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Article
MATHEMATICAL SIMULATION FOR TRANSIENT FLOW IN PIPES UNDER POTENTIAL WATER HAMMER
المحاكاة الرياضية للجريان الاضطرابي في الأنابيب المتأثرة بظاهرة الطرق المائي

Author: Qassem H. Jalut قاسم حميد جلعوط
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2010 Volume: Engineering Sc. Conference Issue: First Pages: 222-236
Publisher: Diyala University جامعة ديالى

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Abstract

ABSTRACT:- To protect the physical integrity of a pipeline system, there may be a need to install surge control devices, such as surge relief valves, surge tanks, or air-vacuum valves, at various points in the system. The main purpose of this study is to simulate the transient flow in pipes with water hammer using a mathematical modeling. By taking Omar Almokhtar Reservoir and Omar Almokhtar Grand Reservoir hydraulic system as a case study, where this system located at 35 Km south of Benghazi city. The analysis of simulation of this study is based on a characteristics method assisted by well known software called WANDA which was developed by Delft Hydraulics / Netherlands. Maximum and minimum pressures generated by the different scenarios implemented in this study confirm that the installed air vessels capacity of 1500 m3 are sufficient to control all pressure values within the bar rating of the installed pipes. It is also found that the pipe section just upstream of OMG reservoir air valve(s) with adequate capacity is (are) needed at this section of the pipeline. Air vessels with capacity 1000 m3 are not enough to damps the pressures that occur during transient duration. Keywords:-Water Hammer, Transient Flow, Air vessels.

الخلاصة لحماية منظومة الأنابيب المتعرضة للجريان المضطرب تحت تأثير الطرق المائي هناك حاجة لإنشاء وحدات سيطرة في المنظومة مثل صمامات تخفيف الموجة , خزانات امتصاص الموجة , صمامات سحب الهواء وفي أماكن مختلفة فيها. الهدف الرئيسي في هذه الدراسة هو محاكاة الجريان المضطرب في الأنابيب المتأثرة بالطرق المائي باستخدام النموذج الرياضي . الدراسة تم تطبيقها على الأنبوب الواصل بين محطة الضخ في خزان عمر المختار وخزان عمر المختار الكبير. التحليل المستخدم في المحاكاة يعتمد على Characteristic Method وباستخدام برنامج WANDA . الضغوط العالية والواطئة المستخدمة في السيناريوهات المطبقة في الدراسة أثبت أن إنشاء (Air Vessels) بسعة (1500 m3) كافي للسيطرة على جميع الضغوط المتولدة ضمن مواصفات الأنبوب المستخدم. الدراسة أيضا وجدت أن هنالك حاجة لوضع (Air Valve) في المنظومة مقدم خزان عمر المختار الكبير. كما بينت الدراسة أن استخدام حجم (1000 m3) لل (Air Vessels) غير كافية لتخفيف تأثير الضغوط المتولدة نتيجة الطرق المائي في المنظومة.


Article
Generation of Rainfall Intensity Duration Curves Using Disaggregation Technique

Author: Qassem H. Jalut قاسم حميد جلعوط
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2018 Volume: 11 Issue: 2 Pages: 49-54
Publisher: Diyala University جامعة ديالى

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Abstract

The rainfall intensity-duration-frequency (IDF) relationship is a relationship between rainfall duration, rainfall intensity and storm return period generally required for outlining of various hydraulic structures such as dams, Culverts, Siphons etc. Evaluation of rainfall extreme expected values, as used in intensity-duration-frequency (IDF) relationship, has long been a major interest of both theoretical and applied studies in surface hydrology. The IDF relationship is resolved through factual investigation of tests of records from a given meteorological stations cover the study region. For the present study, information from the verifiable arrangement of most extreme month to month precipitation acquired from a pluviometric Kirkuk station were utilized. They were made accessible by the Ministry of Water Resources. Thirty seven outrageous occasions were gotten from the record from years of 1971 to 2010. Considering that the sample is representative of the genesis of the intense rainfalls of the studied region and that the probability of the events follows distribution of extremes Type I (Gumbel distribution). Many stations do not have long information records for lengths shorter than 1 day and in this way the character of short precipitation lengths must be evaluated from different sources. The fundamental focus point of this paper is to build IDF curves for the area utilizing precipitation recurrence investigation procedures utilizing new disaggregation strategy method. Different durations ranging from 5 minutes to 24 hours for return periods of 5, 10, 50, and 100 years were analyzed


Article
HYDROCHEMICAL ANALYSIS OF GROUNDWATER RESOURCES IN KANAN REGION

Authors: Qassem H. Jalut قاسم حميد جلعوط --- Fatan R. Majeed
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2015 Volume: 8 Issue: 4 Pages: 74-82
Publisher: Diyala University جامعة ديالى

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Abstract

Diyala governorate faces water resources deficiency due to the limited amount of rainfall, drought, and water pollution of Diyala River in addition to the irrational use of water by the residence. The study area (Kannan region) located north east of Baqubba the capital of Diyala governorate depends partially on groundwater as a source of water to meet both agricultural and domestic uses of the region. Several pumping wells has been used for that purposes especially where the surface water is limited. Recently, the surface water has been blocked by transfer it away from the region which enforced residence to relay completely on groundwater. The need of profound hydrochemical study of the region ground water resource become imminent to insure proper groundwater withdrawal and monitor groundwater quality for different uses mainly agricultural and domestic uses. The current study is directed toward investigation of the usability of groundwater for agricultural and domestic uses.

Keywords

ground water --- Kanan


Article
EXPERIMENTAL STUDY FOR ENERGY DISSIPATION USING STILLING BASIN WITH ONE AND TWO CONSECUTIVE DROPS
دراسة مختبرية لتشتيت الطاقة باستخدام احواض التهدئة احادية وثنائية المهابط

Authors: Qassem H. Jalut قاسم حميد جلعوط --- Nagla F. El-Baaja نجلة فرج البعجة
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2014 Volume: 7 Issue: 2 Pages: 61-82
Publisher: Diyala University جامعة ديالى

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Abstract

The scour at downstream of hydraulic structures is one of the major concern in its stability analysis and operation .The excess energy existing immediately downstream of such structures has to be controlled. Hence, it is necessary to design and install a device for dissipating excess energy in order to prevent downstream scour. The drop structures is one of the commonly structures used for dissipating excess energy. In the present study an experimental approach is employed through which different types of stilling basin with different heights were tested using one drop and two consecutive drops. Moreover the effect of the end sill and baffles with different heights and different bed slopes was investigated. The hydraulic parameters involved were measured experimentally using a model of straight drop installed in the available (S6) multi-purpose flume in the fluid mechanics lab at the Civil Engineering Department, University of Garyounis.Results showed that, for one drop the presence of end sill reduced the length of the jump by a small value approximately 4%with an increase of relative energy loss by a small value. The increase of relative baffles block height increases the optimum relative height of drop (w/y1=6), and the relative energy loss .For two consecutive drops it was found that the most value of energy loss takes place in the second basin. The presences of end sill at the end of second basin increases the performance of second basin by small value approximately 5%. It is also shown that increasing the relative height of baffles blocks lead to increases in the relative energy loss (within the ranges considered in this study), and the optimum relative baffle block height hb/y1=0.77 to 1.7 and bed slope is 1/50.

عملية الحفر في المناطق اسفل المنشآت الهيدروليكية واحدة من اهم العوامل التي تؤثر على استقرارية وتشغيل تلك المنشآت. الطاقة المتولدة الكبيرة في منطقة اسفل المنشاءات يجب ان يتم السيطرة عليها. لذلك يجب تصميم منشأت التشتت لتبديد هذه الطاقة الكبيرة والحد من اعمال الحفر المرافقة لها. احواض التهدئة ذات المهابط الاحادية او المتعددة واحدة من تلك المنشاءات المستخدمة. في الدراسة الحالية تم استخدام النماذج المختبرية لأحواض تهدئة مختلفة الابعاد احادية المهبط و ثنائية المهابط المتعاقبة. كما وتم دراسة تأثير استخدام العتبات النهائية و المصدات بمختلف الاحجام والميول في احواض التهدئة. المتغيرات الهيدروليكية المصاحبة لجريان الماء في تلك الاحواض تم قياسها باستخدام قناة جريان مفتوحة مجهزة في مختبر الموائع في قسم الهندسة المدنية / كلية الهندسة / جامعة قاريونس. النتائج اثبتت ان استخدام العتبة النهائية قد قللت طول القفزة الهيدروليكية بنسبة 4% مع زيادة بسيطة في فقدان الطاقة. زيادة ارتفاع المصادات تسهم في زيادة التشتت وفقدان الطاقة وكذلك في زيادة الارتفاع المثالي للمهبط (العرض/الارتفاع = 6). في حالة المهابط الثنائية وجد ان فقدان الطاقة الاكبر يكون في المهبط الثاني. وجود العتبة النهائية في المهبط الثاني يزيد من قابلية حوث التهدئة بتشتيت الطاقة وبنسبة 5% تقريبا. وكذلك وجد ان زيادة ارتفاع المصدات يزيد من قابلية التشتت تحت ظروف التجارب المستخدمة تحت المحددات التالية:(optimum relative baffle block height hb/y1=0.77 to 1.7 and bed slope is 1/50)


Article
Hydrotalcite; porous membrane; carbon dioxide capture; response surface methodology.

Authors: Qassem H. Jalut قاسم حميد جلعوط --- Nisreen J. Rasheed نسرين جواد رشيد
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2018 Volume: 11 Issue: 3 Pages: 47-53
Publisher: Diyala University جامعة ديالى

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Abstract

Various protection methods can be used for protecting the pipeline system from the impact of water hammer. Which includes the use of special materials for supporting the pipeline and the installation of special devices such as surge tanks, relief valves, and air chambers. In this study, to protect the pipeline system and reduce the effect of water hammer, surge tank has been used. Governing equations of transient flow with and without surge tank is numerically simulated using MATLAB software. Sensitivity analysis was investigated using several variables such as pipe diameter, wave’s velocity and friction factor. Method of characteristics (MOC) was implemented in this study. It was found that the diameter and friction factor of pipe have a significant impact on the results of transient flow and surge tank compared to the effect of wave’s velocity. It has been reached that the capacities of surge tanks at diameter (1m), are (1475m3) at first, second and fourth stages, (1360m3) at third and fifth stages and (570m3) at sixth stage. And at diameter (1.2m), the capacities are (1700m3), (1530m3) and (1475m3) at first, second and third stages respectively. But at diameter (1.4m), the capacities are (1590m3) at first and second stages. For all values of wave’s velocity, the capacities of surge tanks are (1760m3), (1530m3) and (1420m3) at first, second and third stages respectively. But the capacities of surge tanks at friction factor (0.007) are (1810m3), (1585m3) and (1245m3) at first, second and third stages respectively. However, for the capacity of surge tanks at the friction factor (0.008), it was mentioned when the surge tanks capacity of the diameter (1.2m) was mentioned. And when the friction factor is (0.009), the capacities are (1460m3) at first stage, (1415m3) at second and third stages and (570m3) at fourth stage.


Article
Hydrologic Modeling for Sedimentation in Hemrin Reservoir Using HEC-HMS

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Abstract

Hemrin dam is an important dam in Iraq located on Diyala river which is considered as main tributary of Tigris. The sedimentation is very difficult problem and is considered the major problem affecting the utilization of the dam. HEC-HMS 4.1 software was used to made a simulation for sedimentation in Hemrin reservoir in order to estimate the amount of sediment entering and deposition in the reservoir for the period (1981-2014). The calibration processes were performed using field measurement data for flow of water from Diyala river, the result obtained from simulation process found that the average annual sediment discharge load to Hemrin reservoir is ( 3.43x〖10〗^6 Ton), while the average annual sediment deposited is (3.25x〖10〗^6 Ton).

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