Abdul-Sahib T. Al-Madhhachi

Verified

Abdul-Sahib verified their affiliation via an institutional email.

Learn more

Verified

Abdul-Sahib verified their affiliation via an institutional email.

Learn more

• Ph.D., Civil and Environmental Engineering, Oklahoma State University
• Professor (Full) at Mustansiriyah University

The erosion rate of cohesive soils is typically computed using an excess shear stress model based on the applied fluvial shear stress. However, no mechanistic approaches are available for incorporating additional forces, such as groundwater seepage into the excess shear stress model parameters. Seepage forces are known to be significant contributor...

Typically soil erodibility is quantified using an excess shear stress equation, dependent on two major soil parameters: the critical shear stress (Tc) and the erodibility coefficient (kd). A submerged jet test (JET, Jet Erosion Test) is one method that has been developed and methodology of use established in the literature for measuring these param...

Application of jet erosion tests (JETs) to study in situ erodibility is gaining popularity. New versions of the JET (original JET versus mini-JET) and new data analysis techniques have introduced questions regarding their operation and data collection procedures. One of the major issues regarding JETs is the high degree of variability of the erodib...

Typically the erosion rate of cohesive soils is modeled using the excess shear stress equation, which includes two soil parameters: the erodibility coefficient (kd) and the critical shear stress (τc). Alternatively, a mechanistic detachment rate model, the Wilson model, was recently developed to predict the erosion rate of cohesive soils, also base...

Typically the erosion rate of cohesive soils is modeled using the excess shear stress equation, which includes two soil parameters: The erodibility coefficient (kd) and the critical shear stress ( ô c). A jet erosion test (JET) is a standardized method available for deriving the erodibility of cohesive soils. The JET data are typically analyzed usi...

A 2D numerical model was performed for the flume experiments to clarify the combined effect of the vegetation patches mimicked by circular cylinders attached vertically in a laboratory canal with different bed roughness on the flow characteristics. Eleven patches with numbers of cylinders were distributed uniformly at a distance of 0.20 m center-to...

A program to monitor river water quality is necessary to maintain public health and costly freshwater resources. This research was conducted to assess stream water quality for drinking and irrigation purposes at 11 stations at water treatment plant intakes along the Tigris River in Maysan Province during the summers of 2013 and 2020. Water samples...

The role of a circular vegetated patch size that emerged in stream flows has not yet been fully investigated. In this study, a circular patch was investigated to explore the influence of the patch diameter in terms of vegetation density and cylinder configuration in terms of blockage impact on the calculated drag coefficient CD. Four patch diameter...

Two types of membranes, for hydrophilic and hydrophobic microfiltration, were prepared as flat sheets to treat a phenol-contaminated water solution. The membranes were fabricated using four synthetic polymers: polysulfone, polyethylene oxide, dimethylacetamide, and N-methyl-2-pyrrolidone. Scanning electron microscope measurements of the top-surface...

Ring footing represents a significant structural member in different applications such as fuel or water storage tanks in addition to other structures. The advantage of this type of footing is related to the ability to reduce the weakness of some soils that may affect the safety of structures. An experimental testing program was conducted by using a...

The erosion rate of cohesive soils is typically computed using an excess shear stress model based on the applied fluvial shear stress. However, no mechanistic approaches are available for incorporating additional forces, such as groundwater seepage into the excess shear stress model parameters. Seepage forces are known to be significant contributor...

Seepage influences the erodibility of streambanks, streambeds, dams, and embankments. Usually the erosion rate of cohesive soils due to fluvial forces is computed using an excess shear stress model, dependent on two major soil parameters: the critical shear stress ( c) and the erodibility coefficient (k d). A submerged jet test apparatus (JET-Jet...

A variety of methods, including both modeling and non-modeling water balance techniques, are used in this study to estimate water availability allocated for different demands. The area under investigation is the shared Diyala River basin between Iraq and Iran, which is vulnerable to climate change impact and upstream control and aims to enhance wat...

The drag coefficient of a one-line circular patch of emergent sparse vegetation in an open-channel flow or riverbeds with varying bed roughness sizes was experimentally investigated. The total roughness of the channel was accounted for using the rate of energy dissipation that incorporated resistance by bed particles and cylinder obstacles. A total...

Backwater rise is a function of flow properties, fluid characteristics, and channel geometries. Flume experiments were conducted to investigate the effect of the permeable spur dike dimensions (blockage ratios of 45% to 77%) and diameters of mono-size glass beads (7.4 mm to 26.0 mm) on the backwater rise in open channel subcritical flow. Dimensiona...

Humic acid (HA) is a material that could be used to decrease erosion and improve soil structure. It is also known that biological soil crusts (biocrusts) have a major role in soil stabilization, but the mechanism is not well understood in the presence of HA, especially with mechanistic soil detachment rate parameters (b0 and b1) of the Wilson model...

Extreme climate and weather events have direct impacts on human life, the environment, and resources. The Diyala River basin is shared between Iraq and Iran, which makes it vulnerable not only to climate change effects but also to upstream control. Therefore, understanding and predicting extreme events is an essential step to help decision-makers m...

Humic substances have an essential function in soil fertility and are viewed as being of prime importance for soil aggregation stability. Humic substances as part of humus-soil organic matter are chemicals generated from the biomolecules physically, chemical and microbiologically (humifying). It is essential since it is the most pervasive biologica...

Tigris River is the only potable source in Baghdad city therefor many water treatment plants were built on the banks such as Al-Karkh, Sharq Dijla, Al-Sadr, Al-Wathba, Al-Karama, AlQadisia, Al-Dora, Al-Wahda, and Al-Rashed project. Tigris River suffers from the pollution that comes from various sources such as Industry, domestic sanitation, and far...

The use of raw white eggshells (WES) as a catalyst, and promoted WES with acetic acid as a promoted catalyst for study the adsorption of cobalt (CO +2) and lithium (Li +) ions from polluted soils was investigated in this paper. The selection of a treated chemical substance was achieved after performing several experiments under controlled laborator...

One of the most important causes of river pollution is soil and water pollutions since no previous numerical studies linked the water quality indices and soil erosion parameters. The current research investigates the relationships between water quality parameters and indices versus parameters of soil erodibility (τc and kd) of Tigris Riverbanks wit...

The present work illustrates the potential application of techniques of spatial analysis via geographic information systems (GIS) to categorize the distribution of temporal and spatial of water prediction characteristics to determine the water quality parameters of the Shatt Al-Arab River (SAA), southern Iraq. Eight main water quality parameters an...

Pooled step cascade weirs are hydraulic structures that are preferred over ordinary weirs due to their application on steep slopes and to their effectiveness in obtaining water aeration. However, these structures are subject to failure due to scour being initiated downstream, or to breakdown due to the high energy of impinging water. In this paper,...

The quality of groundwater is a global concern that is usually assessed using quality indices. The Canadian Water Quality Index (CWQI) alongside with Geographical Information system (GIS) were adopted to evaluate the quality of Kirkuk’s groundwater in terms of its suitability for drinking, irrigation, aquatic, recreational purposes, and livestock u...

In the present study, this work investigated the effects of bacteria (Bacillus sp.) decay and biological aggregating factors (organic matter, microbial calcium carbonate precipitation) at various steps on soil aggregate stability. Experiments carried out at different cultivation time 2, 5, and 8 weeks. The soil samples were compared the control (pu...

The benefit of using a weir is that it allows flowrates to be measured and controlled in open channels and streams. The objectives of this research are: (1) to specify a suitable crest depth position as a control section for estimating the flowrate above a curved crump weir at ten different longitudinal slopes and (2) to compare the proposed flowra...

Recently, water quantity is decreasing due to high temperatures in summer and reducing the water quotas of Euphrates River in Iraq from the neighboring countries. These factors may increase turbidity and concentration of elements in Euphrates River especially near Alhindya Barrage, Babylon Governorate, Iraq. Thus, Euphrates River may not be valid f...

Biological soil crusts (biocrusts) are generally found in many landscapes. Biocrusts are known to have a key role in terms of soil stabilization but the mechanism of biocrusts is poorly understood. Thus, this work intends to examine the impact of two biocrusts: Cyanobacteria and Chlorophyte, on parameters of cohesive soil erodibility (erodibility c...

A huge retreat on Tigris Riverbanks of Numaniyah-Kut reach was recently investigated in Southeast Baghdad, Iraq. Riverbank retreat due to both fluvial erosion and geotechnical failure was recently predicted from bank stability and toe erosion model (BSTEM). The goal of this paper was to compute Tigris Riverbanks stability for three sites (A, B, and...

The Ilisu Dam is part of the Turkish Southeastern Anatolia Project (GAP) and is the largest dam on the Tigris River in Turkey. It is located on the main river course 65 km upstream of the Syrian and Iraqi border. The Ilisu Dam watershed is the same as that of the Mosul Dam in Iraq. Sharing the same watershed with the Mosul Dam and located upstream,...

The use of theoretical models, with multiphase flow (air, water, and sand), is lacking in prior research for the simulation and management of erosion around hydraulic structures. In this research, flume experiments and a Computational Fluid Dynamic (CFD) model were used to study flow properties and scour around four new shapes of submerged weir: in...

Many factories and hospitals dumped their wastewater into Tigris River without any treatment in Baghdad city. This could influence on soil erodibility on Tigris Riverbanks. Phenol, Nitrate, and Phosphate were considered as huge concentrations in wastewater chemicals. The main objectives of this research were: 1) to investigate the influence of thre...

Large amounts of runoff is generated in western Iran and flows into eastern Iraq due to relatively intensive rainstorms along the international border line. Currently, most of this runoff is being wasted by evaporation instead of being stored and preserved for later uses. This paper is an attempt to (1) assess and harness the water resources of eas...

Recent studies have investigated the influence of Iraqi stabilizer materials on the stability of artificially lead-contaminated soil. Prior research has not been able to predict the non-linear erodibility model (Wilson model) of mechanistic parameters (b0 and b1) from jet erosion tests (JETs) due to lead-contaminated soil treated with different sta...

Middle and southern Iraq suffers from polluted soils due to crude oil, spilled on land, leakage from transmitting pipe networks, or petroleum products from refineries. Many researchers have studied pollution impacts on the soil in details, but there is a clear lack of investigation on the influence of crude oil on soil erodibility. Recent researche...

Evaporation from bare soil is more complicated than evaporation from the surface of water. Weather components and soil characteristics are factors that affect soil evaporation. The main objective of this paper is to test the viability of using evaporation from the surface of water as the main parameter in estimating evaporation from bare soils. Two...

Iraqi soil contamination greatly influenced soil detachment. Previous researchers have not been able to predict the influence of crude oil soil contamination on either the mechanistic dimensional detachment parameter b0 or the threshold parameter b1 of the mechanistic detachment model (Wilson model). The aims of this research were (1) to investigat...

Most researches have predicted soil erosion of cohesive riverbanks using linear (excess shear stress model) and non-linear (Wilson model) models based on two soil parameters (detachment coefficient, kd, and critical shear stress, τc) of the linear model and two soil mechanistic parameters (mechanistic detachment parameter, b0, and threshold paramet...

Solidification or stabilization treatment is usually used to stabilize site of contaminated land. Several common binding materials, such as cement, hydrated lime, and bitumen, were usually utilized as stabilizer materials for contaminated soil and tested by conventional techniques (such as wet sieving and dispersion ratio methods). Recent studies h...

A new laboratory study conducted on stepped spillways in order to investigate their efficiency of dissipating flow energy. All previous study on stepped spillway indicated that the flow energy dissipation decreased as increasing in discharge. Increasing in the step numbers and the spillway slope led to energy dissipation decrease. In this study, an...

Recent researches were investigated the high concentrations of Lead in Baghdad soils due to the emissions from Leaded fuel of cars, generators, and the industrials. These high concentrations in addition to their impact on human health may impact on the landscape and streambanks and may cause significant issues on soil erodibility. The erosion rate...

Recent research has proposed the use of a mechanistic detachment model, called the Wilson model, in place of the excess shear stress equation for predicting the detachment of cohesive soils during erosion. However, this mechanistic detachment model was also proposed as being valid for noncohesive soils but with limited evaluation. Such erodibility...

The erosion rate of cohesive soils due to fluvial forces is usually computed using an excess shear stress model. However, no mechanistic approaches are available for incorporating additional forces, such as seepage, into the excess shear stress model parameters. Recent research incorporated subsurface (seepage) forces into a mechanistic detachment...

Mechanistic models have been proposed for soil piping and internal erosion on well-compacted levees and dams, but limited research has evaluated these models in less compacted (more erodible) soils typical of hillslopes and streambanks. This study utilized a soil box (50 cm long, 50 cm wide and 20 cm tall) to conduct constant-head, soil pipe and in...

Recent researches has proposed the use of more fundamentally-based mechanistic detachment models in place of the excess shear stress equation, but limited research has been performed in predicting the parameters of these alternative detachment models for non-cohesive gravel soils. One such model examined in this research is the Wilson Model, which...

Fluvial erosion in streambank stability models is typically modeled using an excess shear stress equation based on two soil parameters: the erodibility coefficient (kd) and critical shear stress (Ï„c). For cohesive soils, methods exist such as jet erosion tests (JETs) for measuring kd and Ï„c. For noncohesive bank materials such as sands and gravel...

Typically the erosion rate of cohesive soils is modeled using the excess shear stress equation, which includes two soil parameters: the erodibility coefficient (kd) and the critical shear stress (τc). Alternatively, a mechanistic detachment rate model (“Wilson Model”) was recently developed to predict the erosion rate of cohesive soils. The ge...

The excess shear stress approach is commonly used to quantify the erosion rate of cohesive soils due to fluvial forces, dependent on two major soil parameters: the critical shear stress (Ï„c) and the erodibility coefficient (kd). The excess shear stress equation is commonly used in streambank, hillslope, and runoff models. However, mechanistic appr...

The erosion rate of cohesive soils is commonly quantified using the excess shear stress model, which is dependent on two major soil parameters: the critical shear stress (τ c) and the erodibility coefficient (kd). A submerged jet test (jet erosion test, or JET) is one method that has been developed for measuring these parameters. The disadvantage o...

High streambank erosion and failure rates on streams in the Ozark ecoregion of Oklahoma may be attributed to land use change and degradation of riparian areas. Numerous benefits may be achieved from streambank stabilization, but methods are needed to determine the most critical reaches for investing limited funds. Rapid geomorphic assessments (RGAs...

Seepage influences the erodibility of streambanks, streambeds, dams, and embankments. Usually the erosion rate of cohesive soils due to fluvial forces is computed using an excess shear stress model, dependent on two major soil parameters: the critical shear stress (τc) and the erodibility coefficient (kd). A submerged jet test apparatus (JET- Jet E...

The trickle irrigation method is a relatively new watering technique which has proven to be a progressive, successful development all over the world. Benefits of using this method in vast areas of Iraq are obvious, especially in parts of drought areas where development and reclamation necessitate the use of trickle irrigation. Previous field resear...

Many factors affect the erodibility of cohesive soils, such as the soil characteristics, soil moisture content, and properties of the eroding fluid. Typically the erosion rate of cohesive soils is quantified using an excess shear stress equation, dependent on two major soil parameters: the critical shear stress (τc) and the erodibility coefficient...

Seepage influences the erodibility of streambanks, streambeds, dams, and embankments. However, the interaction between fluvial and seepage mechanisms in cohesive soils is still poorly understood. Usually the erosion rate of cohesive soils due to fluvial forces is computed using an excess shear stress equation, dependent on two major soil parameters...

The importance of groundwater seepage and pipeflow is unknown with respect to other fundamental processes of streambank erosion and failure, although seepage and pipeflow features are observed on streambanks throughout the world that span a range of geomorphologic conditions. Previous field and laboratory research on seepage erosion has demonstrate...

In this research, two procedures have been developed to predict runoff hydrographs from graded border and furrow irrigation systems. One of the procedures is based upon volume balance principle and the other is based upon the application of Manning's formula. The results of the two procedures were compared with actual measured field data in differe...