The aim of the research was to assess the impact of root exudates of two widely distributed plant species, monocot (couch grass) and dicot (dandelion) on the concentrations of 27 macro- and trace elements in the rhizosphere soil of the plants. A field trial was carried out to study short-term variations in the concentrations of the elements when the plants grew separately or in close proximity to each

The Neoproterozoic basement complex of the western segment of the Allaqi Shear Zone (ASZ) in the extreme southern part of the Egyptian Nubian Shield comprises four main lithologic units: gneisses, amphibolites, island arc metasediments, and intrusives. In the present study, these units investigated at the outcrop scale, as well as petrographically and geochemically. Gneisses are subdivided into three

Urban runoff is an effective alternative water resource, particularly in arid and semi-arid regions. Urban runoff exploitation permits cities to have a significant amount of water, but without assessing the runoff quality, harvesting of this resource is complicated and requires further investigations. Due to the lack of a specific method, in this study, a new index method (WLTR) was developed for assessing

Change point detection and trend analysis are the adopted techniques of time series analysis. We have applied non-parametric methods on the temporal and spatial-scale data of 115 years between 1901 and 2015 from ten different federal states in the north and the northwestern India to examine the change points as well as to estimate the future scenarios by examining the past trends. The change points

Using experimental data of near-bed suspended sediment concentrations at five typical hydrometric stations of the Three Gorges Reservoir at the early reserving stage, the differences were investigated between the common method and improved method during flood seasons and non-flood seasons. The impact of taking measurements below 0.2 times the water depth on the results was discussed. The results show

Sawability of diamond wire saw is a cost-sensitive parameter in natural stone quarries that affects directly the production planning and equipment selection. The present study intended to investigate the effect of rock properties on sawability of diamond wire saw in granite quarries by considering the cutting rate and unit wear as the main sawability criteria. Hourly cutting rate of stone and unit

Bisphenols (BPs), which act as endocrine disruptors, are extensively used in epoxy resin and polycarbonate plastic production and are found in various environmental media. This study investigated the occurrence and distribution of seven BPs in water and sediment samples from the Lanzhou section of the Yellow River, China. Previous studies have focused on the southern and more developed regions in China

A comprehensive petrophysical study of the Upper Qishn Clastic Member reservoir was conducted at Tawila oilfield in Yemen. An integrated well-logging dataset was analyzed to detect the reservoir properties and hydrocarbon potential. Lithologic data, shale/matrix models, elastic, seismo-facies, and fluid analytical analyses and crossplots were generated to characterize the reservoir. The clastic reservoir

Dustfall samples from the western Chinese Loess Plateau (CLP) were collected from 2013 to 2016 at Jiuzhoutai for dustfall variation analysis. Results showed that the seasonal dustfall variations were non-significant in the region, indicating dustfall sources with inconsistent patterns largely contributed to the modern loess formation. The average rate of loess accumulation was approximately 0.34 mm/year

In loose or highly weathered rock slopes, the circular shear failure mechanism occurs in large scale. Most rock slope stability investigations ignore the influence of geometric parameters, i.e., failure surface entry point distance (le). This study presents failure surface determination based on constant element stress-based method. The failure surfaces and their sliding mechanism are analyzed first

In order to provide an effective theoretical basis for the location of microseismic source, active seismic exploration technology, and internal medium structure inversion of coal mine in different areas, we analyze the propagation law of microseismic wave in different medium accurately and intuitively. In this paper, we first studied the finite difference method suitable for the analysis of wave field

Visco-elastic response of combined footings lying on earth beds with geocell-geomembrane inclusions has been studied using a simple lumped parameter model. The earth bed has been simulated with the help of series of Burgers model, i.e., Maxwell and Kelvin models coupled in series, connected by an elastic member. Overlying the soft visco-elastic bed, there exists a geocell layer with soil infill idealized

Although numerous studies have been done on the Alborz Mountains, few have examined Quaternary events based on alluvial fans which are located in front of the southern limb of the Central and Eastern Alborz Mountains. This study analyzed the morphometric indexes for 131 alluvial fans (three generations) in the Eyvanekey, Garmsar, and Semnan areas (As, WLF, Bull, Fa, Fs, Fg, Fc, R) as well as for basins

Lack of strategic planning in the mining and mineral industry (MMI) of Pakistan remains the core issue impeding the development of the industry. This study proposes and, respectively, prioritizes future strategies based on strengths–weaknesses–opportunities–threats (SWOT) analysis. The proposed strategies aim to foster the sustainable development of the MMI. An integrated approach is introduced to

El-Qaa plain in the South Sinai is one of Egypt’s promising regions for sustainable development. The groundwater forms the primary sources of development in this region. The present study aims to identify the groundwater resources in El-Qaa plain area, Southern Sinai, Egypt. ASTER-TIR indices (Carbonate Index, Quartz Index, and Mafic Index) combined for the first ones with geophysical and geospatial

The Shahejie Formation in Huimin Sag is an important crude oil/natural gas reservoir stratum. The results show that (1) in the study area, the Sr/Ba value of Shahejie Formation ES4, ES3, and ES2 in Huimin Sag is 0.55–0.58, showing that these were freshwater-brackish water environment with a continental deposition; the average Sr/Ba value of the first member of Shahejie Formation (ES1) is 1.88, showing

Land use/land cover change (LUCC) and climate changes are responsible for degradation of any ecosystem in arid and semi-arid regions. Studying the ecological variations is particularly essential for any type of sustainable development, in which LUCC considers as one of the chief inputs. The main objective is to evaluate the impacts of LUCC and climatic changes on the Ecosystem Vulnerability (ESV) using

This study uses exploration data to optimise overburden thickness, cut-off grade and stripping ratio at some alluvial gold mines in the Kibi mining district to improve gold recovery in Ghana. The specific objective is to determine sampling location, overburden thickness, gravel thickness, gravel grade and gold contents. Secondary data are from 48 mining blocks at Kwabeng mine and primary data from

Soil in nature may exist in a stratified state. A possible condition is the case of a rigid layer underlying a weak sand stratum. In this instance, the bearing capacity of a shallow footing is affected by the lower rigid boundary. The treatment of thin soil layer by geocell reinforcement to raise the load carrying capacity of single shallow footing has been limited in the literature. Accordingly, rigid

Frequent floods and deterioration of drained water quality are the main problems in rapidly developing urban zones, mostly because urbanization reduces the areas with natural ground that can absorb stormwater and therefore prevent floods and pollution. In order to have a solution which can solve these problems and which could be acceptable for the nature and people, decentralized drainage systems were

Heavy metal pollution in soils is currently a critical environmental issue. Soil amendments can reduce the availability of contaminants and retard their offsite movement by water. A study was conducted to reduce the water solubility and leachability of heavy metals (HM) (cadmium (Cd), lead (Pb), nickel (Ni), chromium (Cr), and copper (Cu)) from polluted soil using various ground natural materials,

Digital elevation model, acquired and generated using manual field survey, stereo pairs, interferometric synthetic aperture radar (InSAR) and light detection and ranging techniques to characterize terrain topography, plays a dynamic role in geological and hydrological applications. Digital elevation models (DEMs) are subjected to comprise ineradicable faults owing to acquirement techniques and pre-processing

Selenium (Se) is an essential trace element for humans but non-essential for plants. Selenium bioavailability depends on selenium forms in soil. Selenium contents may vary with the source of parent material, and pedogenesis controls its vertical distribution. The objectives of this study were to determine the variation in Se fractions with parent material and pedogenesis in Pothwar uplands of Pakistan

The current study adopts a spatial multidisciplinary approach for applying allocation models in zoning new urban sustainable communities in El-Fayoum Desert. Landsat 8 OLI imageries acquired in 2016, Shuttle Radar Topography Mission data, and thematic maps were utilized. Three spatial multicriteria sub-models were designed to create three criteria themes, namely, land resources, infrastructure, and

This study describes the mobility and chemical fractionation of zinc (Zn) and cadmium (Cd) in eight calcareous soils of Fars province in Iran. A 15 mg kg-1 Zn of zinc sulfate (ZnSO4∙7H2O) and 15 mg∙kg-1 Cd as cadmium sulphate (CdSO4∙8H2O) were added to soils. There were 3 replicate beakers per treatment. After 2 months incubation time, the sequential extraction technique was used to determine the Cd

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) image interpretation methods such as colour composite images (false colour composite, true colour composite) were adapted to capture the image for interpreting the visible and shortwave infrared raw bands and thus generating the mapping for the ultramafic terrain. ASTER colour composite image generated from shortwave infrared

The soil heterogeneity has a significant impact on the stability of geotechnical structures. The inherent variability of parameters in one soil type comes from different deposition and tectonic conditions. Furthermore, geological uncertainty could be described by the distribution of varying soil types. Therefore, considering both the inherent variability and geological uncertainty of soil parameters

Rhythmic springs are characterized by a rhythmic flow attributable to a hydraulic phenomenon of filling and emptying one or several siphonic reservoirs located upstream of the springs. The M’Chaki spring is the only rhythmic spring in Algeria. The present research was carried out to determine its hydrodynamic functioning on the basis of understanding the hydrodynamic and chemical responses of the spring

Coal production under deep mining conditions is jeopardized by the stability loss of mining roadways: their adequate support has become an urgent technological and economic problem. In this study, a concrete-filled steel tubular (CFST) support applicable to deep mining roadway was proposed, and the related stress state was theoretically analyzed. For a deep mining roadway, the numerical model based

The water quality of the Hammam-Grouz dam is deteriorating. This deterioration is due to the inputs of pollutants and nutrients from sewage discharges and the use of fertilizers in agriculture. These waters, normally stored to meet growing domestic, industrial, and agricultural needs, are also polluted, and this pollution is increasing over time. The objective of this work is to assess water quality

This paper proposes the definition of groundwater environment evolution pattern by researching the evolution law of groundwater environment in Yishu Basin, and divides the groundwater environment evolution into five patterns according to the different influence degrees of climate change and human activities. According to the groundwater dynamic monitoring data of the study area from 1980 to 2014, the

In order to restore the normal development of nitrogen drilling technology, it is significant to gain a deep and comprehensive insight into the bottom-hole rock failure mechanism induced by gas-induced fracture. In this paper, the mechanism of bottom-hole rock failure induced by gas-induced fracture was analyzed by means of conventional analysis method of wellbore instability. The research suggests

The Yuheng mining area of the Jurassic coalfield in northern Shaanxi Province is one of the most important coal-producing regions in China. The present study examines the mechanism of a water-rich coal seam in this area, namely, the No. 2 water-rich coal seam of the Balasu coal mine, by using the groundwater aquifers. From pumping and water chemistry tests, a macroscopic study of the aquifers, and

Formation damage is commonly known as a great cause for the production decline, owing to the unclear formation damage mechanisms under the reservoir geological and engineering conditions. This paper aims to develop a formation damage control technology during drilling for the protection of the natural productivity of saline-lacustrine reservoir. Reservoir geological characterization is first presented

Predicting permeability from nuclear magnetic resonance (NMR) logging data using SDR model and Coates model provides a quick and relatively reasonable value for reservoir permeability estimate. Critical to these two models is to find contributions of different level of pore structure to permeability, but pore structure in them is only divided into two levels. In this study, T2 distribution is divided

Kerala, the southern state of India, was severely hit by a massive flood in August 2018 affecting millions of people causing loss to the state exchequer. The aim of this paper was to study the impacts of this flood on mineralogy, geochemistry (grain size, and heavy metal content) and nutrient content (organic carbon, total and available nitrogen, and phosphorus) of sediment of flood affected Pampa

In order to obtain a new technology of on-site nitrate removal, a permeable reactive barrier (PRB) column was prepared by coupling the denitrifying bacteria with the use of agricultural waste. Nitrate removal in groundwater at low temperature (16 °C) and different hydraulic conditions was investigated in laboratory. Corncob was considered to be the most effective carbon source after the optimization

Medium- and long-term mine planning depends on a large series of probes to determine the continuity and content of mineralized zones and the development direction of the exploration. In addition to being logistically complex and onerous, this process is financially wasteful. In this way, Geophysics is an alternative and indirect investigative tool traditionally used in various phases of mineral exploration

Globally, flash floods are the most damaging natural hazards, because of its sudden nature and difficulty in forecasting that restrains emergency responses. Flash floods triggered by thunderstorms are frequent in the high mountainous area of Hindukush Himalaya in the north of Pakistan. The current study employed two widely used approaches for flash flood risk modeling, i.e., morphometric ranking approaches

The article describes how current risk assessment of pressure mining using the “water inrush coefficient method” based on the Down Three Zones Theory is relatively inconsistent with the facts in practice. Based on the Down Three Zones Theory, the intact aquiclude is divided into a water pressure-free zone and a water pressure zone, and four kinds of mining discriminant models containing pressure are

Geochemical exploration of stream sediments is an important step for the identification of areas of interest with potential mineralization, particularly in the early stages of mineral exploration. A total of 407 sample points for 15 different geochemical traces were collected from Central Wales and classified into two groups: a training group consisting of 285 samples and a testing group consisting

Rockfalls, which are a common natural hazard, collide and continuously bounce along slope surfaces during their movement; the coefficient of restitution (COR) and impact force are two important characteristic parameters related to the impact process of a rockfall. In this paper, considering the elastoplastic characteristics of the ground material, a theoretical model is proposed to obtain the normal

Algeria does not count any classified geoparks despite its wealthy geological heritage, particularly in Tamanrasset province (southern Algeria). The economic activities in this province require promotion and diversification apart from the oil and gas industry. While tourism can be a crucial driver of its local development, tourist arrivals and infrastructures, especially in villages, indicate how underdeveloped

In this paper, a DEM model is proposed based on Particle Flow Codes (PFC) software, which simulates a sand layer collapse process in tunnel excavation of Qingdao subway project. The fluid–particle interaction was solved with the coarse-grid method in order to account for the influence of groundwater on the movement of sand layer. The development of sand layer collapse and the displacement field were

Major and trace element concentrations of thirteen limestone samples from zone XX of the Tlayúa Quarry Fossillagerstätte were analysed with the aim of elucidating the source of rare earth elements plus yttrium (REE+Y) as well as some palaeoenvironmental conditions attributable to them. The concentrations of cortex-derived elements/element oxides (SiO2, Al2O3, Zr), as well as of phosphorus, show no

This study investigates changes in the spatial distributions of paddy fields in the Songnen Plain (China’s largest commodity grain-producing area) using the Satellite Pour l’Observation de la Terre–Végétation (SPOT VEGETATION) time series product data to simulate the phenological characteristics of paddy rice growth. According to the analysis, the characteristics of paddy fields are different from

Gleysol and ferralsol samples were collected at Dimako (Eastern Cameroon) to investigate their use as raw materials in the ceramic industry, using petrological and physicochemical approach. Field and analytical investigations reveal that gleysols are grey-white with sandy clay textures. The organic carbon contents are low in both soil types. These soils are characterized by low cation exchange capacity

Soil is one of the most important natural resources; therefore, there is an urgent need to estimate soil erosion. The subtropical monsoon-dominated region also faces a comparatively greater problem due to heavy rainfall with high intensity in a very short time and the presence of longer dry seasons and shorter wet seasons. The Arkosa watershed faces the problem of extreme land degradation in the form

The 18 main physicochemical parameters were analyzed in 8 surface water samples and 67 groundwater samples from a typical riverside alluvial aquifer (RAA), which is the main water source in northeast China and is mainly characterized by nitrogen pollution. By integrating hydrochemical methods and multivariate statistical methods (hierarchical cluster analysis (HCA), principal component analysis (PCA)

Rainfall is a common factor that triggers the instability of Victorian Brown Coal (VBC) open pits which facilitate some of the largest brown coal mining operations. There has been no relevant study on rainfall-induced slope instability of VBC open pits in literature. In this paper, a three-dimensional (3D) two-phase (fluid-solid) coupled finite element method (FEM) was employed to investigate the stability

Coal mine roadway junctions in bord and pillar mining, in particular, are more vulnerable to roof fall due to the excavation induced stresses as well as general stress loading pattern inherent to the typical cross section achieved in practice. Roof fall incidences are generally more in junctions of development galleries and a cause of concern as they provide access to faces in different directions

The Shahrokht-Yazdan Playa is a sedimentary inland basin in the east of Iran and west of Afghanistan. It covers an area of 212.5 km2, lying 135 km northeast of Qayen at a border region known as Shahrokht. Some parts of the playa have stretched into Afghanistan (Yazdan area). In this playa, water level is controlled by the amount of rainfall, evaporation and groundwater recharge. To study the brine’s

The original version of this paper was published with error.

Badlands are a hydrogeomorphological feature with operative processes leading to intense erosion. This study utilizes the morphometric methods with the help of remote sensing data in a GIS environment to determine the characteristics of the badlands of Mandakini River watershed and their interpretation to explore the factors responsible for the formation of the typical landforms. Objective interpretation

In order to investigate the variation regularity of coal mass electrical resistivity in a complex stress environment, a real-time testing system of resistivity variation regularities of coal under loading was established in this study. Through this testing system, resistivity variations of coal mass under uniaxial compression, cyclic loading, multi-stage loading, stress relaxation, and creep loading

A field case was first studied to verify the reliability of PLAXIS 2D and the accuracy of the modeling and calculation methods, in terms of calculating the radial earth pressure and vertical deformation on the cut-and-cover and trenchless pipes. Then, four types of classical soils were considered to compare the effects of cut-and-cover and trenchless construction methods on the installed flexible pipes

The hydrogeological characteristics are required for investigating the modelling processes. The transmissivity and hydraulic conductivity values which are obtained from the inverse methods and pumping tests are not representative in the northern part of France where the major aquifer is composed of the chalk deposits. In addition, these methods are costly and time-consuming. In the north of the Paris

Hyperconcentrated floods with sediment concentrations higher than 300 kg/m3 often occur in the lower Weihe River. These floods result in extremely high water levels and severe channel evolution and may pose a threat to people and property in certain reaches. Therefore, it is necessary to accurately simulate hyperconcentrated flood routing processes and the associated channel evolution in the lower

We studied Fe-rich microspherules and microparticles found as inclusions within a gypsum host rock, sourced from the Kamsko-Ustyinskoe gypsum field (Republic of Tatarstan, Russia). Using both in situ and destructive microanalysis techniques (micro CT, XRF, SEM, EDS, and Raman spectroscopy), we examined a range of different possibilities of their origin and concluded that studied Upper Roadian microinclusions