scholarly journals RΟCKFALL S DURING THE EARTHQUAKE OF 14/8/03 AND PROBABLE SOLUTIONS AT THE UPPER LEVEL OF DRIMONA S VILLAGE SLOPE, MUNICIPALITY OF SFAKIOTON LEUKADA ISLAND

2004 ◽  
Vol 36 (4) ◽  
pp. 1735
Author(s):  
Δ. Βογιατζής ◽  
A. Δημητρίου ◽  
Γ. Παπαθανασίου ◽  
Β. Χρηστάρας ◽  
Ν. Καντηράνης ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Slope Angle ◽  
Upper Triassic ◽  
Hill Slope ◽  
Starting Point ◽  
Upper Level ◽  
The Hill ◽  
Vertical Jumps

Big rocky blocks of indicative dimensions of 2.5*2.5x2.5 m, were activated and fell down-slope during the earthquake (Ms=6.4) of 14/8/03 from the upper part of the hill slope behind Drimon village (Municipality of Sfakiotes in Leukada island). The area is geologically composed of thick bedded white neritic limestones, of Pantokratoras unit (Upper Triassic age). The slope angle is roughly 50° to the NW, at the place of rockfall activation. The limestone is cut in blocks of edge 2-3 m long, due to the geometry of the tectonic discontinuities and the orientation of bedding. In this paper, the mechanism of rockfalls was studied regarding to their horizontal and vertical jumps as well as their kinetic energy. Furthermore, the type, the geometry, the place of installation and the necessary absorbing capacity of barriers were studied for restraining future rockfalls in the area. According to our study, the blocks are necessary to be tied, in place, at the upper part of the slope, using bolting, wire cable and wire netting techniques. Nevertheless, two elastic metallic barriers, approximately 100 m long and 5 m high, able to absorb kinetic energy of 3000 kJ, were decided to be installed on the slope, for the case that blocks, of mean dimensions 2.5x2.5x2.5 m, fall down. These barriers will be placed at horizontal distances of 38.22 m and 94.08 m, from the rockfalls starting point.

The Application of WiFi-based Wireless Sensor Network (WSN) in Hill Slope Condition Monitoring

2015 ◽  
Vol 73 (3) ◽  
Author(s):  
Mohd Amri Md Yunus ◽  
Sallehuddin Ibrahim ◽  
Mohd Taufiq Md Khairi ◽  
Mahdi Faramarzi
Keyword(s):  
Wireless Sensor Network ◽  
Moisture Content ◽  
Sensor Network ◽  
Safety Factor ◽  
Slope Angle ◽  
Wireless Sensor ◽  
Average Moisture Content ◽  
Landslide Monitoring ◽  
Hill Slope ◽  
The Hill

In this paper, a wireless sensor network for landslide monitoring (WSNLM) system is described. WSNLM utilized a wireless protocol which is 802.11g. The hardware structure of the WSNLM is discussed where the important parts had been discussed in details. In order to assess the susceptibility of a hill slope to landslide, several parameters had been considered for the network. The important factors that affect landslide is the ground status, which is soil moisture, vibration in the land and also soil temperature. Other factors that can relate to landslide is the environment of the surrounding such as air temperature, humidity and atmospheric pressure. The outputs from the ADXL335 accelerometer were used for slope angle measurement. The output ofa vibration transducer was also used to monitor the hill slope. To account for the susceptibility of the hill slope to the land slide, safety factor value is calculated in real time. The outcomes show that the average moisture content in the soil is around 3 % on a sunny day and the safety factor for a sunny day is around 75. The moisture content in the soil on a rainy day increases tremendously to more than 20 %. At the same time, the safety factor drops to around 70. The system in this paper has the potential to be used as a useful tool for the detection of lanslides.

scholarly journals Structure, Energy, and Parameterization of Inertia–Gravity Waves in Dry and Moist Simulations of a Baroclinic Wave Life Cycle

2014 ◽  
Vol 71 (7) ◽  
pp. 2390-2414 ◽  
Author(s):  
Mohammad Mirzaei ◽  
Christoph Zülicke ◽  
Ali R. Mohebalhojeh ◽  
Farhang Ahmadi-Givi ◽  
Riwal Plougonven
Keyword(s):  
Life Cycle ◽  
Kinetic Energy ◽  
Gravity Wave ◽  
Wave Energy ◽  
General Circulation ◽  
Eddy Kinetic Energy ◽  
Baroclinic Wave ◽  
Starting Point ◽  
Upper Level ◽  
The Impact

Abstract The impact of moisture on inertia–gravity wave generation is assessed for an idealized unstable baroclinic wave using the Weather Research and Forecasting Model (WRF) in a channel on the f plane. The evolution of these waves in a moist simulation is compared with a dry simulation. The centers of action for inertia–gravity wave activity are identified as the equatorward-moving upper-level front and the poleward-progressing upper-level jet–surface front system. Four stratospheric wave packets are found, which are significantly more intense in the moist simulation and have slightly higher frequency. They are characterized by their structure and position during the baroclinic wave life cycle and are related to forcing terms in jet, front, and convection systems. By exploring the time series of mass and energy, it is shown that the release of latent heat leads to a change in enthalpy, an increase in the eddy kinetic energy, and an intensification of the inertia–gravity wave energy. The ratio of the inertia–gravity wave energy to the eddy kinetic energy is estimated to be about 1/200 for the moist simulation, which is 3 times larger than that for the dry simulation. An empirical parameterization scheme for the inertia–gravity wave energy is proposed, based on the fast large-scale ageostrophic flow associated with the jet, front, and convection. The diagnosed stratospheric inertia–gravity wave energy is well captured by this parameterization in six WRF simulations with different moisture and resolutions. The approach used to construct the parameterization may serve as a starting point for state-dependent nonorographic gravity wave drag schemes in general circulation models.

scholarly journals Lidar-Based Morphometry of Conical Hills in Temperate Karst Areas in Slovenia

2021 ◽  
Vol 13 (14) ◽  
pp. 2668
Author(s):  
Tamás Telbisz
Keyword(s):  
Empirical Distribution ◽  
Inverse Gaussian ◽  
Digital Terrain ◽  
Terrain Models ◽  
Starting Point ◽  
Significant Difference ◽  
Karst Areas ◽  
Hill Area ◽  
The Hill ◽  
Comprehensive Study

Conical hills, or residual hills, are frequently mentioned landforms in the context of humid tropical karsts as they are dominant surface elements there. Residual hills are also present in temperate karsts, but generally in a less remarkable way. These landforms have not been thoroughly addressed in the literature to date, therefore the present article is the first attempt to morphometrically characterize temperate zone residual karst hills. We use the methods already developed for doline morphometry, and we apply them to the “inverse” topography using LiDAR-based digital terrain models (DTMs) of three Slovenian sample areas. The characteristics of hills and depressions are analysed in parallel, taking into account the rank of the forms. A common feature of hills and dolines is that, for both types, the empirical distribution of planform areas has a strongly positive skew. After logarithmic transformation, these distributions can be approximated by Inverse Gaussian, Normal, and Weibull distributions. Along with the rank, the planform area and vertical extent of the hills and dolines increase similarly. High circularity is characteristic only of the first-rank forms for both dolines and hills. For the sample areas, the the hill area ratios and the doline area ratios have similar values, but the total extent of the hills is slightly larger in each case. A difference between dolines and hills is that the shapes of hills are more similar to one another than those of dolines. The reason for this is that the larger, closed depressions are created by lateral coalescence, while the hills are residual forms carved from large blocks. Another significant difference is that the density of dolines is much higher than that of hills. This article is intended as a methodological starting point for a new topic, aiming at the comprehensive study of residual karst hills across different climatic areas.

Wind tunnel tests and dynamic analysis of wind-induced response of a transmission tower on a hill

2021 ◽  
pp. 136943322110339
Author(s):  
Jian Guo ◽  
Changliang Xiao ◽  
Jiantao Li
Keyword(s):  
Wind Tunnel ◽  
Wind Field ◽  
Dynamic Responses ◽  
Interactive Effects ◽  
Induced Response ◽  
Transmission Tower ◽  
Structural Dynamic ◽  
Wind Tunnel Tests ◽  
Hill Slope ◽  
The Hill

A hill with a lattice transmission tower presents complex wind field characteristics. The commonly used computational fluid dynamics (CFD) simulations are difficult to analyze the wind resistance and dynamic responses of the transmission tower due to structural complexity. In this study, wind tunnel tests and numerical simulations are conducted to analyze the wind field of the hill and the dynamic responses of the transmission tower built on it. The hill models with different slopes are investigated by wind tunnel tests to measure the wind field characteristics, such as mean speed and turbulence intensity. The study shows that the existence of a transmission tower reduces the wind speed on the leeward slope significantly but has little effect on the windward slope. To study the dynamic behavior of the transmission tower, a hybrid analysis procedure is used by introducing the measured experimental wind information to the finite element tower model established using ANSYS. The effects of hill slope on the maximum displacement response of the tower are studied. The results show that the maximum value of the response is the largest when the hill slope is 25° compared to those when hill slope is 15° and 35°. The results extend the knowledge concerning wind tunnel tests on hills of different terrain and provide a comprehensive understanding of the interactive effects between the hill and existing transmission tower regarding to the wind field characteristics and structural dynamic responses.

scholarly journals Integrated Simulation Modeling Approach for Investigating Pore Water Pressure Induced Landslides

2022 ◽  
Author(s):  
Sahila Beegum ◽  
P J Jainet ◽  
Dawn Emil ◽  
K P Sudheer ◽  
Saurav Das
Keyword(s):  
Pore Water ◽  
Factor Of Safety ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Simulation Models ◽  
Integrated Simulation ◽  
Hill Slope ◽  
Slope Factor ◽  
The Stability ◽  
The Hill

Abstract Soil pore water pressure analysis is crucial for understanding landslide initiation and prediction. However, field-scale transient pore water pressure measurements are complex. This study investigates the integrated application of simulation models (HYDRUS-2D/3D and GeoStudio–Slope/W) to analyze pore water pressure-induced landslides. The proposed methodology is illustrated and validated using a case study (landslide in India, 2018). Model simulated pore water pressure was correlated with the stability of hillslope, and simulation results were found to be co-aligned with the actual landslide that occurred in 2018. Simulations were carried out for natural and modified hill slope geometry in the study area. The volume of water in the hill slope, temporal and spatial evolution of pore water pressure, and factor of safety were analysed. Results indicated higher stability in natural hillslope (factor of safety of 1.243) compared to modified hill slope (factor of safety of 0.946) despite a higher pore water pressure in the natural hillslope. The study demonstrates the integrated applicability of the physics-based models in analyzing the stability of hill slopes under varying pore water pressure and hill slope geometry and its accuracy in predicting future landslides.

Rendezvous on the High Plateau

2013 ◽  
Author(s):  
Lars Öhrström
Keyword(s):  
World War Ii ◽  
Sea Level ◽  
World War ◽  
Life And Death ◽  
High Plateau ◽  
The North ◽  
Starting Point ◽  
The North Sea ◽  
National Flag ◽  
The Hill

The two men in white anoraks were slowly approaching, skiing in the bitter cold over the Hardangervidda mountain plateau in the winter of 1943. Were they friends or foes? This was a matter of life and death for the six young men watching the only other living beings in sight for miles of snow-clad wilderness. Their pace was slow, the men were thin and didn’t look too well, just as if they might well have spent 130 days of the winter of 1942–43 hidden in a rudimentary hut on the mountain, surviving on moss and poached reindeer. It had to be them. The group’s leader, Joachim Rønneberg, decided to make contact. This story is first a tragedy and then a success, and it does not begin on the Hardangervidda but in Scotland where Britain’s ski capital, the small town of Aviemore in the Cairngorms National Park, is going to be our starting point for several dangerous journeys across the North Sea. A few years ago we drove up the main mountain road, eventually leading to the Cairn Gorm peak itself, 4,084 feet (1,245 metres) above sea level, and passed the park’s visitors’ centre located in pretty surroundings by a small lake. We glimpsed something flapping in the wind that did look a bit like the Union Jack, an unlikely occurrence in the highlands. We turned around and took the path up the hill, and soon discovered that what we first mistook for the British ensign, because of its colours, was in fact the Norwegian national flag. In 1468, when the Norwegians gave away their last Scottish possessions to King James III in Edinburgh, the Norwegian flag had not even been invented, so we were a wee bit curious as to why it was flying here, in the heart of the Cairngorms. But of course, mountains, snow, and skiing—what could be more Norwegian? And this simplistic reasoning is actually closer to the answer than we might have thought, as a commemorative sign told us that on this spot were the lodgings of the famous Kompani Linge during World War II.

Seismic Fragility Analysis of Hill Buildings with Uneven Ground Column Heights

2014 ◽  
Vol 638-640 ◽  
pp. 1848-1853
Author(s):  
Lin Qing Huang ◽  
Li Ping Wang ◽  
Chao Lie Ning
Keyword(s):  
Seismic Vulnerability ◽  
Fragility Curves ◽  
Slope Angle ◽  
Seismic Fragility ◽  
Exceedance Probability ◽  
Considerable Influence ◽  
Analysis Method ◽  
Ground Acceleration ◽  
Mountainous Regions ◽  
The Hill

The hill buildings sited on slopes have been widely constructed in mountainous regions. In order to estimate the seismic vulnerability of the hill buildings with uneven ground column heights under the effect of potential earthquakes, the exceedance probabilities of the hill buildings sited on different angle slopes in peak ground acceleration (PGA) are calculated and compared by using the incremental dynamic analysis method. The fragility curves show the slope angle has considerable influence on the seismic performance. Specifically, the exceedance probability increases with the increasing of the slope angle at the same performance level.

scholarly journals Effect of mulching method and planting time on the yield and yield attributes of tomato in hill slope

1970 ◽  
Vol 34 (2) ◽  
pp. 227-232
Author(s):  
ZA Firoz ◽  
MM Zaman ◽  
MS Uddin ◽  
MH Akand
Keyword(s):  
Key Words ◽  
Agricultural Research ◽  
Combined Effect ◽  
Research Station ◽  
Yield Attributes ◽  
Planting Time ◽  
Agricultural Research Station ◽  
Tomato Yield ◽  
Hill Slope ◽  
The Hill

An experiment was conducted at the Hill Agricultural Research Station, Khagrachari from September 2002 to February 2003 to find out the effect of mulching method (Mulching one month before planting, mulching just after planting and no mulching) and planting times (01 October, 16 October and 01 November) on the yield and yield attributes of tomato in hill slope. The highest yield (21.43 t/ha) was obtained from plant where mulch was given one month before planting. Among three planting times, the highest yield (15.27 t/ha) was obtained from 01 October planting. In case of combined effect, mulching one month before planting with 01 October planting produced the highest yield (28.06 t/ha) of tomato in hill slope. Key Words: Mulching; planting time; tomato yield; hill slope.  DOI: 10.3329/bjar.v34i2.5793Bangladesh J. Agril. Res. 34(2): 227-232, June 2009

Using the instructional design process in tutorial development

2016 ◽  
Vol 44 (3) ◽  
pp. 309-323 ◽  
Author(s):  
Terri Artemchik
Keyword(s):  
Instructional Design ◽  
Design Process ◽  
Information Literacy ◽  
Business Students ◽  
Content Type ◽  
Instructional Design Process ◽  
Starting Point ◽  
Interactive Nature ◽  
Upper Level ◽  
Interactive Tutorial

Purpose This paper aims to explore innovative ways to integrate business information literacy and database instruction into courses that require in-depth research. Design/methodology/approach This paper outlines the use of the instructional design process to effectively develop specialized Guide on the Side (GotS) tutorials for upper-level business students. Findings Students valued the interactive nature of the GotS tutorials and appreciated that the instruction was at point of need. Research limitations/implications This paper describes one librarian’s journey of creating interactive tutorials with the instructional design process. It is a starting point for other academic librarians looking to embed tutorials in courses. Originality/value GotS is an interactive tutorial software and librarians are looking for effective ways to incorporate online tutorials into their information literacy instruction.

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