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Register a new userStudy of artificial ventilation pipes in closed drains " bottom outlets of Tal-Hosh and Zeta dam model "
دراسة أنانبيب التهوية الاصطناعية في المصارف المغلقة " مفرغا سدي تل حوش وزيتا أنموذجاً "
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Aِl-Baath University رسالة ماجستير
Publication date
2019
and research's language is
العربية
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أثناء جريان الماء في المصارف المغلقة بسرعات عالية يمكن أن ينخفض الضغط إلى القيمة التي تسبب ظاهرة الغليان البارد وما يتبعها من تشكل جيوب تكهفية خطرة كما تؤدي السرعات العالية إلى جذب الهواء المحيط وبالتالي حدوث ظاهرة التهوية التلقائية التي تلعب دوراً معاكساً لظاهرة التكهف ضمن بنية التيار , ودوراً سلبياً في إحداث جيوب تكهفية فوق سطح الماء.
During the flow of water in closed drains at high speeds, the pressure can drop to the value that causes the phenomenon of cold boiling and the subsequent formation of dangerous cavitational pockets. High speeds also lead to the attraction of the surrounding air and thus the occurrence of the phenomenon of spontaneous ventilation, which plays an opposite role to the phenomenon of cavitation within the structure of the stream, and a role Negatively in the creation of cavernous pockets above the surface of the water.
References used
Paulo C.F Erbisti, 2014 - Design of Hydaulic Gates . Consulting engineer UK London , Second Edition , P251-262
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دراسة أنابيب التهوية الاصطناعية في المصارف المغلقة " مفرغا سدي تل حوش وزيتا أنموذجاً " : نصادف في المصارف المغلقة ذات الضاغط العالي نماذج خطرة للجريان تتجلى في سرعاتهاالعالية وما يرافقها من تغير البنية الهيدروليكية للتيار
Joints study in Skhaba region shows the existence two joint directions, principal dominant
NW-SE Joints from extension origin upper Cretaceous age, unrelated and older than faults
in studied area statistically, the presence of Calcareous filling in
the joints that is supported
the extension origin in the first phase. Secondary NE-SW joints from Miocen-Pliocen in
age, and from extension origin ,related to the formation of faults, most of them contain thin
iron crust in secondary phase.
This search shows the lithological, petrographical and physical properties of the dam,
and storage basin through rocks cors study taken from some wells in axis dam and storage
lake and surface samples therefore have shaped unpenetration and penetra
tion units. From
this study discern reduction degree pored with rise positions deep far from range
movement underground water and observed attachment pored grade cracs, Faults and
karstic, Karstic discerned in positions (campanian, turounian) Increase Karstic caves in
sinomanian positions from during tectonic cracs and naught being it in mastrichtian also
action space in area dry weathering above level underground water because movement
water across this cracs and vacuity.
Positions geological divided in location which credence at pored to three straps
(A, B, C):
A)-Hard weathering strap Positions assimilate in this strap cracs dense rocks advance
open cracs wobble between(3-5mm) and full of habit clay materials ,and compose dense
weathering strap assimilate pored rocks and area the thick (3-6m).and advance removal it
before starting in construction dam body because low resistance ,high cracs, capacity low
load
B) -Soft weathering strap Assimilate debris pile from split calcite rocks,and
compose penetrating rocks.
C) -Unpenetrating rocks strip Assimilate thick clay calcite positions from
unpenetrating rocks.
This study was achieved through Mars 2011 until February 2012 the samples collected monthly from Baksa dam from different four location which differenced each other with chemical and physical qualities.
We could in these study classified 132 speci
es of phytoplankton distributed as 59 species belong to chrysophyta, 40 species of chlorophyta and 28 species of cyanophyta , 5 species of Euglenophyta.
Physical and chemicalanalyzing ofBaksa waters showed the difference of values between studding regions, The concentration of Nitrate ions ranged between 17.7 mg/l at third location and 0.3 mg/l at second location, The highest rate to Phosphate ions was 18.8 mg/l and the less was 0.01mg/l, and it was noticed the difference in these values in the same region with the difference of period of time.
The diversity and distribution of studied phytoplankton correlated with the environmental factors.
It was noticed The abundance of cyanophytain the water of third location which near to the sewage channels which is suitable environment to these group of phytoplankton.
This research aims to study the distribution of Phytoplankton in four locations which have different environmental specifications, in addition to study some environmental factors of Alhaffeh Dam water that affect the distribution of the phytoplankt
on (Temperature ,BOD, DO, pH, NO3, NO2, NH4, PO4). Samples were collected from different locations of the Dam basin from June 2011 to May 2012 once or twice a month. (84) species of Phytoplankton were identified and were distributed as: (38) species of Chrysophyta, (36) species of Diatomophyceae, (2) species of Chrysophycea, (25) species of Chlorophyta, (20) species of Cyanophyta, (2) species of Pyrrhophyta, and (5) species of Euglenophyta. The results show apparent changes in physical and chemical properties of water during this study. This is the first study of the phytoplankton on the water of Alhaffeh Dam.
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