Engineering and Technology Journal

SWOT-Based Assessment of the Maintenance Management of the Wastewater Treatment Plants in Iraq

Reem Tareq Al-Attar; Faris H. Al-Ani; Mahmoud Saleh Al-Khafaji

Volume 40, Issue 5 , May 2022, , Page 677-694

https://doi.org/10.30684/etj.v40i5.2146

Abstract

In Iraq, due to WWTPs being old and outdated, an evaluation of the maintenance management is needed to highlight the points of weaknesses and strengths of the plants. In this paper, ... Read More ...

Utilization of Satellite Images-Based Indices for Assessment of Al-Hammar Marsh Restoration plan

Bayda A. Dhaidan; Imzahim A. Alwan; Mahmoud S. Al-Khafaji

Volume 39, Issue 8 , August 2021, , Page 1328-1337

https://doi.org/10.30684/etj.v39i8.2149

Abstract

Wetland landscape characterization is an important component of determining the degree to which wetlands improve environmental conditions. The present study aims to create a model used ... Read More ...

ANSYS-Based Structural Analysis Study of Elevated Spherical Tank Exposed to Earthquake

Mahmoud Saleh Al-Khafaji; Ahlam S. Mohammed; Muna A. Salman

Volume 39, Issue 6 , June 2021, , Page 870-883

https://doi.org/10.30684/etj.v39i6.460

Abstract

Damage of elevated tanks during earthquakes can jeopardize the supply of drinking water and causes significant economic losses. Therefore, seismic analysis of tanks containing liquids ... Read More ...

Indices-Based Evaluation of Spatiotemporal Distribution of Drought Within Derbendkhan Dam Watershed

Mahmoud Saleh Al-Khafaji; Rusul A.H. Al-Ameri

Volume 39, Issue 6 , June 2021, , Page 893-914

https://doi.org/10.30684/etj.v39i6.1802

Abstract

Drought is one of the most significant natural disasters in Iraq. It has a strong impact on the water resources in Iraq. Consequently, it causes massive environmental damage, economic ... Read More ...

Empirical Formulas to Predict the Maximum Scour Depth With Debris Accumulation Around A Single Cylindrical Bridge Pier: An Experimental Study

Mahmoud Saleh Al-Khafaji; Aysar T. Al-Awadi

Volume 38, 12A , December 2020, , Page 1790-1800

https://doi.org/10.30684/etj.v38i12A.1349

Abstract

The probability of debris accumulation near bridge piers during the heavy storm and river flood convert the hydraulic action of flow and increase the scour depth due to the reduction ... Read More ...

Effect of DEM and Land Cover Resolutions on Simulated Runoff of Adhaim Watershed by SWAT Model

Mahmoud Saleh Al-Khafaji; Fouad Saeed

Volume 36, 4A , April 2018, , Page 439-448

https://doi.org/10.30684/etj.36.4A.11

Abstract

Accurate estimation of surface runoff by using Soil and Water Assessment Tool (SWAT) model is highly depends on the accuracy of the Digital Elevation Model (DEM), Land Cove and Land ... Read More ... Accurate estimation of surface runoff by using Soil and Water Assessment Tool (SWAT) model is highly depends on the accuracy of the Digital Elevation Model (DEM), Land Cove and Land Use (LC/LU), soil and weather data as input variables. The interactive and complementary effects of the DEM and LC/LU resolutions on the estimated runoff were not taken into consideration in previous studies. This research aims to study these effects on the accuracy of runoff estimation of Adhaim Watershed by using SWAT Model. Twenty surface runoff estimation SWAT models of Adhaim Watershed were implemented using five DEMs with spatial resolution of 30, 50, 90, 250 and 1000m in conjunction with four LC/LUs with spatial resolution of 30, 300, 500 and 1000 m. These models were calibrated and verified on daily time step with the adoption of maximizing Nash and Sutcliffe Efficiency (NS) as an objective function. The results of SWAT models show that specifying the watershed boundary and the total area is highly affected by the DEM resolution without considerable trend. Also, the estimated minimum altitude is inversely related to the DEM resolution, whereas the maximum altitude has a direct relationship. Furthermore, LC/LU resolution is highly affected the number and area of classes that can be distinguished in the LC/LU image. Although, the number of hydrologic response units (HRUs) depends on LC/LU resolution, it was found that this number increases with the increase in LC/LU resolution to a maximum number of HRUs and then it gradually decreases. Whereas, the HRUs has a direct relationship with the DEM resolution and the number of subbasins irregularly changed with the increase of DEM resolution. Results of runoff estimation by using SWAT models show that the estimated runoff is not directly or inversely related to the DEM and LC/LU resolutions. Moreover, the most accurate runoff was not estimated with the highest DEM and LC/LU resolutions, where it is obtained with DEM and LC/LU resolutions of 250 m and 1000 m respectively with NS of 0.74. Accordingly, it is recommended to use these resolutions for estimating the surface runoff of Adhaim Watershed. The relationship between the HRUs and estimated runoff is very complex therefore; more extensive studies are required to comprehend this relationship.

Author = Al-Khafaji, Mahmoud Saleh

SWOT-Based Assessment of the Maintenance Management of the Wastewater Treatment Plants in Iraq

Abstract

Utilization of Satellite Images-Based Indices for Assessment of Al-Hammar Marsh Restoration plan

Abstract

ANSYS-Based Structural Analysis Study of Elevated Spherical Tank Exposed to Earthquake

Abstract

Indices-Based Evaluation of Spatiotemporal Distribution of Drought Within Derbendkhan Dam Watershed

Abstract

Empirical Formulas to Predict the Maximum Scour Depth With Debris Accumulation Around A Single Cylindrical Bridge Pier: An Experimental Study

Abstract

Effect of DEM and Land Cover Resolutions on Simulated Runoff of Adhaim Watershed by SWAT Model

Abstract