Application of Ecological Vegetation for a Shipping Hub

2014 ◽  
Vol 488-489 ◽  
pp. 322-328
Author(s):  
Chun Xin Zhong ◽  
Shi Yao Xiao ◽  
Jin Long Liu ◽  
Wei Zhang
Keyword(s):  
Hydrodynamic Characteristic ◽  
Water Levels ◽  
Hydrodynamic Characteristics ◽  
Protection Zone ◽  
Protection Area ◽  
Landscape Zone ◽  
Vegetation Selection

Hydrodynamic characteristic is an important reference to select vegetation material of ecological revetment engineering. In this paper, embankment will be divided into bottom-protection zone, key-protection zone, hydrophilic zone, landscape zone according to hydrodynamic characteristics of different water levels. Vegetations adapting to different protection area analyzed and discussed. With the example of ecological revetment in Naji reservoir in Guangxi, China, vegetation selection on different protection zone is demonstrated.

scholarly journals Construction and performance analysis of data warehouse based on ship propulsion system

2021 ◽  
Vol 248 ◽  
pp. 01060
Author(s):  
Qi Hu ◽  
Yutao Chen ◽  
Yuqian He
Keyword(s):  
Data Warehouse ◽  
Visual Analysis ◽  
Hydrodynamic Characteristic ◽  
Propulsion System ◽  
Multidimensional Analysis ◽  
Hydrodynamic Characteristics ◽  
Soft Sensing ◽  
Ship Propulsion ◽  
System Data ◽  
And Performance

A large number of operation data will be generated in the process of ship propulsion system operation. Aiming at the processing, analysis and application of these operation data, a data warehouse for propulsion system is constructed based on the operation data of a ship, and the multidimensional analysis and result display of data are realized by combining OLAP technology with visual analysis software tableau. On the basis of the data warehouse, the soft sensing of parameters is applied to the data warehouse. Based on the soft sensing data, the hydrodynamic characteristics of the propeller are studied, and the hydrodynamic characteristic curves of the propeller are obtained. The research of ship propulsion system based on data warehouse provides support for the comprehensive information of propulsion system data.

scholarly journals Numerical Prediction of Wave Patterns Due to Motion of 3D Bodies by Kelvin-Havelock Sources

2016 ◽  
Vol 23 (4) ◽  
pp. 46-58 ◽  
Author(s):  
Hassan Ghassemi ◽  
Isar Ghamari ◽  
Arash Ashrafi
Keyword(s):  
Numerical Evaluation ◽  
Hydrodynamic Characteristic ◽  
Hydrodynamic Characteristics ◽  
Characteristic Analysis ◽  
Wave Patterns ◽  
Wigley Hull ◽  
Free Surface Wave ◽  
Potential Methods ◽  
Singularity Distribution ◽  
Moving Bodies

AbstractThis paper discusses the numerical evaluation of the hydrodynamic characteristics of submerged and surface piercing moving bodies. Generally, two main classes of potential methods are used for hydrodynamic characteristic analysis of steady moving bodies which are Rankine and Kelvin-Havelock singularity distribution. In this paper, the Kelvin- Havelock sources are used for simulating the moving bodies and then free surface wave patterns are obtained. Numerical evaluation of potential distribution of a Kelvin-Havelock source is completely presented and discussed. Numerical results are calculated and presented for a 2D cylinder, single source, two parallel moving source, sphere, ellipsoid and standard Wigley hull in different situation that show acceptable agreement with results of other literatures or experiments.

scholarly journals Analysis of Salt Lake Volume Dynamics Using Sentinel-1 Based SBAS Measurements: A Case Study of Lake Tuz, Turkey

2021 ◽  
Vol 13 (14) ◽  
pp. 2701
Author(s):  
Burhan Baha Bilgilioğlu ◽  
Esra Erten ◽  
Nebiye Musaoğlu
Keyword(s):  
Water Level ◽  
Salt Lake ◽  
Good Alternative ◽  
Water Levels ◽  
Wet Season ◽  
Interferometric Technique ◽  
Lake Volume ◽  
Environmental Protection Area ◽  
Protection Area ◽  
Small Baseline

As one of the largest hypersaline lakes, Lake Tuz, located in the middle of Turkey, is a key waterbird habitat and is classified as a Special Environmental Protection Area in the country. It is a dynamic lake, highly affected by evaporation due to its wide expanse and shallowness (water depth <40 cm), in addition to being externally exploited by salt companies. Monitoring the dynamics of its changes in volume, which cause ecological problems, is required to protect its saline lake functions. In this context, a spatially homogeneous distributed gauge could be critical for monitoring and rapid response; however, the number of gauge stations and their vicinity is insufficient for the entire lake. The present study focuses on assessing the feasibility of a time-series interferometric technique, namely the small baseline subset (SBAS), for monitoring volume dynamics, based on freely available Sentinel-1 data. A levelling observation was also performed to quantify the accuracy of the SBAS results. Regression analysis between water levels, which is one of the most important volume dynamics, derived by SBAS and levelling in February, April, July and October was 67%, 80%, 84%, and 95% respectively, for correlation in the range of 10–40 cm in water level, and was in line with levelling. Salt lake components such as water, vegetation, moist soil, dry soil, and salt, were also classified with Sentinel-2 multispectral images over time to understand the reliability of the SBAS measurements based on interferometric coherence over different surface types. The findings indicate that the SBAS method with Sentinel-1 is a good alternative for measuring lake volume dynamics, including the monitoring of water level and salt movement, especially for the dry season. Even though the number of coherent, measurable, samples (excluding water) decrease during the wet season, there are always sufficient coherent samples (>0.45) over the lake.

Assessment of the risk of destabilization of vehicles at crossing points between streams and roads

2020 ◽  
Author(s):  
Ricardo Andres Bocanegra Vinasco ◽  
Félix Francés
Keyword(s):  
Hazard Index ◽  
Flood Management ◽  
Damage Function ◽  
Water Levels ◽  
Hydrodynamic Characteristics ◽  
Water Currents ◽  
Traffic Characteristics ◽  
Highly Sensitive ◽  
Negative Impacts ◽  
Statistical Integral

&lt;p&gt;River floods can cause the destabilization of vehicles and vehicles can increase the negative impacts of floods when they are mobilized by the flow, causing economic and life losses. Because of this, integral flood management requires the identification and assessment of the risk to which vehicles are subjected at the crossing points between water currents and roads. In the present investigation a methodology was developed to calculate this risk based on the characteristics of vehicles, floods and traffic. The risk at each stream crossing is calculated by means of the statistical integral of the vehicle vulnerability given the actual exposition and hazard.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;Hazard corresponds to the probability that flow causes the destabilization of each type of car and is determined from the hydrodynamic characteristics of the floods and the implementation of a stability criterion for partially submerged cars, through which a hazard index is established. Hazard is obtained through the combination of the probability that the flood event occurs with the values that the hazard index would take. The vulnerability of a given type of car is determined by means of a damage function defined from the values of the hazard index. The exposure is established based on the traffic characteristics and the driver behavior.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;The methodology developed was applied in the municipality of Godelleta (Spain), finding that in approximately a quarter of the 25 intersections between streams and roads, the risk of vehicles due to flooding is relatively high, since it exceeds 0.2 vehicles per year. In approximately half of the intersections the risk is relatively low since it is less than 0.1 vehicles per year. Additionally, it was found that the risk of vehicles in stream crossings due to flooding is highly sensitive to the magnitude of the water level from which drivers decide to interrupt vehicle traffic through flooded crossing. The magnitude of the risk grows as drivers assume less conservative behavior, that is, when they decide to drive with higher water levels.&lt;/p&gt;&lt;p&gt;Key words&lt;/p&gt;&lt;p&gt;Risk of vehicles due to floods&lt;/p&gt;&lt;p&gt;Stability of cars partially submerged&lt;/p&gt;&lt;p&gt;Vulnerability of vehicles to floods&lt;/p&gt;

scholarly journals Study on the Hydrodynamic Resistance Moment of Horizontally-Framed Miter Gates

Water ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1345
Author(s):  
Jinchao Xu ◽  
Qiong Chen ◽  
Yun Li ◽  
Jianxu Zhou ◽  
Jianfeng An ◽  
...  
Keyword(s):  
Early Stage ◽  
Three Dimensional ◽  
Reference Value ◽  
Water Levels ◽  
Operating Conditions ◽  
Hydrodynamic Resistance ◽  
Initial Time ◽  
Hydrodynamic Characteristics ◽  
Operating Characteristics ◽  
Peak Value

Generally, the operation of the horizontally-framed miter gate in a ship lock should consider the effects of hydrodynamic resistance. If over-filling or over-emptying exists and the miter gate opens with reverse head, the hydrodynamic resistance will increase rapidly, endangering the operation safety of the miter gate. In order to study the operating characteristics of the miter gate, a prototype test is introduced in this paper. Results show that, during the filling or emptying process, when water levels at both sides of the miter gate are equal the first time, opening the gate in a timely manner can obviously avoid the influence of reverse head. Furthermore, a three-dimensional numerical model with a dynamic mesh is established for analyzing the hydrodynamic characteristics in different operating conditions. Results show that the peak value of operating load always occurs at the initial time, and the greater the submerged water depth, the larger the peak value. With the increasing of reverse head, the piston rods sustain a great compression, and the peak value appears at an early stage of gate opening. The results have a reference value for the design of a miter gate in the related engineering projects.

Injection Current into the Power Transformer as an Internal Fault Phenomena for Measuring the Differential Relay Performance

2020 ◽  
Vol 19 (6) ◽  
pp. 443-451
Author(s):  
Arief Goeritno ◽  
Irwan Nugraha ◽  
Syofyan Rasiman ◽  
Ayumi Johan
Keyword(s):  
Loading Condition ◽  
Current Flow ◽  
Power Transformer ◽  
Current Measurement ◽  
Inrush Current ◽  
Protection Zone ◽  
The Third ◽  
Internal Fault ◽  
Protection Area ◽  
Current Value

In this paper explains the classical aspects in measure the differential relay performance. The classical aspects use the simulation through inrush current into the power transformer under three conditions. The first condition is giving the normal phenomenon as phenomenon of loading, the second condition is giving the fault phenomenon for outside of the protection zone, and the third condition is giving the fault phenomenon for inside of the protection zone. The result of measurement during loading condition, the differential relay not operate, because relay is set with value of 130% of the largest current between the three phases, so that the adjustable current is 4.45 mA. The results of current measurement to the differential relay when the fault condition is provided outside of the protection area, the current value to the differential relay should of zero mA and the differential relay not operate. The result of measurement of the current flow to the differential relay when giving the fault phenomenon inside the protection zone is obtained flow to relay at the phase-R is 127.7 mA, phase-S is 123.9 mA, and phase-T equal to 123.8 mA, while the result of calculation of the current flow to the differential relay of each phase of 152.61 mA, and the differential relay operate. After giving all of three conditions, the differential relay performance is known.

Evaluation of Horizontal and Vertical Erosion of the Water Protection Zone of the Tsimlyansk Reservoir (a Case of Dubovsky District)

2021 ◽  
pp. 81-88
Author(s):  
Alexey E. Kosolapov ◽  
Grigory I. Skripka ◽  
Lyudmila A. Bespalova ◽  
Vadim V. Glinka ◽  
Olga V. Ivlieva ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Water Body ◽  
Field Research ◽  
Water Protection ◽  
Morphometric Characteristics ◽  
Protection Zone ◽  
Tsimlyansk Reservoir ◽  
Erosion Processes ◽  
Aerial Vehicles ◽  
Protection Area

The nature and intensity of erosion processes are an important parameter for monitoring water protection area of water body. A technique, based on field and office studies, which were carried out with the use of unmanned aerial vehicles (UAVs) (Phantom 4 Pro and Phantom 4 Advanced), was worked out and the intensity of the manifestation of erosion processes in the water protection area of the Tsimlyansk reservoir was assessed (on the example of Dubovsky district). In our research, the comparative-geographic method was used. That allowed us very accurately to identify erosional objects on the ground, and to determine their morphological and morphometric characteristics. Cameral works processed the data obtained by using UAVs. The tools of the Agisoft Metashape Professional program and the tools of the ArcGIS program were used during the work. These programs make it possible, without labor-intensive instrumental field research, to draw up orthophotoplans for gullies and determine their areas, steepness of slopes, length and width of slopes, depth of gullies, make longitudinal and transverse profiles of gullies, measure the volume of gullies and a number of other parameters. This method gives us a complete picture of the gullying network within the water protection area. In addition, a comparison of survey materials for different periods makes it possible to identify trends in the development of individual erosional forms, as well as the entire gullying network within the water protection area as a whole.

scholarly journals Research on hydrodynamic characteristics of cylinder planing

2021 ◽  
Vol 39 (1) ◽  
pp. 101-110
Author(s):  
Fuqiang Liu ◽  
Kai Luo ◽  
Hongge Liang ◽  
Chuang Huang ◽  
Shaohang Geng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Drag Coefficient ◽  
High Speed ◽  
Lift Coefficient ◽  
Hydrodynamic Characteristic ◽  
Calculation Model ◽  
Simulation Software ◽  
Hydrodynamic Characteristics ◽  
Water Splash ◽  
Flow Field Characteristics

This paper selects SST k-w turbulence model and VOF wave to construct a numerical calculation model of moving body planning on a flat free surface based on STAR-CCM+ numerical simulation software. The construction model is checked through foreign classic literature, and the numerical simulation results are in good agreement with the experimental results. The hydrodynamic numerical errors are less than 5%, which is within the engineering error range. The model can be used for the numerical simulation of the planning cylinder. In this paper, it is used to simulate the planing process of cylinder with different speeds and different submerged depths, and the flow field characteristics and hydrodynamic characteristics in the planing process are obtained. The results show that waves appear at the tail and the tail liquid splashes to form a water splash during the planing process of the cylinder on a flat surface. The higher the speed of the planning cylinder is, and the deeper the submersion depth, the more pronounced waves at the tail. When the cylinder has a Fr number Cv≥8, the hydrodynamic force of the cylinder is almost unchanged, and it is not affected by the speed. But when Cv=3, the hydrodynamic characteristic coefficient is higher. The drag coefficient is 20% higher than that in the high-speed (Cv≥8) planing process. The lift coefficient is 3 times of high-speed planing lift coefficient. It is related to the surface pressure and frictional force distribution of cylinder during the low-speed planing. There is a linear relationship between the drag coefficient and the submerged depth during the cylinder planing at different submerged depths.

Hydrodynamic Characteristics Change of the Pearl River Delta Channel Network in the Recent 50 Years

2012 ◽  
Vol 573-574 ◽  
pp. 415-420
Author(s):  
Chao Tan ◽  
Ben Sheng Huang ◽  
Qing Shu Yang ◽  
Jing Qiu
Keyword(s):  
Pearl River Delta ◽  
Hydrodynamic Characteristic ◽  
River Delta ◽  
Pearl River ◽  
Hydrodynamic Characteristics ◽  
Main Stream ◽  
Channel Network ◽  
The Pearl River Delta ◽  
The 1950S ◽  
The Pearl River

The Pearl River delta channel network in the 1950s and 1990s is modeled and validated, and the hydrodynamic characteristic is analyzed during flood and drought at the same time. The study result shows that the model well simulates the real situation, which can be used for hydrodynamic characteristics analysis; There were obvious split ratio changes in the main branch in the late 50 years, the change degree of node in North River and near by is greater than West River’s. The waterlevel line of the West River main stream in the 1990s is generally lower than in the 1950s, especially the upstream of West River is more dramatic decline. River terrain changes caused by intensive human activities is the main reason why hydrodynamic force of the Pearl River Delta channel network district changed for the past 50 years.

Stereological Analyses of Hepatocyte Ultrastructure Monitor Arsenic Liver Burdens

1980 ◽  
Vol 38 ◽  
pp. 442-443
Author(s):  
E. M. B. Sorensen ◽  
R. R. Mitchell ◽  
L. L. Graham
Keyword(s):  
Drainage System ◽  
Water Levels ◽  
Ultrastructural Changes ◽  
Hepatocyte Ultrastructure ◽  
Lepomis Cyanellus ◽  
Large Numbers ◽  
Activation Data ◽  
Water Analyses ◽  
Municipal Lake ◽  
Green Sunfish

Endemic freshwater teleosts were collected from a portion of the Navosota River drainage system which had been inadvertently contaminated with arsenic wastes from a firm manufacturing arsenical pesticides and herbicides. At the time of collection these fish were exposed to a concentration of 13.6 ppm arsenic in the water; levels ranged from 1.0 to 20.0 ppm during the four-month period prior. Scale annuli counts and prior water analyses indicated that these fish had been exposed for a lifetime. Neutron activation data showed that Lepomis cyanellus (green sunfish) had accumulated from 6.1 to 64.2 ppm arsenic in the liver, which is the major detoxification organ in arsenic poisoning. Examination of livers for ultrastructural changes revealed the presence of electron dense bodies and large numbers of autophagic vacuoles (AV) and necrotic bodies (NB) (1), as previously observed in this same species following laboratory exposures to sodium arsenate (2). In addition, abnormal lysosomes (AL), necrotic areas (NA), proliferated rough endoplasmic reticulum (RER), and fibrous bodies (FB) were observed. In order to assess whether the extent of these cellular changes was related to the concentration of arsenic in the liver, stereological measurements of the volume and surface densities of changes were compared with levels of arsenic in the livers of fish from both Municipal Lake and an area known to contain no detectable level of arsenic.

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