Bathymetric changes, roughness and conveyance of a compound, regulated by groynes river channel during low and high water conditions

2014 ◽  
pp. 369-374
Author(s):  
R Banasiak ◽  
M Krzyżanowski ◽  
J Gierczak ◽  
M Wdowikowski
Keyword(s):  
High Water ◽  
River Channel ◽  
Water Conditions ◽  
Bathymetric Changes

Performance of Light Coastal Structures Under Normal and High Water Conditions

1975 ◽  
Vol 2 (4) ◽  
pp. 381-391 ◽  
Author(s):  
J. W. Kamphuis
Keyword(s):  
Lake Erie ◽  
High Water ◽  
Water Levels ◽  
Coastal Protection ◽  
Coastal Structures ◽  
Water Conditions ◽  
Protection Structures

A number of lightweight coastal protection structures, built on the Lake Erie shore are discussed in this paper. There were two constraints on the design; limited funds and a very precarious downdrift beach. Thus the structures were inexpensive and the protection was low-key to prevent damage downdrift. In 1972–1974 these structures were subjected to a combination of large waves and high water levels and thus they were tested well beyond their design limits.The paper discusses the structures, their performance under normal conditions, and their performance during and after the abnormally high water levels. It is found that inexpensive, low-key structures are sufficiently strong to survive normal conditions, but fail by overtopping and flanking under conditions beyond their low design limits.

Soil behavior and related effects in the Peru earthquake of May 31, 1970

1971 ◽  
Vol 61 (3) ◽  
pp. 579-590 ◽  
Author(s):  
William Enkeboll
Keyword(s):  
Water Table ◽  
High Water ◽  
Soil Behavior ◽  
High Water Table ◽  
Water Conditions ◽  
Degree Of Damage ◽  
Soil And Water

abstract Soil and water conditions had an effect on the degree of damage to structures. Most structures were located on alluvium with a high water table. Settlements occurred in dike and causeway fill in Chimbote harbor. Severe problems to communication occurred in some areas through embankment failures and road slides.

Monitoring High-Water Conditions Using Nighttime Thermal Imagery

2002 ◽  
Vol 39 (3) ◽  
pp. 170-180 ◽  
Author(s):  
Ye. V. Shcherbenko ◽  
S. G. Doroshenko
Keyword(s):  
High Water ◽  
Thermal Imagery ◽  
Water Conditions

scholarly journals DANGER OF RIVERBED PROCESSES ON RUSSIAN RIVERS: ASSESSMENT CRITERIA, MAPPING, REGIONAL ANALYSIS

2021 ◽  
pp. 53-67
Author(s):  
Roman S. Chalov ◽  
◽  
Alexey V. Chernov ◽  
Nadezhda M. Mikhailova ◽  
◽  
...  
Keyword(s):  
Main Part ◽  
Regional Analysis ◽  
High Water ◽  
River Channel ◽  
Assessment Criteria ◽  
Natural Conditions ◽  
Channel Processes ◽  
Geographical Analysis ◽  
Full View

The article discusses the danger that channel processes – the processes creating the river channel and floodplain and those occurring in them – can pose to people. Riverbed processes are among the most dynamic ones in nature: the speed of their manifestation varies from the first decades to individual months in high water and floods, i.e. they develop in full view of people. This can significantly complicate life on the banks of rivers and the use of river resources. The article deals with dangerous manifestations of riverbed processes, their causes and consequences, but the main part of the paper is devoted to the cartographic method of assessing the danger of riverbed processes: determining the danger degree and various ways of displaying it on maps. There are given examples of showing danger on previously compiled maps. In conclusion, the article provides a brief geographical analysis of the distribution of various types and the manifestation degree of dangerous riverbed processes in a variety of natural conditions in Russia.

Shear Distribution Coefficient Study of New Inland Large-Head Wharf Structure under Horizontal Force

2013 ◽  
Vol 639-640 ◽  
pp. 177-182
Author(s):  
Kai Ming Zou ◽  
Xiao Ping Liu
Keyword(s):  
Distribution Coefficient ◽  
Design Method ◽  
High Water ◽  
Analysis Method ◽  
Nonlinear Structure ◽  
Shear Distribution ◽  
Traditional Design ◽  
Large Head ◽  
Water Conditions ◽  
The Moment

Load distribution machannism between bents of piled wharf is an important issue.In view of the shortage of the traditional design method for piled wharf structure,this paper established the nonlinear structure-soil numerical model by finite element method software ANSYS.Based on the numerical analysis method, shear distribution coefficient of three different structure themes under high water conditions and low water conditions were Analyzed.Through post-processing process,information about the moment,shear stess of piles were obtained.The results showed that the integrity and capacity of resting horizontal load is increased by setting of longitudinal beams,.and the lower the collision position is,the more concentrate the distribution is..The conclusion and research method of this paper can be used as a reference for similar project in future.

scholarly journals Population Characteristics of Shovelnose Sturgeon During Low‐ and High‐Water Conditions in the Lower Platte River, Nebraska

2018 ◽  
Vol 38 (2) ◽  
pp. 308-315
Author(s):  
Jeremy J. Hammen ◽  
Martin J. Hamel ◽  
Matthew L. Rugg ◽  
Edward J. Peters ◽  
Mark A. Pegg
Keyword(s):  
High Water ◽  
Population Characteristics ◽  
Platte River ◽  
Shovelnose Sturgeon ◽  
Water Conditions

Vertical distribution profiles and temporal growth patterns of roots in selected oilseeds, pulses and spring wheat

2011 ◽  
Vol 62 (6) ◽  
pp. 457 ◽  
Author(s):  
Yantai Gan ◽  
Liping Liu ◽  
Herb Cutforth ◽  
Xiaoyu Wang ◽  
Greg Ford
Keyword(s):  
Vertical Distribution ◽  
Spring Wheat ◽  
Soil Profile ◽  
Nutrient Use Efficiency ◽  
Soil Layer ◽  
High Water ◽  
Growth Patterns ◽  
System Level ◽  
Root Volume ◽  
Water Conditions

Knowledge of rooting systems and their vertical distribution in the soil profile for field crops is required for designing crop rotation systems that allow for effective use of soil water and nutrients. This study determined the vertical distribution in the upper 100 cm of the soil profile and the temporal growth patterns of roots for three pulses (Cicer arietinum L. chickpea, Pisum sativum L. dry pea, and Lens culinaris Medik. lentil) and three oilseeds (napus canola, juncea mustard, and Linum usitatissimum flax) and spring wheat (Triticum aestivum L.). Crops were grown in 150-mm-diameter, 1-m-long lysimeters under low- (rainfall only) and high- (rainfall + irrigation) water availabilities in a 2-year (2006–07) field study, in Swift Current, Canada. Root volumes increased significantly from the seedling stage, reached the maximum at the late-flowering, and declined to maturity; this temporal growth pattern was independent with water availability. On average, ~44% of the root volume was in the top 20-cm soil layer, 70% in the top 40 cm, and 90% in the top 60 cm. About 5% of the roots in pulse crops were located below 60 cm in depth, significantly less than the 12% for wheat, 13% for mustard, and 18% for canola. Under low-water conditions, Brassica oilseeds had greater root volume (33 mm3 cm–3) than wheat (27 mm3 cm–3), but under high-water conditions, root volumes were 27 mm3 cm–3 for the Brassicas and 32 mm3 cm–3 for wheat. Pulses had greatest root volumes under both low- (40 mm3 cm–3) and high- (42 mm3 cm–3) water conditions, with largest root diameters among crops evaluated, whereas flax the smallest. Rotating the shallower but larger diameter, thicker-rooting pulses with deeper but smaller diameter, thinner-rooting oilseeds or wheat may increase water- and nutrient-use efficiency at the system level.

Habitat preference and reproductive traits of a major Australian riparian tree species (Casuarina cunninghamiana)

2001 ◽  
Vol 49 (6) ◽  
pp. 705 ◽  
Author(s):  
A. R. Woolfrey ◽  
P. G. Ladd
Keyword(s):  
Population Structure ◽  
Water Table ◽  
Seedling Establishment ◽  
Reproductive Traits ◽  
High Water ◽  
River Channel ◽  
Sandy Substrate ◽  
Casuarina Cunninghamiana ◽  
Eastern Australia ◽  
Seed Fall

The population structure and reproductive biology of the river oak (Casuarina cunninghamiana) were studied along the Murrumbidgee River on the Southern Tablelands of eastern Australia. The species has cone-like infructescences but is not serotinous, with samaras released when they are mature. Samaras were mostly distributed by wind close to female trees but were also carried by water. The first year of study (1985) appeared to be a mast year for seed production with much lower seed fall in the following year. Seedling establishment was spatially very variable, mostly under female canopies and appeared earlier on soil within the river channel than on the bank. Turnover was high and seedlings in the river channel generally died after being inundated. Most trees were within 3 m of the mean river level. However, the total distribution of adults was within the envelope of maximum floods in the area but establishment was not dependent on floods. The population structure was the result of yearly recruitment, although episodic events (floods, drought) may enhance or decrease establishment. Pot-trial results paralleled the field situation with substrate and water-table level not affecting germination of seed but strongly influencing seedling growth. Plants grew best on cobble substrates under a low water-table regime and poorly on cobbles with high water and sandy substrate under all water-table levels. Cobble banks seemed the best substrate for growth within the river channel and establishment may be prolific. Less-abundant seedling establishment occurred upslope but controls over this were not investigated.

scholarly journals Remarks on the Boundary Conditions for a Serre-Type Model Extended to Intermediate-Waters

Modelling ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 626-640
Author(s):  
José Simão Antunes Do Carmo
Keyword(s):  
Shallow Water ◽  
Nonlinear Models ◽  
Numerical Models ◽  
Wave Theory ◽  
Coastal Protection ◽  
Type Model ◽  
Water Conditions ◽  
Potential Risks ◽  
Bathymetric Changes ◽  
Limited Depth

Numerical models are useful tools for studying complex wave–wave and wave–current interactions in coastal areas. They are also very useful for assessing the potential risks of flooding, hydrodynamic actions on coastal protection structures, bathymetric changes along the coast, and scour phenomena on structures’ foundations. In the coastal zone, there are shallow-water conditions where several nonlinear processes occur. These processes change the flow patterns and interact with the moving bottom. Only fully nonlinear models with the addition of dispersive terms have the potential to reproduce all phenomena with sufficient accuracy. The Boussinesq and Serre models have such characteristics. However, both standard versions of these models are weakly dispersive, being restricted to shallow-water conditions. The need to extend them to deeper waters has given rise to several works that, essentially, add more or fewer terms of dispersive origin. This approach is followed here, giving rise to a set of extended Serre equations up to kh ≈ π. Based on the wavemaker theory, it is also shown that for kh > π/10, the input boundary condition obtained for shallow-waters within the Airy wave theory for 2D waves is not valid. A better estimate for the input wave that satisfies a desired value of kh can be obtained considering a geometrical modification of the conventional shape of the classic piston wavemaker by a limited depth θh, with θ≤ 1.0.

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