Anvar R. Kacimov

Anvar R. Kacimov
Sultan Qaboos University | SQU · Department of Soils, Water and Agricultural Engineering

Fluid Mechanics

About

262
Publications
30,995
Reads
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2,392
Citations
Additional affiliations
February 1998 - December 2012
February 1998 - October 2016
Sultan Qaboos University
Position
  • Professor
Education
September 1982 - October 1986
Kazan State University
Field of study
  • fluid mechanics

Publications

Publications (262)
Article
Darcian, 2-D flows to subterranean holes are studied analytically (by the methods of complex analysis) and numerically (by HYDRUS). For flow towards two circular or quasi-circular tunnels, reconstructed as isobars generated by two sinks under a ponded homogeneous soil surface, the flow nets, the velocity vector fields, and Riesenkampf's seepage for...
Conference Paper
Recharge dams represent one of few engineering techniques to harvest flashfloods water in arid zones for augmenting the limited water resources. Formation of a low-permeable cake by deposition of suspended particles transported by ephemeral floods is a common problem for dams in arid regions (e.g. Oman, Saudi Arabia, Iran, and Tunisia). Accumulatio...
Conference Paper
Hydrology of sand dunes in the deserts of arid regions, specifically, groundwater in aquifers underlying the sand fields (e.g. Wahiba Sands in Oman) has been studied since 1970th. Sustainable water resources management in the desert dunes is essential, particularly in Gulf countries, where no perennial streams exist. Interdunal areas can be explore...
Conference Paper
In the Sultanate of Oman, 174 dams have been constructed as of 2021 for different purposes: flood protection (3 dams), recharge (56) and surface storage (115) with a total storage capacity exceeding 300 million m3. Recharge dams represent one of few engineering techniques to harvest flashfloods water in wadi systems in arid zones for the purpose of...
Article
Managed Aquifer Discharge (MAD) through trenches lowers the water table of ‘shallow perched aquifers’ in urban areas (Muscat-Oman). Drawdown of the water table in periodic trenches or a single trench is experimentally studied in a sandbox, and modelled numerically (by HYDRUS2D) and analytically. Evaluation of transient flow fields of pore pressure...
Article
Full-text available
A shallow water table (SWT) rises up to several centimeters below the soil surface and even exfiltrates making surface impoundments that are common in humid climates. Recently, SWTs emerged even in arid and semi-arid regions of several metropolitan areas of the Arabian Gulf Cooperation Council (GCC) countries with a pernicious impact on the urban i...
Conference Paper
Rises of the water table up to several centimeters below the ground surface and even exfiltration of groundwater into surface depressions are common in humid climates. Recently, a shallow water table (SWT) has emerged in several cities of the arid to semi-arid region of the Arabian Gulf Cooperation Council (GCC) countries that threatens the urban i...
Article
Full-text available
Waterlogging of urban area soil in a hyperarid climate, caused by impedance of evapotranspiration due to land cover by an impervious pavement, is studied by a multidisciplinary team of researchers (hydropedeologists, hydrogeologists, groundwater engineers, soil physicists and mathematical modelers). In this paper, a study unique for an arid/hyperar...
Article
Analytical solutions are obtained for water extinction from an axisymmetric crater, filled at t < 0 and depleted by evaporation and transient infiltration into a Gardner or capillarity-free homogeneous soil during the time interval 0 ≤ t ≤ Te. The extinction time Te is found for crater beds, the shapes of which are shallow cones, spherical, spheroi...
Book
This book presents the most recent innovative studies in the field of water resources for arid areas to move towards more sustainable management of the resources. It gathers outstanding contributions presented at the 2nd International Water Conference on Water Resources in Arid Areas (IWC), which was held online (Muscat, Oman) in November 2020. Pap...
Article
Seawater intrusion (SWI) has been widely investigated in physical sandbox-field experiments and analytical-numerical mathematical models. However, to the best of our knowledge, there were no studies of a commingled dynamics of the triad of saline water, natural fresh groundwater and freshwater injected in managed aquifer recharge (MAR) using sand t...
Article
Seawater intrusion (SWI) has been widely investigated in physical sandbox-field experiments and analytical-numerical mathematical models. However, to the best of our knowledge, there were no studies of a commingled dynamics of the triad of saline water, natural fresh groundwater and freshwater injected in managed aquifer recharge (MAR) using sand t...
Article
Surface water impoundment in an unlined triangular ditch during a single managed aquifer recharge (MAR) infiltration pulse lasts for time Te, after which all initially disposed water seeps into a homogenous isotropic coarse soil. In ditches with initial water W0 with depth H0 and length L, the dyad (W0,H0) vanishes at t→Te. The ditch slope that min...
Article
The classical Barenblatt solution of an initial-boundary value problem (IBVP) to the parabolic Boussinesq equation, which gives a rectangular triangle of full saturation, propagating from a reservoir into an adjacent porous bank with a vertical slope, is shown to coincide with a solution of IBVP to the elliptic Laplace equation with a phreatic surf...
Article
An explicit analytical solution is obtained to an old problem of a potential steady-state 2-D saturated Darcian flow in a homogeneous isotropic soil towards systematic drains modeled as line sinks (submerged drains under an overhanging of a phreatic surface), placed on a horizontal impervious substratum, with a constant-rate infiltration from the v...
Article
In this study, we present an interactive problem-based learning environment, namely, the “Soil Skills” contest for final year students majoring in Soil Sciences, a BSc program at Sultan Qaboos University, Oman. This five-day component of a compulsory field-course exemplifies an active learning approach, which has been promoted by higher educators b...
Article
Seepage through an aquifer, the hydraulic conductivity of which varies vertically, is studied by using the Dupuit-Forchheimer approximation (Girinskii’s potential) and numerically by FDM-MODFLOW and FEM-HYDRUS-2D. In urban water hydrology, the effect of compaction of the top stratum of an aquifer on the flow rate and the position of the water table...
Conference Paper
In arid lands, the coarse porous materials of the beds of ephemeral streams (locally called Wadis in Oman) are conduits for the freshwater that infiltrates-exfiltrates through these beds during irregular rainfall events. The percolating water through the wadi bed forms perched or localized aquifers that severs as a source of water supply for the sc...
Conference Paper
Understanding the eco-hydrology of natural sand dunes (Maliva and Missimer, 2012) can be used in design of mini-dunes (crest ≤ 1 m) as agroengineerd “self-irrigation units”. Minidunes can intercept moisture from humid air and a shallow water table (e.g. in sabkha landforms). Thus, a spot of wet low-salinity fine-textured soil can be maintained natu...
Article
An isobar generated by a line or point sink draining a confined semi-infinite aquifer is an analytic curve, to which a steady 2-D plane or axisymmetric Darcian flow converges. This sink may represent an excavation, ditch, or wadi on Earth, or a channel on Mars. The strength of the sink controls the form of the ditch depression: for 2-D flow, the sh...
Article
Full-text available
Siltation of reservoir beds of recharge dams in arid climates seriously diminishes dams' storage capacity, lessens infiltration and deep percolation rates, increases water loss via evaporation, and ultimately lowers the recharge efficiency to the underlying unconfined aquifer. This study explores possibilities for enhancing the infiltration rate of...
Article
Full-text available
Salinity is a major environmental factor limiting agricultural production in the arid and semi-arid regions of the world. Capillary barrier (CB) created from substrate structuring is a technique that can potentially be used to mitigate salinity, however, little has been done to evaluate the use of structured potting media for this purpose. This stu...
Article
Full-text available
New water-conserving irrigation technologies are vital in arid countries. We investigated the effects of (i) soil substrates made of Smart Capillary Barrier Wick (SCB-W), consisting of silt loam blocks surrounded by sand-sheathes and irrigated with a sand wick cylinder (WC) as compared to a control (homogenous soil irrigated by the same wick system...
Article
Full-text available
Capillary barriers (CBs) as engineered porous composites is novel and promising technology for mitigating salinity and drought stress of plants. This study aimed to imitate a naturally formed CB structure recently discovered in the reservoir bed of Al-Khoud dam at the Governorate of Muscat in northern Oman and to test the impact of this unique CB o...
Article
An isosceles triangle in a vertical cross-section of a trench is considered as a boundary from which free water in the trench seeps into a porous bed. A finite, initially impounded water volume vanishes from the channel and soil moisture moves in conjugation with surface water in a transient 2-D saturated-unsaturated regime. If capillarity is ignor...
Article
Full-text available
New mathematical models are developed and corresponding boundary value problems are analytically and numerically solved for Darcian flows in earth (rock)–filled dams, which have a vertical impermeable barrier on the downstream slope. For saturated flow, a 2-D potential model considers a free boundary problem to Laplace’s equation with a traveling-w...
Article
An isosceles triangle in a vertical cross-section of a trench is considered as a boundary from which free water in the trench seeps into a porous bed. A finite, initially impounded water volume vanishes from the channel and soil moisture moves in conjugation with surface water in a transient 2-D saturated-unsaturated regime. If capillarity is ignor...
Article
Channels are widely used for conveying natural flash floods or managed aquifer recharge (MAR) released treated wastewater. Adequate models are needed for describing the interaction between hydraulics of surface flow downslope the channel and vertical seepage into a porous bed for evaluation of the depth of water and the length to which surface wate...
Article
Full-text available
A thin planar fracture with a highly permeable porous filling disturbs an incident unidirectional one-phase flow in a formation/aquifer and makes it essentially 2-D. The main objective of this paper is to get an analytical evaluation of the quantity of fluid intercepted, conveyed, and released back by the fracture and assessment of the near-fractur...
Article
Full-text available
Evaporation-driven wicking of soil water through porous domains with contrasting hydraulic properties is studied analytically by conformal mappings and compared to numerical solutions. Initially, the connected rectangular domains are fully saturated. The first rectangle, Gp, is comprised of a coarse-textured porous medium with large permeability an...
Article
Seepage through a zoned earth-filled dam with a vertical clay core, two permeable shoulders and toe drain are studied. Seepage through the core and the downstream shoulder are coupled. The flow rate and phreatic surface are found. The hodograph method is used, viz. a conformal mapping of a rectangle in the complex potential plane onto a circular tr...
Article
Baseflow-type interaction between a river and adjacent/subjacent aquifer across a thin clogging layer of fine sediments controls the dynamics of surface-pore water resources, quality of both waters, seepage induced erosion of the river bed and other hydrological phenomena. Transient 2D phreatic flow from an unconfined aquifer into a river with a th...
Conference Paper
Full-text available
Coupled surface-subsurface flow is studied in application to MAR through a lattice of small-size channels constructed on the pedestals of sand dunes or in the interdunal valleys. At the commanding inlet of a lattice (period is L) of equidistant trenches laid at a topographic slope S0, water is released through a cross-sectional area A0(0) of a tren...
Poster
Full-text available
Large areas of desert dunes across arid regions can be explored for MAR if natural channels (wadis) or artificial trenches convey and seep tertiary treated wastewater (TTW) into the vadose zone. Mini sewage treatment plants (STPs of touristic camps and remote villages) can use small-scale infiltration trenches. The key design questions are: • What...
Article
Full-text available
Ovsinsky (1899, https://www.rulit.me/books/novaya-sistema-zemledeliya-read-193251-1.html) suggested and tested a water conserving soil no-till technology for rain-snow-fed field crops in a semiarid environment in southern Russia. We model Ovsynsky's unsaturated flow fragment, in which 1-D steady evaporation and evapotranspiration through a two-laye...
Presentation
Full-text available
Managed aquifer recharge (MAR) through channels conveying water requires adequate models for describing the interaction between hydraulics of surface flow downslope the channel and vertical seepage (infiltration) into a porous bed. We presented experimental, numerical, and analytical modeling of this coupled flow.
Article
A fully-saturated lens of steady fresh groundwater floating in a homogeneous and isotropic desert sandy aquifer is analytically studied based on a hydrological model by Kunin and interface solution by Van Der Veer. A static saline groundwater is beneath the lens. A phreatic surface of moving fresh water inside the lens is partially recharged (eithe...
Article
Full-text available
Evaporation from desert sand dunes is studied practically using laboratory columns and mathematically using both analytical and numerical modeling. On outcropping cliffs of the dunes of Buwshar (Oman), microstratification, with layers' thickness of 1–2 mm, was observed. Loose sand and consolidated core samples were collected for laboratory experime...
Article
Omani home-gardens are jeopardized by the poor agronomic practices and unqualified gardeners. This study aimed to find: (i) gardening characteristics, practices and gardener’s perception to irrigation water management, soil preparation-fertility, (ii) determinants of use of water saving methods (WSM), and (iii) reasons for garden adoption. A questi...
Conference Paper
Wadi Al-Fara catchment, located at the northwest of Oman, represents one of the most promising areas for the sustainable agricultural and urban developments. Groundwater resources have been substantially overexploited to provide irrigation, industrial and domestic demands leading to a dramatic decline of the water table in the coastal zone of the c...
Conference Paper
Full-text available
Groundwater resources have been extensively explored in Wadi Al-Fara coastal catchment, located at the northwest of Oman, to supply agricultural, industrial and domestic demands. Consequently, groundwater level has declined, which calls for urgent mitigation strategies to sustain the groundwater resources. Reasonable knowledge of natural recharge t...
Article
Using exact and explicit analytical solutions and MODFLOW simulations we show that downstream of an unconformity (transition from an aquifuge layer to a homogeneous aquitard) groundwater seeps at varying angles with respect to the layering. As a generalization of the Anderson (2003) two-layered composite, a steady, 2-D Darcian flow in a three-layer...
Article
Full-text available
Revising standard structured academic programs by incorporating research throughout the curriculum is a modern trend at universities worldwide. There are numerous publications on inquiry-based learning (IBL) in individual courses, but few provide evidence both of success at the program level and of synergy in the teaching–research nexus. Our strate...
Article
A porous barrier bounded by two confocal ellipses is filled with material of a hydraulic conductivity different from the ambient one in order to control the flow rate inside. Optimization problems are solved by describing the flow through a medium consisting of zones of different properties. For three-component composites, viz. three zones demarcat...
Article
Explicit expressions for the vector fields of specific discharge and scalar fields of stream functions and piezometric heads in a Darcian steady-state essentially two-dimensional (2-D) flow through a three-component composite representing a vertical or horizontal well with a gravel pack and annular skin are obtained and analysed. The refraction con...
Article
Hydrochemistry and well hydrographs are coupled to assess groundwater recharge in the regional catchment of Samail, Oman. The complex geology comprises three aquifers: limestones of the Hajar Supergroup (HSG) at the highlands of North Oman Mountains (NOM); fractured/weathered ophiolites; and Quaternary alluvium. Groundwater flows south–north from t...
Article
Full-text available
Abstract Steady, 2-,3-D Darcian flows generated by a dipole (a pair of horizontal or vertical 2 injection–abstraction wells closely placed one above another), with circulation of fresh water 3 inside an interface confined lens or “bubble” underneath an impermeable caprock, surrounded 4 by a static saline groundwater, are analytically studied. For 2...
Article
Flows in homogeneous topsoils with a subjacent substratum or horizontal groundwater table generated by line-point emitters are studied and tracked back to the Kornev method of subsurface irrigation. Laplace's equation governs flow in a saturated or tension-saturated hat-shaped zone subtended by the substratum, provided pressure in a porous pipe or...
Article
Full-text available
Kornev’s (Subsurface irrigation, Selhozgiz, Moscow-Leningrad, 1935) subsurface irrigation with a periodic array of emitting porous pipes is analytically modeled as a steady potential Darcian flow from a line source generating a phreatic surface. The hodograph method is used. The complex potential strip is mapped onto the triangle of the inverted ho...
Article
A study is made of a steady, two-dimensional groundwater flow with a horizontal well (drain), which pumps out fresh water from an aquifer sandwiched between a horizontal bedrock and ponded soil surface, and containing a lens-shaped static volume of a heavier saline water (DNAPL-dense non-aqueous phase liquid) as a free surface. For flow towards a l...
Conference Paper
Full-text available
The hydrological and economic feasibility of managed aquifer recharge (MAR) using tertiary treated wastewater (TTWW) to mitigate salinity in two selected costal aquifers in North of Oman has been studied numerically using the code, MODFLOW 2005 and different transport packages MT3DMS and SEAWAT. The two coastal aquifers are the Jamma aquifer which...
Article
Analytical and numerical (HYDRUS2D and MODFLOW) solutions for steady unconfined Darcian flows with accretion and leakage in a single aquifer is obtained for domains bounded by trigons (in particular common triangles) and polygons that allows modeling catchment - scale groundwater flows. Strack’s comprehensive potential obeys the 2-D Poisson equati...
Article
An analytical solution is obtained for 2-D steady Darcian flow under and through a cutoff wall partially obstructing a homogeneous isotropic foundation of a dam. The wall is leaky; that is, flow across it depends on the ratio of hydraulic conductivity of the wall and the wall thickness that results in the third-type (Robin) boundary condition along...
Conference Paper
Groundwater recharge dams represent one of few practical engineering techniques to augment the limited water resources. Formation of a low-permeable cake by deposition of suspended particles transported by ephemeral flashfloods is a common problem for dams in arid regions (e.g., Oman). The Al-Khoud dam, Oman, is considered in this study (Ebrahim et...
Conference Paper
Groundwater recharge is an essential groundwater budget component, especially in arid areas, that will provide key information for water development/management plans and water legislation and abstraction. Estimating recharge for any groundwater system is a complicated process due to temporal and spatial variations and uncertainties characterizing m...
Article
Design of managed aquifer recharge (MAR) for augmentation of groundwater resources often lacks detailed data, and simple diagnostic tools for evaluation of the water table in a broad range of parameters are needed. In many large-scale MAR projects, the effect of a regional aquifer base dip cannot be ignored due to the scale of recharge sources (e.g...
Conference Paper
Experimental measurements of the volumetric moisture content and temperature in a composite soil were done during March-May in an open area subject to direct solar radiation in Muscat, Oman. The composite was made of a silt block and sand sheath adjacent to five faces of the block, with one face open to direct evaporation. For a two layered composi...
Article
Full-text available
Mosaic 3-D cascade of parallelepiped-shaped silt blocks, which sandwich sand-filled cracks, has been discovered in the field and tested in lab experiments. Controlled wetting-drying of these blocks, collected from a dam reservoir, mimics field ponding-desiccation conditions of the topsoil layer subject to caustic solar radiation, high temperature a...
Book
Full-text available
This book presents the most recent innovations, trends, concerns and practical challenges, and solutions in the field of water resources for arid areas. It gathers outstanding contributions presented at the International Water Conference on Water Resources in Arid Areas (IWC 2016), which was held in Muscat, Oman in March 2016. The individual papers...
Article
The Russian engineer Kornev in his 1935 book raised perspectives of subsurface “negative pressure” irrigation, which have been overlooked in modern soil science. Kornev's auto-irrigation utilizes wicking of a vacuumed water from a porous pipe into a dry adjacent soil. We link Kornev's technology with a slightly modified J.R.Philip's (1984) analytic...
Book
Full-text available
Series: Springer Water ▶ Explores state-of-the-art technologies for waste treatment in arid areas ▶ Presents recent advances to further improve the critical water situation ▶ Discusses essential water-related challenges and proposed solutions This book presents the most recent innovations, trends, concerns and practical challenges, and solutions in...
Article
Full-text available
Steady, laminar, fully developed flows of a Newtonian fluid driven by a constant pressure gradient in (1) a curvilinear constant cross section triangle bounded by two straight no-slip segments and a circular meniscus and (2) a wedge bounded by two rays and an adjacent film bulging near the corner are studied analytically by the theory of holomorphi...
Article
An analytical solution to the Poisson equation governing Strack's discharge potential (squared thickness of a saturated zone in an unconfined aquifer) is obtained in a wedge-shaped domain with given head boundary conditions on the wedge sides (specified water level in an open water body around a porous promontory). The discharge vector components,...
Article
Full-text available
We study the effects of treated wastewater (TWW) discharge into the Zarqa River in Jordan and the underlying unconfined limestone Hummar Aquifer. The main objectives were to develop a conceptual model of the aquifer, to gain better understanding of water dynamics in the basin and to investigate different management scenarios of conjunctive use of g...
Article
This article reports the efficacy of a research-based learning (RBL) exercise on hydropedology of arid zones, with guided and open research projects (OPR) carried out by teams of undergraduate students in Oman. A range of activities and assessments was used to support student learning during the three-month course. Assessment included monitoring of...
Conference Paper
Full-text available
Jordan is an arid country, facing great challenges due to limited water resources. The shortage of water resources constrains economy, especially agriculture that consumes the largest amount of available water (about 53 % of the total demand). According to the Jordan Water Strategy 2008-2022, groundwater is twice greater than the recharge rate. The...
Presentation
Full-text available
Three strategies in a soil science undergraduate programme with inquiry-based learning (IBL) principles at Sultan Qaboos University, Oman, are presented. The first strategy scaffolds courses into three phases: with direct instructional guidance, structured IBL, and finally, guided to open IBL. The second strategy involves extra-curricular activitie...