province in Eastern Mongolia. Some research has been conducted so as to explore the medical nature and characteristics of the lake and its surrounding area. However, the adverse effects of land use have neither been studied nor reported. The fact that the water catchment area is shrinking evidences clearly that findings of various real-time studies must be used effectively in the long-term by the local government and relevant authorities in order to take immediate remedial measures. Our study focused on land cover changes occurring as a result of human activities in the area, using a Landsat imageries and water indices approach to estimate the changes of land use and land cover. The aims of this study were to assess the land use and cover change that occurred between 1989 and 2018 and to define the impacting factors on the changes of water surface area in Avarga Toson Lake area, Mongolia. Findings revealed that the water surface area has decreased by 34.1% in the past 30 years. The lake water area had the weakest, positive correlation with temperature and precipitation. We did not find any indicators suggesting a relationship between lake area and climate variables. In contrast, the area was slightly correlated with socio-economic variables, such as Toson Lake area with the number of visitors (R2 = 0.89) and Burd Lake area the with number of livestocks (R2 = 0.75), respectively. Therefore, the main conclusion of this paper is that socioeconomic factors driven by land use change, policy, and institutional failure together with the existing pressure on the lake may amplify their effect of the water surface area decreasing. Additionally, even if policy adoption is relatively sufficient in the country, the public institutional capacity to implement a successful sustainable land management model regarding land access, land development, land resources protection, land market, and investments in infrastructure remains very limited.

scholarly journals Non-Hydrostatic Modeling of Waves Generated by Landslides with Different Mobility

2019 ◽  
Vol 7 (8) ◽  
pp. 266 ◽  
Author(s):  
Ryan P. Mulligan ◽  
W. Andy Take ◽  
Gemma K. Bullard
Keyword(s):  
Momentum Flux ◽  
Water Surface ◽  
Laboratory Experiments ◽  
Close Agreement ◽  
Short Communication ◽  
High Mobility ◽  
Numerical Predictions ◽  
New Research ◽  
The Waves ◽  
Transfer Momentum

Tsunamis are generated when landslides transfer momentum to water, and these waves are major hazards in the mountainous coastal areas of lakes, reservoir, and fjords. In this study, the influence of slide mobility on wave generation is investigated using new: (i) experimental observations; (ii) theoretical relationships; and (iii) non-hydrostatic numerical predictions of the water surface and flow velocity evolution. This is accomplished by comparing landslides with low and high mobility and computing the momentum flux from landslides to water based on data collected in laboratory experiments. These slides have different materials, different impact velocities, different submarine runout distances, and generate very different waves. The waves evolve differently along the length of the waves’ flume, and the experimental results are in close agreement with high-resolution phase-resolving simulations. In this short communication, we describe new research on landslide generated waves conducted at Queen’s University, Canada, and presented at Coastlab18 in Santander, Spain.

Sign in / Sign up

Export Citation Format

Share Document