Kızıldere geothermal field is located in the Aegean graben systems. The study area comprises Kızılkaya, İğdecik, Sazak, Kolonkaya, and Tosunlar formations consisting of marbles, limestones, conglomerates, sandstones, travertines, and alluviums. The wells were drilled to develop the Kızıldere geothermal field, and the reservoir temperatures in the wells were various between 170 and 212 °C. There are

The mechanized tunnelling process is mainly coupled with precast concrete segments, which include segmental rings that they are placed in their place simultaneously with the boring operation. Segments are mainly loaded by thrust jacks during the installation stage. It is essential to limit the cracks and damages of the segments during this stage to be sure of their structural integrity and sustainability

In this study, the activity concentrations of natural radionuclides in soil and beach sediment samples collected from 15 randomly but uniformly distributed locations in the coastal area of Akwa Ibom (southern Nigeria) were measured using hyper pure germanium (HPGe) detector. The activity concentrations of 238U, 232Th and 40K varied from 9 to 44 Bq/kg, 3 to 72 Bq/kg and 35 to 250 Bq/kg respectively

Groundwater potential (GWP) of an aquifer refers to availability of extractable groundwater resources. GWP of aquifers is commonly estimated in terms of aquifer yield (Y), normalised yield (YN), specific capacity (Sp-C) and productivity (PA). These aquifer parameters have certain advantages and limitations in assessing GWP. Significance of using these parameters as estimators is lying with their ability

The prediction of blasting rock boulder in discontinuous rock is crucial for the optimization of blasting operations. Therefore, it is necessary to understand the role played by the geological features of a rock mass in controlling oversize fragments. This research is the result of coupled use of multivariate analysis methods and geomechanical indexes in order to identify the main rock mass and blast

The practice of oilfield development promotes the development theory, and the breakthrough of development theory brings about the revolution of development technology. Using horizontal wells and volume fracturing technology, volume fracturing has been applied in unconventional reservoir, and the formation mechanism of complex fracture network will bring innovation to development technology. At present

Quaternary coastal sand dunes occur frequently along the Atlantic coast of Morocco and result from the combined effect of river discharge, littoral drift, winds, vegetation, and other meteorological conditions. In this paper, we investigate the textural and compositional parameters of the coastal dune sands of Essaouira across the Ksob riversides, as well as their provenance. Morphologically, they

Estimation of elemental distribution with minimum estimation errors is crucial in mineral exploration. This study aims to estimate Cu, Mo, Ag, and Au distribution in a local scale. To do this, the application of an ordinary kriging–artificial neural network (OK-ANN) model is proposed for elemental distribution based on lithogeochemical data in Kahang porphyry deposit, Central Iran. In addition, ordinary

The assessment of the natural background of the hydrocarbon (HC) concentrations in soils is an urgent task, the solution of which will allow us to objectively determine soil pollution and promptly introduce restrictions on industrial technologies of oil production, transportation, and refining. The purpose of this work is to assess the background content and to establish patterns of accumulation of

In this study, in order to monitor meteorological droughts of the Qazvin station in Iran, drought duration and severity using historical monthly precipitation during 1964–2015 and copula functions is investigated. The characteristics of drought are computed from monthly standardized precipitation index (SPI). Different univariate distributions were fitted to characteristics of drought. According to

In order to solve the problem of serious deformation and damage of surrounding rock under the complex stress environment of gob and residual coal pillar of overlying coal seam in China Coal Tashan Coal Mine, FLAC3D (Fast Lagrangian Analysis of Continua) numerical simulation is used to study the different excavation schemes of the return air chute in the near distance coal seam mining of Tashan Coal

Jinci Spring is a popular karst spring in northern China and has important historical and cultural value. The spring stopped flowing since it first dried up on April 30, 1994, which has resulted in further water deficit in the area. This study aimed to further the sustainable utilization of Jinci Spring and used long-term karst groundwater monitoring data to investigate the causes of the drying up

The gulf of Hammamet (GH) area, located in northeastern offshore Tunisia, experienced several tectonic deformations during the Mesozoic and Cenozoic eras. These deformations generated discontinuities, hiatuses, and thickness variations of sedimentary successions during the late Cretaceous, such as the late Campanian-late Thanetian El Haria Fm, which is documented to be partially or totally eroded in

The objective of this paper is to analyze land use change on Daishan Island using a multi-temporal remote sensing imagery. Four Landsat optical remote sensing images were collected from 1987, 1996, 2007, and 2016, and eight land cover types were recognized and extracted using the collected time series imagery. In addition, a land use-type transfer matrix was used for temporal analysis of land use conditions

Vegetation change has become a worldwide environmental concern. Artificial desert oases in the Northwest China are among the most ecologically sensitive environments and are also a repository of ecosystem services by relying on vegetation system. Over the last four decades, land transformation related to anthropogenic activities and climate change is among the main drivers of changing vegetation cover

In coal reservoirs, coal, gas, and water coexist. Different moisture conditions may cause different gas storage capacity. In this paper, a series of isothermal adsorption experiments were conducted which consider different coal particle sizes, moisture ratios, and gas adsorption pressures. The Dubinin-Astakhov isothermal model is adopted in our simulations, and some adsorption parameters such as capacity

Density is the most important parameter of debris flow. This work looks into the typical debris flow and mountain torrent occurred in Longmen Mountains in the past 20 years and compares the calculation results of the density using various methods. It shows that the mean deviations of result are in the range of 20–30%, and the static model is only suitable to the occurred debris flow event but not the

With the rise of machine learning and artificial intelligence, back propagation (BP) neural network, support vector machine (SVM), random forest model, and others can be used to predict the distribution of groundwater. By using the existing sample data, learning, training, and forecasting for some unknown areas (unmanned areas, areas where people are not easy to reach, etc.) can save costs and improve

In this paper, the propagation mechanism of an oblique straight crack has been studied theoretically, which reveals its mechanical characteristics under in-plane biaxial compression. Firstly, the stress components away from the boundary are derived based on the superposition principle. The normal stress components are strengthened and shear stress component is restrained compared to the uniaxial condition

The rockburst in steeply inclined coal seams (SICSs) is a typical dynamic instability event in coal-rock masses under dynamic and static loads. Existing physical experimental studies mainly investigate the quasi-static failure characteristics of coal-rock masses and lack physical experimental data gathered under applied dynamic loads, thus failing to reveal the full nature of the mechanism driving

Saïss plain contains an important aquifer. This complex groundwater system plays an important socio-economic role. Managing the groundwater resources requests a good understanding of resources availability and human needs satisfaction. These two components are estimated to get annual water balance of Saïss aquifer. Resources availability depends on meteorological parameters (rainfall, wind speed, temperature

The present review of high- and low-temperature minerals demonstrates the value of the pyrometamorphic rocks, altered varicolored marble (cement zones), travertine, and regolith in Jordan as analogues of cementitious repositories. The alkaline leachate contains hazardous elements such as Zn, Cd, Fe, Ni, Cu, V, Cr, Fe, Mo, As, Co, U, etc. The sites offer a good chance to investigate the interaction

In the environment of deep earth, the “locked-in” stress is widely distributed and considered to be the main cause of rock engineering disaster. But when the rock sample is brought back to the laboratory from deep rock mass of high stress, temperature, and hydraulic pressure, the locked-in stress is dissipated over time. In this paper, similar materials are used to simulate the locked-in stress in

The spontaneous combustion of coals is a natural phenomenon that causes serious losses in the mining sector as well as environmental problems as a result of greenhouse gases released during spontaneous combustion of coal. In this study, for the first time, the effect of coal reactor size on the spontaneous combustion tendency parameters (crossing point temperature (CPT), average heating rate (AHR)

Landslides are one of the most destructive natural hazards in Turkey. In addition to loss of lives, there were many negative impacts of landslides on properties and the environment. To minimize the losses and damages related to landslides, a series of labour-intensive studies starting from landslide inventory to landslide risk mapping is required. Thus, this study aims to assess the landslide risk

The Neoproterozoic Abu Dahr ophiolitic massif (~ 280 km2) in the South Eastern Desert of Egypt is one of the largest ophiolitic nappes in Egypt. Since in the early twentieth century, this nappe was the main source for chromitite, along with, magnesite, and asbestos (chrysotile and tremolite). In this study, we investigate the efficiency of using the Advanced Spaceborne Thermal Emission and Reflection

The lack of efficient access and query method remains a barrier for three-dimensional (3D) geological tetrahedral models (GTMs) to support high-performance 3D spatial analysis and calculation. To organize and manage GTMs efficiently, this paper proposes a GTM-oriented hybrid spatial indexing structure, named 3DOR*-tree, which can fully exploit the advantages of the fast spatial partition of Octree

As a high-efficiency and environment-friendly stabilizer material, ionic soil stabilizer (ISS) has been widely used in construction industries. However, the microstructure characteristics and mechanical behavior of the treated soil still need a case study based on vary characteristics of soils and different treatments. In this paper, microscopic and macroscopic testing methods were adopted to explore

To facilitate scientific decision-making and geohazard prevention and mitigation during the construction and operation of an electricity transmission line projects in Tibet, China, this paper used remote sensing (RS) and geographic information system (GIS) technologies to semi-automatically extract potential geohazards along this line which pose threats to the transmission towers from the perspective

The geothermal field of Suli and Tulehu is located in the eastern part of the Ambon Island, administratively situated in central Maluku regency, Maluku province, Indonesia. In the year 2017, the measurement of the Earth’s gravity and magnetic field has been done to evaluate the geothermal system in Suli and Tulehu. The application of gravity and magnetic methods was applied to determine the subsurface

Multicrystalline silicon is widely used in solar cell production. Silicon nitride is commonly applied as a coating material for the silica crucibles utilized for the growth of multicrystalline silicon by directional solidification. In this work, we will study the effect of the sintering temperature of the Si3N4 coating applied to the photovoltaic solar crucible on the adhesion strength of the Si3N4

With the rapid development of land reclamation, a great amount of buildings are constructed on degree fill. Negative skin friction (NSF) caused by the self-consolidation of dredger fill has a significant influence on the stability of construction. Therefore, centrifuge model tests were conducted to investigate the influence of dredger fills thickness, pile top load, and piles radius on the self-consolidation

Evapotranspiration after precipitation is a major component of the hydrological cycle that has widely been studied both theoretically and experimentally including hydrological balance, design and management of irrigation systems, agricultural productivity, irrigation, drainage planning, and estimation of plant water requirements and environment. The rate of evapotranspiration is directly related to

Locating the horizontal boundaries of magnetic and gravity sources provides a fundamental tool for interpreting geological structures. Many filters for detecting the source boundaries have been proposed. These filters are generally constructed based on vertical and horizontal gradients of the magnetic and gravity data. This paper presents a comparative study of various boundary detection filters such

In this study, a generalized extreme value (GEV) distribution–based statistical model has been developed and proposed to simulate historical and future precipitation extremes in the Xin’an River basin, and the vertical mixed runoff model was driven by future precipitation extremes to simulate the hydrological response to extreme flood events. An adaptive flood control operation model has been established

Tremendous losses and threaten traffic safety were caused by ground fissures as it covers over half of the area of Xi’an, in China. This study summarizes the formation of ground fissures and found that variations in the dip angles and cross angles influence road deformation and cracking. Based on survey data, numerical simulation using MSC.MARC finite element software was conducted to analyze the impact

This study is carried out to assess the water pollution in Köyceğiz-Dalyan Coastal Lagoon Watershed located near the Mediterranean Sea in Muğla province, SW Turkey, by using heavy metal pollution index (HPI). A total of 30 samples were collected from the lakes, streams, groundwaters, the subaqueous hot and cold springs, and on-land hot springs, and Cr, Fe, As, Sb, and Pb concentrations were determined

The mechanical properties of soft soils were investigated through triaxial lateral unloading tests under different initial excess pore water pressures and confining pressures. The lateral unloading stress–strain, strength parameters, and initial unloading moduli of soft soils are presented and discussed in this study. The results show that soft soils abruptly undergo unloading failure. The lower confining

In 1939, Ghana experienced its severest earthquake with a local magnitude of 6.5. It resulted in the death of 17 people and caused significant damage to property. Since then, there have been reported occurrences of earthquakes, though the region is generally considered a stable continental area with few active tectonic features. This seismic region is generally characterized by a major active fault

The Mahelma fault, located upon the Sahel anticline at the tip of the major Sahel fault, is often suspected to be a secondary structure. Yet, to date, the Mahelma fault has displayed no definitive evidences for faulting activity and no unambiguous typology. This paper reviews new data, especially geological and subsurface data, acquired through the Algiers west microzoning project. The data indicate

Due to releasing large amount of greenhouse gases in the atmosphere, some countries were committed to control the expansion of these gases into the environment. The best way to solve this issue is carbon capturing and sequestration (CCS). Injection of CO2 into the depleted reservoirs is one of the most favorite recommended solutions. Iran contains variety of depleted reservoirs. This makes good opportunity

Geological probability calculation was applied to the Northern Croatian Neogene deposits in the western Sava Depression. Structures “A” and “B” (with sandstone hydrocarbon reservoirs inside the Kloštar Ivanić Formation, Upper Miocene) were analyzed using two different Probability of Success (POS) methodologies. The classical POS approach showed that, in such play and wider areas of selected two structures

The traditional interpretation of a legendary, though controversial, fourth century text of Ammianus Marcellinus is that an earthquake-generated tsunami hit Alexandria on 21 July 365. The causative earthquake is usually associated with the Aegean Arc, and it has been modeled through elastic dislocation of the up to 9 m uplift of Crete which occurred in ca. 365. A rather steep, intra-plate fault was

The mining work in high-density coal mining areas has gradually extended to deep strata, and 3D seismic exploration technology plays a key role in the exploration of deep coal resources. Collecting high-quality 3D seismic exploration signals is the prerequisite for accurate analysis of deep coal distribution. Taking the L-city high-density coal mining area as the study area, the arrangement position

Forest fires cause a lot of damage in Turkey, due to the geographical location, high temperatures, and low humidity levels. Accurate determination of burned forest areas is crucial for correct damage assessment studies, fire risk calculations, and review of the forest regeneration processes. In this study, we compare the performances of unsupervised classification methods (which have not been used

Gheshlagh-Aftabrow granodiorite (GAG) is emplaced within Eocene volcanic rocks in the central part of the Urumieh-Dokhtar magmatic belt (UDMB) of Iran and comprises of host granodiorites and associated mafic microgranular enclaves (MMEs). The Al-in-hornblende barometry and the amphibole–plagioclase thermometer are applied to calculate pressure and temperature. The host granodiorite yields crystallization

The effects on geotechnical properties of rock mass from the constituent particle morphology have been acknowledged since long. Particle morphology is among the most important parameters affecting the mechanical characteristics of rock, such as shear strength, cohesion, friction angle, porosity, groundwater seepage, and angle of repose. This review summarizes the current advancement in numerical simulation-related

Karst aquifers supply an important freshwater resource for MENA (Middle East and North Africa) semi-arid regions. Their functioning conditions reveal often several contaminations. The Cheria carbonate aquifer (NE Algeria) has never had management tools to deal with the pollution of this resource. The outlining and protection of the vulnerable areas are essential to ensure the water purity and the consumer

The original version of this paper was published with error. Figure 3 were corrected into Figs. 3 and 4, but the old titles were used for these two figures and the updated captions which author sent in the last modification of the images were not used. Given in this article are the correct captions.

In general, agricultural intensification and human intervention lead to the soil erosion problem. Remarkably, marginal alluvial plains of vast Indo-Gangetic plain consistently suffer a great peril of land degradation in and around the Yamuna-Chambal valley. This is probably due to the geologic evolution of the landscape. Geomorphology and the land forms developed in and around the studied countryside

During recent decades, fiber-reinforced polymers have been widely used as an alternative to steel in different engineering fields. The purpose of the current paper is to simulate nail-grout interface in soil-nail systems and to evaluate glass-fiber-reinforced polymers nail as an alternative for conventional steel nails. Although numerous studies have been performed on pullout behavior and creep tests

In the present study, we analyzed spatio-temporal vegetation dynamics to identify and delineate the vegetation stress zones in tropical arid ecosystem of Anantapuramu district, Andhra Pradesh, India, using Normalized Difference Vegetation Index (NDVI), Vegetation Condition Index (VCI), and Vegetation Anomaly Index (VAI) derived from time-series Moderate Resolution Imaging Spectroradiometer (MODIS)

One of Egypt’s major environmental issues is the disposal of solid waste. Natural clay is commonly employed to produce impermeable liners in solid waste landfills. Leachate from the waste mass can significantly affect the geotechnical properties of clay liners. In this study, the impact of hazardous industrial solid waste leachate (HISWL) on the geotechnical properties of clayey soil was investigated

Groundwater is the most important natural resource around the world which needs new and advanced technologies for control and monitoring. This investigation was to check the groundwater potential zones by integrated techniques of geoinformatics and geophysical investigation through a vertical electrical sounding in Rawalakot, Azad Kashmir, Pakistan. The study area being a sedimentary basin, sandstone

The plant landscape of Yunlong Lake wetland park in Xuzhou city was studied in this paper, 57 plant landscape photos were evaluated with SBE (scenic beauty evaluation) method, and the factors affecting the scenic beauty were analyzed. The results showed that (1) there was significant correlation between different evaluation groups on the scenic beauty of plant landscape; however, the convergence of

The present study aims to explore the spatial distribution and trends in rainfall, its seasonality and erosivity between 1971 and 2015 over the Suketi river catchment of lower Himachal Himalayas in India. Daily rainfall recorded at three stations in the catchment have been used for the computation of rainfall seasonality and erosivity by employing non-parametric indices say seasonality index, precipitation

Remote sensing (RS) and geographical information system (GIS) have a wide range of applications in groundwater assessment, exploration, and resource management. Several other types of research targeting the water quality assessment in the study area have been done. However, the present work is the first attempt to delineate the groundwater potential zone using a different approach. This paper finds

The Standardized Precipitation Index (SPI) is a powerful tool, requiring only precipitation data for calculating the intensity, duration, magnitude, severity and frequency of drought. Moreover, it provides helpful coverage of drought impacts on multi time scales. In this study, the SPI technique was applied to the dataset of 30 years (1986–2015) to detect drought condition in Northern Pakistan, which

The high degree of nonlinearity in the analysis of hydrologic systems demonstrates that artificial neural networks are suitable methods for this purpose. Artificial neural networks and passive microwave imagery have been combined for monitoring snow parameters, particularly in arid and semi-arid areas where the hydrologic process of the water basin is very dependent on the snow conditions (snow depth

Tourmaline deposit in Sikait area (Southern Eastern Desert of Egypt [SEDE]) is closely associated with metapelitic schistose rocks that belong to Neoproterozoic time. The distribution of tourmaline was mostly controlled by Nugrus shearing, along with schist leucocratic rock varieties (leucogranite, pegmatite, and aplite dikes), which are syntectonically dissected by hydrothermal quartz veins. Local