Influence of Water Flow on the Stability of Geosynthetic-Soil Layered Systems on Slopes

1995 ◽  
Vol 2 (6) ◽  
pp. 1149-1180 ◽  
Author(s):  
J.P. Giroud ◽  
R.C. Bachus ◽  
R. Bonaparte
Keyword(s):  
Water Flow ◽  
Layered Systems ◽  
Influence Of Water ◽  
The Stability

scholarly journals Glacial lake drainage: a stability analysis

1997 ◽  
Vol 24 ◽  
pp. 175-180
Author(s):  
Krzysztof Szilder ◽  
Edward P. Lozowski ◽  
Martin J. Sharp
Keyword(s):  
Differential Equations ◽  
Water Flow ◽  
Frictional Heating ◽  
Initial Perturbation ◽  
Tunnel Wall ◽  
Cross Sectional ◽  
Linear Ordinary Differential Equations ◽  
Simplifying Assumptions ◽  
Lake Drainage ◽  
The Stability

A model has been formulated to determine the stability regimes for water flow in a Subglacial conduit draining from a reservoir. The physics of the water flow is described with a set of differential equations expressing conservation of mass, momentum and energy. Non-steady flow of water in the conduit is considered, the conduit being simultaneously enlarged by frictional heating and compressed by plastic deformation in response to the pressure difference across the tunnel wall. With the aid of simplifying assumptions, a mathematical model has been constructed from two time-dependent, non-linear, ordinary differential equations, which describe the time evolution of the conduit cross-sectional area and the water depth in the reservoir. The model has been used to study the influence of conduit area and reservoir levels on the stability of the water flow for various glacier and ice-sheet configurations. The region of the parameter space where the system can achieve equilibrium has been identified. However, in the majority of cases the equilibrium is unstable, and an initial perturbation from equilibrium may lead to a catastrophic outburst of water which empties the reservoir.

scholarly journals Studi Pengaruh Sudut Belokan Sungai Terhadap Volume Gerusan

2017 ◽  
Vol 4 (1) ◽  
pp. 60 ◽  
Author(s):  
Hasdaryatmin Djufri
Keyword(s):  
Experimental Model ◽  
Water Flow ◽  
Model Tests ◽  
Sand Layer ◽  
Flow Discharge ◽  
Layer Density ◽  
Artificial Channel ◽  
River Bends ◽  
The Stability ◽  
River Bend

Scouring occurs along the streams and generally increases in their bend areas. This occurence threaten the stability of buildings and facilities built around those areas. This study was conducted by experimental model tests in a laboratory using an artificial channel made of sand with diameter of 0,47 mm and the sand layer density of 1,47 gr/cm3. To assess the effect of river bends on the extent of scours, the water flow was simulated on the artificial channel in 9 times i.e.; 3 variations in the angle of river bends (α) and 3 variations in the flow discharge (Q) for each river bend variation. This study revealed that the volume of scours positively correlated to the angle of river bends. The volume of scours decreased more 20% when the angle of river bends decresed from 60º to 30º. The increase of the flow discharge also enlarged the volume of scours more than 100% at the river bends with small angles

scholarly journals Measurement of xylem water pressure using High-Capacity Tensiometer and benchmarking against Pressure Chamber and Thermocouple Psychrometer

2020 ◽  
Vol 195 ◽  
pp. 03014
Author(s):  
Roberta Dainese ◽  
Giuseppe Tedeschi ◽  
Thierry Fourcaud ◽  
Alessandro Tarantino
Keyword(s):  
Water Flow ◽  
Water Pressure ◽  
High Capacity ◽  
Ground Surface ◽  
Pressure Chamber ◽  
Rainwater Infiltration ◽  
Thermocouple Psychrometer ◽  
Earth Structures ◽  
Pressure Water ◽  
The Stability

The response of the shallow portion of the ground (vadose zone) and of earth structures is affected by the interaction with the atmosphere. Rainwater infiltration and evapotranspiration affect the stability of man-made and natural slopes and cause shallow foundations and embankments to settle and heave. Very frequently, the ground surface is covered by vegetation and, as a result, transpiration plays a major role in ground-atmosphere interaction. The soil, the plant, and the atmosphere form a continuous hydraulic system, which is referred to as Soil-Plant-Atmosphere Continuum (SPAC). The SPAC actually represents the ‘boundary condition’ of the geotechnical water flow problem. Water flow in soil and plant takes place because of gradients in hydraulic head triggered by the negative water pressure (water tension) generated in the leaf stomata. To study the response of the SPAC, (negative) water pressure needs to be measured not only in the soil but also in the plant. The paper presents a novel technique to measure the xylem water pressure based on the use of the High-Capacity Tensiometer (HCT), which is benchmarked against conventional techniques for xylem water pressure measurements, i.e. the Pressure Chamber (PC) and the Thermocouple Psychrometer (TP).

The Influence of water flow rate on Pumping Rate in Mytilus Edulis using a Refined Direct Measurement Apparatus

1976 ◽  
Vol 56 (2) ◽  
pp. 311-319 ◽  
Author(s):  
D. I. Hildreth
Keyword(s):  
Water Flow ◽  
Direct Measurement ◽  
Water Flow Rate ◽  
Mantle Cavity ◽  
Water Current ◽  
Ciliary Activity ◽  
Pumping Rate ◽  
Influence Of Water ◽  
Food Particles ◽  
Flow Through

INTRODUCTIONWork on pumping and filtration rates of bivalve molluscs was initially concerned with the physiological concept of pumping water through the mantle cavity. Comprehensive reviews are given by Winter (1970) and Ali (1971). The methods are of two kinds; direct, in which the flow of exhaled water itself is measured, and indirect, in which the rate of clearance of food particles is used to calculate water flow through the gills.There is a disadvantage in the indirect method when used to calculate volumes of water pumped because it involves the assumption that a fixed percentage (often 100% with large particles) of the particulate matter passing through the gill system is retained. Pumping rate is thus estimated as a function of the particle collecting properties of the latero-frontal cirri, whereas the water current is produced by the lateral cilia. Although the structure of the latero-frontal cirri is now well documented (Moore, 1971), their efficiency in particle retention can alter under certain conditions (Dral, 1967). There is need, therefore, for direct measurement of the quantity of water pumped. Recent advances in the understanding of branchial innervation and the control of lateral ciliary activity also reinforce this point (Aiello, 1960, 1962, 1970; Paparo, 1972, 1973).The constant level chamber for direct measurement of pumping rate was devised by Galtsoff (1926), to ensure that separation of the exhalant water current from the bivalve was not interfered with by pressure differences produced by the process of separation. The apparatus has been used in various forms by Galtsoff (1926, 1928, 1946), Nelson (1935, 1936), Collier & Ray (1948), Loosanoff & Engle (1947), Loosanoff & Nomejko (1946) and more recently by Drinnan (1964) and Davids (1964).

Influence of water flow on pipe inspection

2005 ◽  
Author(s):  
Rais Ahmad ◽  
Sourav Banerjee ◽  
Tribikram Kundu
Keyword(s):  
Water Flow ◽  
Pipe Inspection ◽  
Influence Of Water

Seventh International Conference on the Stability of Ships and Ocean Vehicles (STAB’ 2000)—A Review

2001 ◽  
Vol 38 (01) ◽  
pp. 1-8
Author(s):  
Vadim L. Belenky
Keyword(s):  
High Speed ◽  
Test Procedures ◽  
International Conference ◽  
Water On Deck ◽  
Beam Seas ◽  
Damage Stability ◽  
Influence Of Water ◽  
Roll Stabilization ◽  
The Stability ◽  
Operational Aspects

A brief review is given of the papers presented at the 7th International Conference on the Stability of Ships and Ocean Vehicles, held 7–12 February 2000 in Launceston, Australia. The review covers the following stability-related subjects: human factors, stability standards, operational aspects, influence of water on deck, damage stability, stability in following and quartering seas, stability of high-speed craft and sailing yachts, nonlinear dynamics of ships, test procedures, roll stabilization and cargo shift, waves and the environment, rolling in beam seas and stability of particular types of ships.

The Stability of a Radial Wall Jet

1977 ◽  
Vol 28 (4) ◽  
pp. 247-258 ◽  
Author(s):  
Yutaka Tsuji ◽  
Yoshinobu Morikawa ◽  
Masaaki Sakou
Keyword(s):  
Linear Stability ◽  
Water Flow ◽  
Wall Jet ◽  
Two Dimensional ◽  
Radial Wall ◽  
Linear Region ◽  
Stability Calculation ◽  
Amplification Rate ◽  
Vortex Patterns ◽  
The Stability

SummaryMeasured stability characteristics in a radial wall jet were compared with calculated results for a two-dimensional wall jet. It was found that the stability of the radial wall jet is similar in many respects to that of the two-dimensional wall jet. An exception is that the local amplification rate of the disturbance velocity is much higher than in the two-dimensional case. It was also found that quarter-harmonics appear in the non-linear region, as well as half-harmonics, and that their amplitude distributions show profiles similar to that of the fundamental component. Further, vortex patterns were visualised in water flow, and results corresponding to measurements in air flow and to the linear stability calculation were obtained.

scholarly journals Influence of water evaporation/absorption on the stability of glycerol–water marbles

RSC Advances ◽  
2019 ◽  
Vol 9 (59) ◽  
pp. 34465-34471 ◽  
Author(s):  
Xinxing Lin ◽  
Wei Ma ◽  
Lihui Chen ◽  
Liulian Huang ◽  
Hui Wu ◽  
...  
Keyword(s):  
Water Evaporation ◽  
Glycerol Water ◽  
Influence Of Water ◽  
The Stability

The influence of water evaporation and absorption on the stability of aqueous glycerol marbles was investigated.

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