Subjects -> ENGINEERING (Total: 2688 journals)
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HYDRAULIC ENGINEERING (56 journals)

Showing 1 - 57 of 57 Journals sorted alphabetically
Air, Soil & Water Research     Open Access   (Followers: 6)
altlastenforum Baden-Württemberg e.V., Schriftenreihe     Full-text available via subscription   (Followers: 3)
American Journal of Fluid Dynamics     Open Access   (Followers: 48)
American Water Works Association     Hybrid Journal   (Followers: 23)
Annual Review of Fluid Mechanics     Full-text available via subscription   (Followers: 51)
Annual Review of Marine Science     Full-text available via subscription   (Followers: 12)
Archives of Hydro-Engineering and Environmental Mechanics     Open Access   (Followers: 1)
Asian Journal of Water, Environment and Pollution     Hybrid Journal   (Followers: 10)
AWWA Water Science     Hybrid Journal   (Followers: 1)
Bulletin of Marine Science     Full-text available via subscription   (Followers: 8)
Computers & Fluids     Hybrid Journal   (Followers: 30)
Development and Applications of Oceanic Engineering     Open Access   (Followers: 2)
Discover Water     Open Access  
Drinking Water Engineering and Science (DWES)     Open Access   (Followers: 7)
Ecohydrology & Hydrobiology     Full-text available via subscription   (Followers: 4)
Experimental Thermal and Fluid Science     Hybrid Journal   (Followers: 32)
Hydroécologie Appliquée     Full-text available via subscription  
Hydrology: Current Research     Open Access   (Followers: 9)
Hydrometallurgy     Hybrid Journal   (Followers: 11)
Ingeniería del agua     Open Access  
Ingeniería Hidráulica y Ambiental     Open Access  
International Journal of Fluid Power     Hybrid Journal   (Followers: 4)
International Journal of Hydraulic Engineering     Open Access   (Followers: 8)
International Journal of Hydrology Science and Technology     Hybrid Journal   (Followers: 6)
International Journal of Hydromechatronics     Hybrid Journal  
International Journal of Soil, Sediment and Water     Open Access   (Followers: 4)
ISH Journal of Hydraulic Engineering     Hybrid Journal  
Journal of Applied Water Engineering and Research     Hybrid Journal  
Journal of Coastal and Hydraulic Structures (JCHS)     Open Access   (Followers: 2)
Journal of Coastal and Riverine Flood Risk (JCRFR)     Open Access   (Followers: 1)
Journal of Ecohydraulics     Hybrid Journal   (Followers: 1)
Journal of Hydraulic Engineering     Full-text available via subscription   (Followers: 27)
Journal of Hydraulic Research     Partially Free   (Followers: 5)
Journal of Hydrodynamics     Hybrid Journal   (Followers: 2)
Journal of Hydrologic Engineering     Full-text available via subscription   (Followers: 40)
Journal of Hydrology and Hydromechanics     Open Access   (Followers: 4)
Journal of Marine Science and Application     Hybrid Journal   (Followers: 2)
Journal of Ocean University of China (English Edition)     Hybrid Journal   (Followers: 1)
Journal of the Marine Biological Association of the UK     Hybrid Journal   (Followers: 23)
Journal of Water Process Engineering     Full-text available via subscription   (Followers: 3)
Journal of Water Resources Planning and Management     Full-text available via subscription   (Followers: 65)
Journal of Waterway Port Coastal and Ocean Engineering     Full-text available via subscription   (Followers: 7)
LARHYSS Journal     Open Access  
LHB Hydroscience Journal     Open Access  
Limnology and Oceanography: Fluids and Environments     Full-text available via subscription   (Followers: 5)
Marine Genomics     Hybrid Journal   (Followers: 1)
Marine Science     Open Access   (Followers: 4)
Marine Structures     Hybrid Journal   (Followers: 4)
Maritime Studies     Open Access   (Followers: 13)
Navigation     Full-text available via subscription   (Followers: 269)
Proceedings of the Institution of Civil Engineers - Water Management     Hybrid Journal   (Followers: 7)
Regional Studies in Marine Science     Hybrid Journal   (Followers: 1)
Revista de Ingeniería Hidráulica y Ambiental     Open Access  
Revista Ingeniería Agrícola     Open Access  
Ribagua : Revista Iberoamericana del Agua     Open Access  
Water SA     Open Access   (Followers: 2)
Water Science and Engineering     Open Access   (Followers: 13)
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LARHYSS Journal
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1112-3680
Published by Université de Biskra Homepage  [1 journal]
  • TECHNICAL NOTE: ANALYTICAL RELATIONSHIP BETWEEN THE STRICKLER ROUGHNESS
           COEFFICIENT AND THE ABSOLUTE ROUGHNESS IN ROUGH TURBULENT FLOW REGIME

    • Authors: B. ACHOUR, L. AMARA
      Abstract: Manning-type relations do not contain the term viscosity, which limits their use to the field of rough turbulent flow. Strickler roughness coefficient k or n of Manning are estimated with great difficulty, requiring a proven practical experience. In order to simplify the problem and allow a rapid calculation of k, the main objective of the present study is to establish an explicit analytical relation which links k and the absolute roughness e. To do this, it was useful to combine the rational Darcy-Weisbach relationship and the empirical Manning-Strickler formula. After some development, the function , where  is the relative roughness, was clearly defined. It was possible to calculate the mean value of the function z in the practical range of such that F is equal to a constant. This constant is different from that proposed by the literature.
      PubDate: 2022-03-23
      Issue No: Vol. 0 (2022)
       
  • TRADITIONAL IRRIGATION SYSTEM AND METHODS OF WATER HARVESTING IN THE OASIS
           OF SFISSIFA KSOUR MOUNTAINS - ALGERIA

    • Authors: A. DERDOUR, N. BELAM, W. CHEBAB
      Abstract: Groundwater serves as the most reliable source of water both for domestic use and for irrigation in arid zones, which are characterized by low rainfall and high evaporation. To overcome the water scarcity in these regions traditional water management systems were locally developed. This study was conducted on the oasis of Sfissifa, which is situated in the Wilaya of Naâma in the southwest of Algeria.  The main objectives of this study are to present the ancestral agricultural system of the region named “Tissfalt” and to assess the suitability of groundwater for drinking and irrigational purposes. The essential idea of Tissfalt is that of a gently sloping tunnel, often along the radius of an alluvial fan, which extends upslope until the water table is tapped and emerges at the downslope end to supply the oasis. It plays an important role in the social and economic development of the oasis. It’s considered also as a factor of stability enabling and regulating social interactions. Groundwater samples were collected and analyzed for major anions and cations. Physicochemical parameters such as electrical conductivity (EC) and total dissolved solids (TDS) were also measured. From the results of the analyses and measurements, the assessment of water potential for drinking uses was evaluated using physicochemical parameters, while the suitability for irrigation was evaluated based on the sodium adsorption ratio (SAR) and the percentage sodium (%Na), Wilcox diagram was also applied. The results show that all water samples analyzed fell within Algerian Standards’ guidelines limit, and also classify the groundwater as excellent for irrigation purposes.
      PubDate: 2022-03-23
      Issue No: Vol. 0 (2022)
       
  • TRIANGULAR BROAD CRESTED WEIR THEORY AND EXPERIMENT

    • Authors: B. ACHOUR, L. AMARA
      Abstract: The article looked at the possibility of making use of a triangular broad crested device, provided with a crest height P and a constant apex angle q, as a flow measurement weir. The device has a triangular gorge which extends over a certain length L. This must be sufficient to allow the creation of a control section in a given section of the gorge, which represents the prerequisite condition for the proper functioning of the device. Inserted in a rectangular channel of width B for which the measurement of the flow rate Q is needed, the device causes a lateral contraction of the cross section located above the crest height P. It is shown that the dimensionless parameter  reflects the effect of this lateral contraction, where , and  is the upstream flow depth counted above the crest. Due to the crest height P, the flow also undergoes vertical contraction. The effect of both lateral and vertical contractions can be grouped together in a single dimensionless parameter noted y such that  where  denotes the relative crest height.After the detailed description of the device as well as the resulting flow, a dimensional analysis has been proposed in order to identify the parameters on which the discharge coefficient  of the device depends. It has been clearly demonstrated that the flow coefficient can be written as a function of both  and , i.e. .In order to define the function l, a theoretical approach is proposed based on the momentum theorem and the energy equation. This approach turned out to be judicious since it led to expressing the theoretical relationship that governs the discharge coefficient . This was presented as an explicit function of the dimensionless parameter y, depending therefore on both  and  as predicted by dimensional analysis.After that, experimental tests were rigorously carried out on six devices with different geometric characteristics. The objective was to verify the validity of the theoretical relationship governing the discharge coefficient. The tests were carried out under suitable hydraulic conditions and the flow rate Q and the upstream depth h1 were measured using high precision instruments. In total, 122 measurement points were collected and were carefully analyzed. The use of linear least-squares fitting method involving experimental and theoretical data gave the following trend line relationship: It was thus concluded that the theoretical discharge coefficient relationship did not need any correction and it could be used with great confidence since the maximum deviation observed rarely reached 0.2%. This is also the case for the relationship that governs the flow rate Q.
      PubDate: 2022-03-23
      Issue No: Vol. 0 (2022)
       
  • THEORETICAL AND EXPERIMENTAL ANALYSIS OF SEQUENCE DEPTH RATIO AND ENERGY
           LOSS IN AN ABRUPTLY ENLARGED TRAPEZOIDAL CHANNEL

    • Authors: A. BENMALEK, M. DEBABECHE
      Abstract: Among the hydraulic parameters describing the classical hydraulic jump are the inflow Froude number, the sequence depth ratio, the jump surface profile, and the energy loss.Literature analysis showed that these parameters varied according to the shape of the studied section and the upstream flow conditions, such as the flow discharge and the initial height at the toe of the jump.The present study examines, theoretically and experimentally, the effect of enlargement on the sequence depth ratio, the relative energy loss, and the jump surface profile. The study was based on an experimental model in which an inserted abruptly enlarged trapezoidal channel was directed towards a rectangular channel.Comparison of experimental and theoretical results showed that the physical and economic interest of flow through the considered section is conditioned by the frictional force effect due to the enlargement. These findings can be useful in the design of energy stilling basins and in hydraulic jump performance.
      PubDate: 2022-03-23
      Issue No: Vol. 0 (2022)
       
  • RECTANGULAR BROAD-CRESTED FLOW METER WITH LATERAL CONTRACTION –
           THEORY AND EXPERIMENT

    • Authors: B. ACHOUR, L. AMARA
      Abstract: An in-depth theoretical and experimental study is carried out on a semi-modular device for measuring flow in open channels, in the current instance a rectangular open-channel of width B. The device is provided with both a crest height P and a lateral contraction forming a gorge of opening width b extending over the entire length L of the apparatus. This is chosen so as to ensure in all cases the appearance of a control section inside the gorge. This is the prerequisite condition for the correct functioning of the apparatus as a flow measuring device. The flow undergoes the double effect of a lateral and vertical contraction which is reflected in the following dimensionless parameters  and  where  is the upstream flow depth counted over the crest height. It is shown that these two parameters can be grouped together in a single y variable such that  varying in the range .  The main objective of the theoretical study is to derive the stage-discharge relationship (Q - ) and therefore that of the discharge coefficient  of the device. This ultimate goal is comfortably achieved based on both the momentum theorem and the energy equation, after having made certain fully justified simplifying assumptions.The theoretical stage-discharge relationship thus obtained is consistent with semi-modular devices since the flow rate Q depends both on the geometric characteristics of the device and on the upstream depth h1. Regarding the derived theoretical relationship governing the discharge coefficient, it explicitly indicates the dependence of Cd with respect to the dimensionless parameter y exclusively, i.e. b and  parameters, which is predicted by dimensional analysis.The theoretical discharge coefficient relationship is subjected to an experimental program as intense as it is strict. The objective is either to validate this relationship or to correct it for the effect of a correction factor if the theoretical and experimental values present some deviations.No less than 240 measurement points are collected during tests carried out on thirteen devices with different geometric characteristics. The 240 experimental and theoretical values of the discharge coefficient are compared with each other revealing a near perfect agreement since the ratio  is extremely close to unity. This high-quality result suggests that the theoretical relationship governing the discharge coefficient can be used with confidence in its current form without undergoing any correction. Therefore, it is quite obvious to conclude that the theoretical relationship of the flow rate Q is also reliable and does not require any adjustment or correction.
      PubDate: 2022-03-23
      Issue No: Vol. 0 (2022)
       
  • HYDRODYNAMIC INVESTIGATIONS OF INVERTED SYPHON’S FRAGMENT

    • Authors: A.V. BURLACHENKO, O.N. CHERNYKH, N.V. KHANOV
      Abstract: In this article are presented the results of studying the operating conditions in the transient mode of an inverted syphon with rectangular pipes, which at the same time experience increased hydrodynamic loads, often leading to one or another destruction. Also are presented the results of the study of pressure fluctuations in various sections of the bottom along the length of the transit part of a tubular structure of a inverted syphon type with a rectangular cross section. Was modeled the design of the inverted syphon with two breaks along the length and three types of inlet portals: smooth, "hood" type and portal wall. It has been established that the conditions of formation and features of the hydraulic operation of the inverted syphon in the transient mode are mainly determined by its design features. With the flooding of the inlet portal, the flow of air into the pipe is hindered and a transition mode of the second type is formed. At a certain flow rate, depending on the design of the input "self-charging" portal (of the "hood" type or smooth), the second type of transient mode is replaced by the first. Level fluctuations in the headrace in the both cases are insignificant. Also, is given the data on the distribution of the pulsating pressure component, its intensity and spectral density in various sections along the length of the pipe. The maximum intensity of pressure pulsation (the ratio of the pressure pulsation standard to the velocity head in the pressure section of the pipe) is observed with a hood-type portal – 1.3 (with a flow rate parameter of 0.95). With a smooth portal it is slightly lower (about 0.95 at a flow rate of 1.19), but the highest standard of pressure pulsation occurred with a soft portal and corresponded to high flow. The maximum was in the measuring section, located at the beginning of the horizontal section of the pipe. Recommendations are given on establishing the boundaries of the existence of a transient mode and on the intensity of pressure pulsation in various sections along the length of the pipe with an analysis of the spectral characteristics and a discussion of measures that ensure a decrease in pulsation during transient modes. In the initial phase of the transition mode, the spectrum is mainly narrow-band with a frequency of about 0.28 Hz, and with an increase in the frequency of air bubbles, it expands and the leading frequency of pulsation oscillations increases. At maximum loads, the leading frequency of the pressure pulsation is located in the infra-frequency zone. With the onset of the pressure mode, the leading frequency approached 3 Hz. A comparison with the results of studies by other authors is given. It has been established that the existing recommendations on setting the maximum intensity of pressure pulsation in tubular structures during transient conditions (no more than 0.2) are valid only for specific types of the studied structures and their operating conditions.
      PubDate: 2022-03-23
      Issue No: Vol. 0 (2022)
       
  • WHEN THE SAND OF THE SAHARA LEAVES ITS TERRITORY – MECHANISM OF DUST
           RISING

    • Authors: B. REMINI
      Abstract: This paper deals with the mechanism of the uplift of dust from the Sahara in the atmosphere. The first study carried out in 2001 showed that it is at the level of the mega-obstacles of the Sahara that the wind dynamics are very active. So, if there is dust rising, it will be at the level of these rock masses. To answer these hypotheses, we used satellite images taken over the Sahara during the period: 2001-2021. The results obtained showed that the Sahara recorded about 875 dust lifts during the period: 2001-2021. It is these uplifts that can send dust flying over the Atlantic. The years 2017 and 2020 recorded the highest number of dust lifts exceeding 600 days. Three types of dust lifting were highlighted: weak (Duration < 3 days), medium (7 days > duration ≥ 3 days) and strong (Duration ≥ 7 days). We have defined effective uplift as uplift capable of propelling a significant amount of dust into the atmosphere. A map of dust lifting areas in the Sahara has been established. Three foci of dust risings in the Sahara have been located. These are the areas induced by the mega-obstacles: Hoggar-Tassili N'Ajjer (Algeria), Aïr (Niger) as well as Tibesti and Ennedi (Chad).
      PubDate: 2022-03-23
      Issue No: Vol. 0 (2022)
       
  • OUED EL ABIOD BASIN (ALGERIA): SOLID TRANSPORT ESTIMATION BY THREE
           ARTIFICIAL NEURAL NETWORK METHODS

    • Authors: A. BOUGAMOUZA, B. REMINI, A. AMMARI, F. SAKHRAOUI
      Abstract: The assessment of sediment transport in river is important in water resource management such as the design and control dams and other hydraulic structures. In this paper, Three Artificial Neural Network methods are used to estimate the daily suspended sediment concentration for the corresponding daily discharge flow in the river of Oued El Abiod watershed, Biskra, Algeria. The Feed-forward Neural Networks (FFNN), generalized regression neural networks (GRNN) and the radial basis neural networks (RBNN) models are established for estimating current suspended sediment values. The two criteria RMSE and R2 were used to evaluate the performance of applied models. The comparison of three models showed that the RBNN method provided generally the better than the other methods in estimation of suspended sediment. Therefore, the ANN model had capability to improve nonlinear relationships between discharge flow and suspended sediment with reasonable precision.
      PubDate: 2022-03-23
      Issue No: Vol. 0 (2022)
       
  • SIMULATING CHANNEL BIFURCATION FLOWS WITH WEIRS FOR FLOOD RISK REDUCTION

    • Authors: J.K. NG, C.Y. TAN, A. SELVARAJOO, M.R.M. HANIFFAH, E.H. KASIMAN, S.H. LAI, D. YUAN, F.Y. TEO
      Abstract: Weir is widely used for controlling the flow discharges and water levels of a bifurcated river for flood risk reduction. The effects of weir on the bifurcation flow properties and hydrodynamic processes were not systematically studied by previous research, some of these have limitations and only showed that the discharge ratios were varied by the changes of weir height. Thus, there is a need to further explore on the effect of overall weir geometry and weir location on flow properties. In this study, an one-dimensional (1D) numerical model of Hydrological Engineering Centre - River Analysis System (HEC-RAS) has been applied to simulate an idealised channel with the applications of a variety of weir geometries at various locations. The model has been set to simulate a U-shaped main channel with two identical U-shaped bifurcated channels. Simulations have been undertaken for the weirs with cross-sectional shapes of rectangular, Cipolletti (trapezoidal), and V-notch (triangular). Comparisons of velocity profiles and water elevations with different Froude numbers have been undertaken. The results present the relationships of the outlet discharge ratio and velocity ratio to weir height, crest length, and crest angle ratio with different cross-sectional shapes and locations of weir. The findings show that flood risks could be potentially reduced by understanding the flow behaviours of channel bifurcation with presence of weirs as controlled structure.
      PubDate: 2022-03-23
      Issue No: Vol. 0 (2022)
       
  • EXPERIMENTAL STUDY OF THE SEQUENT DEPTHS RATIO OF THE HYDRAULIC JUMP IN A
           RECTANGULAR COMPOUND CHANNEL WITH A ROUGH MINOR BED

    • Authors: W. DJAMAA, A. GHOMRI, A. AL-FAWZY
      Abstract: The present knowledge on the behavior of hydraulic jumps is only for smooth, horizontal channel beds. Very limited studies have been reported in the literature on the performance of hydraulic jumps on rough beds.The objective of our study is to investigate the sequent depth ratio of hydraulic jumps in a rectangular compound channel with a rough minor bed under different flow conditions using laboratory investigations. A series of experiments were carried out in a rectangular compound channel flume, which consists of artificially roughened beds formed by homogeneous plastic pellets.The hydraulic parameters, such as first sequence depth h1, second sequence depth h2, and flow rate, were measured for different bed roughnesses. The analysis of experimental data showed that the rough bed reduces the sequent depth ratio more than those on smooth beds while creating a high energy loss. With the availability of a large number of experimental data on hydraulic jumps over rough channel beds, mathematical formulations were obtained to express the sequent depth ratio of hydraulic jumps to roughness parameters such as roughness height.
      PubDate: 2022-03-23
      Issue No: Vol. 0 (2022)
       
 
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