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

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.

scholarly journals Screening of Lettuce Germplasm for Agronomic Traits under Low Water Conditions

HortScience ◽  
2016 ◽  
Vol 51 (6) ◽  
pp. 669-679 ◽  
Author(s):  
Renée L. Eriksen ◽  
Caleb Knepper ◽  
Michael D. Cahn ◽  
Beiquan Mou
Keyword(s):  
Drought Stress ◽  
Agronomic Traits ◽  
High Water ◽  
Severe Drought ◽  
Lactuca Serriola ◽  
Cultivar Selection ◽  
Significant Difference ◽  
Water Conditions ◽  
Leaf Lettuce ◽  
Water Treatments

After a preliminary screening of over 3500 cultivars, we selected 200 butterhead, cos, crisphead, leaf, and stem lettuce (Lactuca sativa L.) and wild prickly lettuce (Lactuca serriola L.) varieties to test under high water (150% evapotranspiration [ET]) and low water (50% ET) conditions in the field, and tracked commercially relevant traits related to growth and marketability, maturity, and physiology. Plants typically reduced growth and appeared to reallocate developmental resources to achieve maturity quickly, as indicated by traits such as increased core length. This strategy may allow them to complete their life cycle before severe drought stress proves lethal. Although most cultivars experienced a reduction in growth under low water conditions relative to high water conditions, some cultivars had a significantly reduced yield penalty under stress conditions. Among the different types of lettuce, the fresh weight (FW) of cos cultivars was most affected by drought stress, and the FW of leaf lettuce was least affected. Cos cultivars tended to bolt early. Crisphead cultivars Cal-West 80, Heatmaster, and Marion produced large heads and did not bolt under low water treatments, and butterhead cultivars Buttercrunch and Bibb also produced relatively large heads with very little bolting and no signs of tipburn. The four green leaf cultivars Slobolt, Grand Rapids, Western Green, and Australian showed no statistically significant difference in FW among high and low water treatments in multiple trials, and may be good choices for growers who wish to minimize losses under reduced irrigation. The identification of potentially drought-tolerant varieties and the information from this study may be helpful for cultivar selection by growers under drought conditions, but this study also serves as a step forward in the genetic improvement of lettuce to drought stress.

scholarly journals Sistem Pendeteksi Dini Bencana Banjir Menggunakan Teknik DTMF (Dual Tone Multiple Frequency)

Respati ◽  
2019 ◽  
Vol 14 (2) ◽  
Author(s):  
Andika Agus Slameto ◽  
Eko Pramono ◽  
Zainal Arifin
Keyword(s):  
Decision Making ◽  
High Water ◽  
Water Levels ◽  
Decision Making Process ◽  
Radio Waves ◽  
Multiple Frequency ◽  
Existing Problems ◽  
Water Conditions ◽  
Flood Detection ◽  
Human Side

INTISARIBanjir adalah bencana alam yang sulit di deteksi kapan akan datang terutama di musim hujan. Meskipun sudah dilakukan upaya dengan melakukan analisis terhadap data curah hujan serta tinggi permukaan air setiap periodenya, namun upaya tersebut dirasa masih belum dapat menyelesaikan permasalahan yang ada. Selain dari sisi manusia nya sendiri, solusi dari sisi teknologi juga diharapkan dapat penyelesaian permasalahan ini. Teknologi untuk deteksi dini bencana banjir akan dibutuhkan sebagai alternatif untuk membantu menyelesaikan permasalahan serta membantu dalam proses pengambilan keputusan guna meningkatkan kinerja instansi yang bekerja untuk memantau volume air sungai sehingga memperoleh kondisi air yang lebih cepat dan akurat. Tinggi permukaan air tentu menjadi salah satu faktor yang menyebabkan potensi banjir dimana permukaan air dapat diukur. DTMF merupakan metode pensinyalan yang nantinya akan dipadukan dengan sensor yang dapat digunakan untuk mengukur ketinggian permukaan air yang hasilnya nanti akan dikirim melalui gelombang radio. Dengan pengiriman sinyal melalui gelombang radio ini maka akan lebih efektif karena tidak memerlukan biaya seperti halnya melalui sms dan IoT.Kata kunci— DTMF, Arduino, Pendeteksi Banjir, SWOT, Gelombang Radio ABSTRACTFloods are natural disasters that are difficult in the detection of when it will come mainly in the rainy season. Despite efforts by conducting an analysis of the data of rainfall and high water levels at each, but those efforts proved still unable to resolve the existing problems. Aside from the human side of his own, the solution from the tech side is also expected to be the resolution of this issue. Technology for early detection of catastrophic flooding will be required as an alternative to help solve problems as well as help in the decision-making process in order to improve the performance of agencies who work to monitor the volume of river water so obtain water conditions more quickly and accurately. High water levels would certainly be one of the factors that lead to potential flooding where water levels can be measured. DTMF signalling is a method which will be combined with sensors that can be used to measure the height of the surface of the water which results will be sent via radio waves. With the delivery of the signal via radio waves it then it will be more effective because it doesn't cost as much as through sms and IoT.Keyword — DTMF, Arduino, Flood Detection, SWOT, Radio Wave

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