Hydraulic Works Research Articles

Assessing the Effects of Alluvial Transport in the Kizilirmak River on Dams with Local, Photogrammetric and Remote Sensing Methods

Naturally transported sand, clay, and gravel-like blocks by rivers cause a decrease in water flow and flow velocity. Additionally, uncontrolled disposal of waste materials into the riverbed increases adverse effects and endangers natural life. Over time, the alluvium generated by natural and external factors in river and creek beds leads to flood risks that pose a significant threat to life and property. These sediments, known as alluvium, accumulate in favorable locations in valleys and form alluvial beds with spread movement to broader areas. In Turkey, interventions in river branches and creek beds, as well as insufficient preventive measures, have kept floods a hot topic. To eliminate these issues, it is crucial for every organization to take comprehensive measures and increase environmental awareness by addressing similar areas in large projections. The Kızılırmak River, originating from the Kızıldag slopes in the İmranlı district of Sivas province and passing through the Çorum province before reaching the Black Sea at Bafra Cape, also harbors alluvial risks and adverse effects. It holds significant importance for energy production with 12 dams and hydroelectric power plants (HES) on the river. Additionally, the Pirinçli Hydroelectric Power Plant, with a transmission structure of 13,756 meters between Dodurga district of Çorum province and Güvercinlik and Kumbaba Villages, plays a vital role in electricity production in the region. The Pirinçli HES is located downstream of the Obruk Dam constructed by the State Hydraulic Works (D.S.I.) on the Kızılırmak River. It is known that a significant portion of the sediment accumulation between Güvercinlik Dam and Kumbaba Dam occurred before the construction of the Obruk Dam. Hence, preventing risks that could lead to environmental adversities is of paramount importance. In this study, a combined fieldwork was conducted using different methods to determine the areas where sediments accumulated and the alluvial material being transported cuts off the flow velocity of the Kızılırmak River and causes accumulations between the Güvercinlik Dam and Kumbaba Dam. For this purpose, terrestrial measurements, photogrammetric and remote sensing methods were combined and evaluated together to ensure the integrity of the obtained data.

STATIONARY MODE OF FLUID FLOW IN THE PIPELINE IN THE PRESENCE OF ASSOCIATED SAMPLING AND PUMPING

Pipeline transportation of oil and petroleum products plays a significant role in the transport system of the Russian Federation. When operating oil pipelines, reliability and energy efficiency are the most important criteria. To achieve these indicators, it is necessary to perform optimal technological modes. When constructing models of technological regimes, a methodology is used in which the movement of oil and petroleum products is considered as steady. Based on this assumption, the throughput, pump operating modes, strength characteristics and other parameters are determined. During the operation of the equipment, almost every day it is necessary to switch from one mode to another, which entails unsteady fluid movement for some time. At the same time, the unsteady mode makes up a small part of the total operating time of the system.The beginning of studies of unsteady fluid processes in pipes dates back to the last quarter of the 19th century. N. E. Zhukovsky made a fundamental contribution to the study of this problem. His classic work on water hammer in water pipes was the beginning for the creation of a large number of works in pipe hydraulics. The problem was solved for an ideal elastic fluid, i.e. without taking into account the friction forces against the pipe walls. The resulting formula, according to which the pressure increment is proportional to the velocity, has received numerous experimental confirmations for cases when it is possible to neglect pressure losses to overcome hydraulic resistances. N. E. Zhukovsky also obtained a formula for determining the sound velocity of a liquid droplet in a pipe with elastic walls. It is proved that this speed depends on the pipe material and its thickness.In the future, a large number of works were carried out to study the flow of liquid and gas in round pipes. The fundamental works of I. A. Charny, who obtained a mathematical model in the form of a system of partial differential equations of hyperbolic type, proved fruitful in this direction. Linearization of the equation, taking into account viscosity and hydraulic resistance allowed the researcher to obtain solutions to a number of engineering problems.The introduction of the Dirac function in the description of selectionpumping at specified points made it possible to describe processes in complex pipelines with one partial differential equation.This article discusses a horizontal section of the pipeline with sampling and pumping points. A stationary process for a drip liquid is considered. The problem is solved using the sine-Fourier transform.

Triangle from the Past: A Late Ottoman measuring instrument

In this study, we present an unusual instrument that is rarely seen in museum collections. This richly decorated brass triangle belongs to a group of objects used by Ottoman architects and engineers. The level or havāyī terāzū is an instrument that has a wide application in geometry, architecture, military engineering, hydraulic works, and topography. With its rich decoration, it can certainly be seen as a work of applied art and an artifact that – alongside its functional role – also has a symbolic value. Dating of the level is possible based on comparisons with other finds, especially those from the collections of the Pera Museum in Istanbul and the Petrovic Collection at the Canada Science and Technology Museum in Ottawa. However, the level from the Museum in Doboj is significant because it was cast in a form that is unique among levels known to date. Detailed descriptions of the instrument can be found in medieval Persian and Arabic treatises, later Ottoman studies, and Renaissance European publications. Finally, this study provides an opportunity for the wider public to learn about a lesser-known artifact, and to encourage the publication of similarly little-known ones.

STUDY ON THE TROPICAL-STORM-GENERATED WAVE FIELD ON THE SEA AREA AROUND LY SON ISLAND

Ly Son is a frontline island of our country that is often affected by adverse weather conditions such as monsoons or tropical storms. Studying the hydraulic parameters of tropical storms, including the storm's wave field, to determine extreme conditions plays an important role in forecasting, planning and construction of hydraulic works. The author uses the two-dimensional wave propagation model MIKE 21 SW to simulate the wave field of Molave storm 2020 in Ly Son sea. The results show a good agreement between the values obtained from the model and the actual measurements at Ly Son station. Based on the results obtained, the author proposes a method to simulate storm wave fields that is relatively accurate and effective. In particular, current standards based on wind speed and wind fetch still have many limitations. This is valuable in the actual design and planning of hydraulic works.

Management of an urban lagoon. Study case: Ilusiones Lagoon, Tabasco, Mexico

As a delta, Tabasco, located in the Mexican southeast, is susceptible to flooding. The city of Villahermosa, the capital of Tabasco, is not an exception. The most recent event occurred in November 2020, when an excess of rain provoked an urban lagoon to exceed its levels. The lagoon discharges at a river by a diversion channel controlled by a culvert. To analyze it, a hydraulic model -HEC RAS V6.0- was used. Precipitation, flow, and level data recorded during 2020 were used to simulate four scenarios: I) one culvert of 1.5 m x 1.75 m (current situation); II) three culverts of 1.5 m x 1.75 m; III) three culverts of 2 m x 2.5 m; and IV) one culvert of 10 m x 2.5 m. The dimensions of the culverts were subject to the available physical space of the discharge channel. It was found that the best performance was achieved with scenario II. This result is contrasting because this alternative is not the largest as might be expected; it is also encouraging because it improves the performance of this lagoon. With this proposal, we reduce the damage by 75.31%, which means 296 homes are protected. Finally, the proposed methodology can guide designers and decision-makers to evaluate hydraulic works in urban lagoons like those presented in this work.

PERANCANGAN SISTEM HIDROLIK PADA PINTU WINGBOX BERKAPASITAS 2 TON

Currently, many innovations are being made in developing a technology to facilitate human work. One of these technologies is the hydraulic cylinder. Hydraulic cylinders were created to facilitate human work, especially in the industrial sector. Hydraulic cylinder, using a liquid or so-called liquid fluid, to be able to make the hydraulic cylinder work. In the hydraulic cylinder components, there are cylinder axles, pistons and cover seals. In general, hydraulic cylinders can be used for wingboxes. A wingbox is a box on a truck, which can be opened from the side with the help of a hydraulic cylinder. This journal was created to study how the simulation of hydraulic cylinder components when working. The design method used is the reverse engineering method, where the components that have been designed are then simulation is made to find out how strong the component is in holding the load when the component is working. The simulation is carried out using the Autodesk Fusion 360 application to find out how strong the hydraulic cylinder works in bearing the load. The results of this method are obtained when the simulation results of the hydraulic cylinder have been obtained.

The current state of the Southern Bug River mouth ecosystem

The article considers the pre-war conditions main components of the Southern Bug mouth ecosystem. The results of sediments samples study have shown transformation of lagoonal accumulation, appearance of reducing condition spots in sediments, presence of exceeding MAP for lead. An estuarine water analysis given an idea about hydrochemical features mouth section of river, namely: high concentration of suspended solids – on an average 11,4 mg/dm3; increasable concentration BOD5 – an indicator of easily oxidized organic substances content; periodic significant exceeding MAC of ammonium and nitrite nitrogen. Hydrobiological changes primarily concern a decrease in primary productivity due to a decline in phytoplankton biodiversity; there was also a reduction of zooplankton. The current state of the Southern Bug River mouth ecosystem is formed predominantly under the periodic dredging of shipping channels followed by the formation silt dumps. The post-war revitalization of the Southern Bug estuary ecosystem should include measures to mitigate the negative effects of anthropogenic activity especially the consequences of hydraulic engineering works.

ICOLD 2023, Gothenburg Sweden: Turkish experience of the February 2023 seismic event

This technical briefing provides a summary of the findings and assessments presented by the DSI (State Hydraulic Works, Türkiye) team during the ICOLD 2023 meeting regarding the performance of embankment dams during the seismic events that occurred in February 2023. Two powerful earthquakes with moment magnitudes (Mw) initially estimated to be between 7.5 and 7.8 struck the eastern Anatolian Fault Line, impacting several embankment dams in the region. The seismic activity resulted in significant lateral displacements, settlements and cracks in the embankment dams structures. For the first earthquake, peak acceleration recorded at the nearest station (TK4614 – Pazarcik) was 2.21g, for the second earthquake, the peak acceleration recorded at the nearest station (TK4612 – Goksun) was 0.59g. The presentation at the conference, as reported here, provided valuable insights into the performance of the embankment dams during and after earthquakes.

Rainfall intensity model with spatialization of intensity-duration-frequency curve parameters - A case study for the state of Maranhão, Brazil

The characterization of intense rainfall in engineering projects is fundamental, mainly regarding the estimate of design flows necessary for designing hydraulic works. Intense rainfall events are commonly measured by Equations and curves that relate their intensity, duration, and frequency. Such relations, known as IDF, enable the hydrological characterization of a given region. This article presents a methodological design and results from both determination and spatialization of IDF curve parameters for the state of Maranhão. Historical series of maximum daily rainfalls obtained from National Water and Sanitation Agency (ANA) were used in 126 rainfall gauge stations and the Gumbel probability distribution estimated the maximum daily rainfall for 5, 10, 15, 25, 50, and 100 return periods. The Isozonal Method obtained the IDF correlations of intense rainfall events for 0,1. 1, and 24 h durations, and their performance were conducted by Nash-Sutcliffe R2 coefficient and Root Mean Square Relative Error (RMSE). “K, a, b, and c” parameters of intense rainfall equations were determined by optimization and convergence processes and their spatialization was carried out by interpolation by Inverse Distance Weighted (IDW), which enabled to determine the values of each parameter in regions without physical measurements of rainfall. Similarly, rainfall intensity was spatialized for the entire state. According to the results, the rainfall distribution in the state of Maranhão shows a variation in the indexes of precipitation, with the highest values found in areas located in central-southern, southwestern, and southeastern regions.

Зарослевые экосистемы Невской губы: реакция на гидростроительство

The first stage results (2016–2020) of the scientific research programme of macrophyte thickets ecosystems (socalled “reed beds”) in the Neva Bay of the Gulf of Finland have been summed up. The programme is carried out by the environmental design company “Eco-Express-Service” LLC (initiator, coordinator, sponsor and main executor) with the participation of a group of St. Petersburg biologists. Observations are carried out at 16 model parcels of thickets (the area of each plot is about 1 km2 ). Maps of phytocenoses, fish spawning places, migratory stopovers for aquatic and semiaquatic birds, as well as summary maps of the resulting ecological value were compiled. According to main indicators, the macrophyte thickets ecosystems that have appeared before and during Saint Petersburg Flood Prevention Facility complex construction (1979–2011) turned out to be the most environmentally valuable. The last ones have some advantages, since they are still less dense, more mosaic, and therefore available for fish and birds settlement not only along the periphery of plant massifs, but also inside them. Younger thickets that have appeared in new biotopes in the past decade are much less actively used by the biota, but they represent a valuable reserve for future macrophyte thickets ecosystems. The sensitivity of macrophyte thickets to hydraulic works and their consequences increases with the age of thickets: the youngest ecosystems formed under the conditions of technogenic impact are the most resistant. On the whole, it should be noted that macrophyte thickets are highly resistant to hydraulic works, except their direct mechanical destroying. The projective cover degree of biotopes by vegetation depend much less on the ongoing hydraulic works, than on the general trend of its technogenic succession.

Examining the open-source datasets for water quantity and quality using the soil and water assessment tool (SWAT).

Water quality modeling is very important for the management of water resources. In this study, the upper part of the Porsuk Basin in Türkiye is analyzed using SWAT. In the analysis, in addition to the data provided by the General Directorate of State Hydraulic Works (DSI), the freely available flow and water quality data from the GEMStat data portal were used. This study presents a discussion of the practicality of GEMStat data for a water quality model. For this purpose, firstly, the SWAT model was constructed with freely available global data sources on elevation, land use/land cover, and soil type. Then, the model flow outputs were calibrated and validated for both DSI and GEMStat data in three different time periods. As a result, the flow calibration and validation success in the daily time step is 0.64 and 0.44 according to the Nash-Sutcliffe efficiency (NSE). The model was also validated using GEMStat flow data and calibrated using GEMStat water quality data such as nitrate (NO3), total suspended solids (TSS), and dissolved oxygen (DO) with a reasonable value. Hence, the results showed that GEMStat flow and water quality data can be used as auxiliary open-source data in the modeling process.

Effects of Communication for Better Vegetable Production in Burkina Faso: Case of the Agricultural Plain of Mogtedo in the Province of Ganzourgou in the Central Plateau Region

Vegetable production is the main activity directly linked to the impounding of the dam, its storage, its sustainable conservation for different uses. The article aims to be a support and reinforcement framework for aspects of communication and behavior change for the sustainable development of our off-season production in rural areas. Thus, communication can constitute strategies in the mobilization of water resources for a better consideration of the management of hydraulic works for a better market gardening production in the commune of Mogtédo and Zam. Is communication a tool for better vegetable production? In this study the main objective is to analyze the effects of communication for better market gardening production around the agricultural plain of Mogtédo in the province of Ganzourgou in the Central Plateau region. To do this, quantitative and qualitative methods were used for the collection, processing and analysis of data using appropriate tools.

Hemodynamic effects of a dielectric elastomer augmented aorta on aortic wave intensity: An in-vivo study

Dielectric elastomer actuator augmented aorta (DEA) represents a novel approach with high potential for assisting a failing heart. The soft tubular device replaces a section of the aorta and increases its diameter when activated. The hemodynamic interaction between the DEA and the left ventricle (LV) has not been investigated with wave intensity (WI) analysis before. The objective of this study is to investigate the hemodynamic effects of the DEA on the aortic WI pattern. WI was calculated from aortic pressure and flow measured in-vivo in the descending aorta of two pigs implanted with DEAs. The DEAs were tested for different actuation phase shifts (PS). The DEA generated two decompression waves (traveling upstream and downstream of the device) at activation followed by two compression waves at deactivation. Depending on the PS, the end-diastolic pressure (EDP) decreased by 7% (or increased by 5–6%). The average early diastolic pressure augmentation (Pdia¯) increased by 2% (or decreased by 2–3%). The hydraulic work (WH) measured in the aorta decreased by 2% (or increased by 5%). The DEA-generated waves interfered with the LV-generated waves, and the timing of the waves affected the hemodynamic effect of the device. For the best actuation timing the upstream decompression wave arrived just before aortic valve opening and the upstream compression wave arrived just before aortic valve closure leading to a decreased EDP, an increased Pdia¯ and a reduced.WH.

Research on reducing flow shock of the digital hydraulic wind turbine

The wind turbine with digital hydraulic transmission can make the corresponding hydraulic pump work according to the wind speed, so that the hydraulic wind turbine can maintain high efficiency at the whole working wind speed. However, the switching of different displacement hydraulic pumps will cause a large flow impact on the hydraulic system of the wind turbine, affecting its working characteristics and the absorption of wind energy. Based on the analysis of the working principle of the digital hydraulic wind turbine, the scheme of a 5 MW wind turbine is designed and the AMESim model is established. The dynamic characteristics of the digital hydraulic wind turbine under two switching modes are compared. An advance valve closing control strategy is proposed to reduce the instantaneous flow impact. Simulation results show that the control strategy diminished the system flow shock by about 50% when switching the hydraulic pump. Finally, a hardware-in-loop system with a 5.5 kW digital hydraulic turbine is built to verify the effectiveness of the proposed control strategy. The research results provide a theoretical basis and technical reference for the efficient utilization of wind energy and stable operation of the digital hydraulic wind turbines.

Historical comparison of the damage caused by the propagation of a dam break wave in a pre-alpine valley

Study regionValle Camonica basin and Lake Iseo in the Italian pre-alpine and alpine region. Study focusThis paper provides the first hydraulic reconstruction of the terminal part of the Gleno dam break with the propagation of the flood wave along a wide pre-alpine valley. The reconstruction of this part of the event, accomplished with a new 2D Shallow Water Equations solver, provides the occasion to tackle some important issues related to the computation of flood damage, a topic of paramount practical importance for which there is no widely accepted procedure in the literature. New hydrological insights for the regionThe hydraulic reconstruction provides insights into the propagation of the flood through the floodplain as far as the inlet of Lake Iseo. A methodology for damage computation is presented that considers a physically based criterion for the vulnerability of human life, with significant implications with respect to the use of simpler approaches based only on the density of the population. The economic evaluation of the damage to the built environment and to agricultural activities is included through a comprehensive recent approach. We discuss the variations of the expected damage due to the hydraulic works accomplished over the last 100 years to decrease the flood hazard, showing that its reduction has been followed by an increase in the expected damage in the surrounding areas.

Aplicación de Redes Neuronales Artificiales a la modelación de lluvia-escorrentía en la cuenca del río Chancay Lambayeque

Between the months of December to April, regions of northern Peru, including Lambayeque, are affected by maximum extreme events, wreaking havoc on homes, flooding crop fields, collapsing hydraulic works, and the most irreparable loss of human lives. In this line, the objective of this research was to apply Artificial Neural Networks to rain-runoff modeling in a basin in northern Peru, namely, the Chancay Lambayeque river basin belonging to the Pacific slope. For this purpose, records of precipitation and flows of 30 years (hydrological normal) were collected from 12 hydrometeorological stations belonging to the basin and neighboring it. Thus, applying a model of Long and Short Term Memory Networks (LSTM) we proceeded to model the rain, seeking to follow the behavior of the flows observed in the Racarrumi hydrometric station, with 80% of the information the model was trained and with 20% it was validated. In short, it was obtained that in the modeling validation stage, the Nash coefficient was 0.93, corresponding to the qualifier "very good".

Sensitivity Analysis of Geomechanics Influence on The Success of Hydraulic Fracturing in Shale Gas Reservoir

Shale gas has a permeability of <0.1 mD and a porosity of around 2% - 8% to produce gas that rises to the surface through hydraulic fracturing and horizontal drilling. Geomechanics is one of the important factors that influence the success of a hydraulic fracturing job. Technology in fractures makes geomechanics a clear factor in predicting the success or failure of rocks in deformation and knowing the properties that will be faced by fracture fluids which will later be used to see the effectiveness of fracture fluids in resisting fractures. High operational costs need to be studied further to determine the parameters that affect hydraulic fracturing work, especially from the geomechanical aspect to minimize production failures and work safety. The research conducted this time focuses on the sensitivity of geomechanical parameters by using CMG (GEM) reservoir simulations for reservoir models and conducting Response Surface Methodology (RSM) in selection and ease when applied in the field prior to the hydraulic fracturing process. In this sensitivity study carried out on 5 parameters namely stress, Poisson's ratio, Young's modulus, biot coefficient, and pore pressure. The geomechanical parameter that has the most influence on hydraulic fracturing work based on the sensitivity results carried out through 500 data sets using the Analysis of Variance obtained R2 = 0.99 with the results based on the importance value of the pore pressure variable of 3.8. Then Young's modulus is 0.28, stress is 0.12, Poisson's ratio is 0.08, and biot coefficient is 0.04.

Constrained river, constrained choices: seasonal floods and colonial authority in the Red River Delta

AbstractThis article examines the problem of flooding in colonial Tonkin through two interrelated lenses: the history of disasters as social and political phenomena, and the history of technology and the constraints that shape its use. With a gradient ten times steeper than the Mekong, the Red River (Sông Cáiin Vietnamese) is notorious for its huge seasonal fluctuations and violent floods. For centuries, local rulers and cultivators constructed dikes to protect fields and settlements, though breaches and inundations were frequent. French administrators were convinced that they could improve the flooding situation with modern know-how. From the 1890s, colonial engineers carefully studied the river's behavior, examined a range of different schemes to control it, and debated the extent to which the straitjacketing of the river might gradually exacerbate flood risk. Despite their deep-seated misgivings about the problems caused by dikes, they were ultimately forced to work within the parameters of pre-colonial hydraulic works. The result was an intensification of existing dependencies and flood vulnerabilities, which finally came to a head under the combined pressures of extreme weather and war, and which ultimately played an important role in undermining colonial authority in the Red River delta.

Investigating the Reliability of Stationary Design Rainfall in a Mediterranean Region under a Changing Climate

Extreme rainfall events have been more frequent in recent decades, potentially as a climate change effect. This has been leading to a higher risk of the failure of existing hydraulic infrastructures, and to a higher awareness regarding the unreliability of design rainfall calculated with reference to historical data recorded in the last century. With this in mind, the present study questions the stationary assumption of the rainfall Depth–Duration–Frequency curves commonly used in Sicily, the biggest island of the Mediterranean Sea. Quantiles derived from the most up-to-date regional method, regarding Sicily, based on observations in the period 1928–2010, have been compared with those extracted from a high-resolution dataset related to the period 2002–2022, provided by the SIAS agency. The results showed a remarkable underestimation of the rainfall quantiles calculated with the regional approach, especially at the shortest durations and low return periods. This means that new hydraulic works should be designed with reference to longer return periods than in the recent past, and those that currently exist may experience a higher risk of failure. Future investigation of this aspect is crucial for enhancing the effectiveness of water management and detecting hydrological risks under a changing climate.

Rupestrian Works and Artificial Cavities: Categories of Construction Techniques

Artificial cavities, i.e. man-made structures excavated within rock masses in the mountains, below the ground, or in the subsoil of urban areas, are typically distinguished based upon the epoch of realization and the function for which they were originally used. They can be ranked into the following types, in turn divided in sub-classes: hydraulic works, dwelling works, worship works, war works, mining works, transit way works and others. The above criteria are essential for establishing a general common line aimed at providing optimal elements for cataloguing and comparing subterranean features, which may favor the creation of databases functional to knowledge, protection and enhancement of the hypogean works. In addition, there is another useful aspect for studying the origin and evolution of underground structures that takes into account their implementation modalities. The National Commission on Artificial Cavities of the Italian Speleological Society has identified, according to its experience in the field and in function of the construction techniques, six general categories of underground works: cavities dug in the subsoil, cavities built in the subsoil, cavities obtained by re-cover, anomalous artificial cavities, mixed artificial cavities and natural caves modified by men (anthropized caves). In this contribution we will discuss the specific details of each category, thus extending the concept of rupestrian heritage, usually confined to temples or dwellings carved in the rock, to a culture of building in "negative" that finds larger and more diversified evidences.