A Developed analytical model for dispersion of effluent discharges under tidal oscillations

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

Dispersion of effluent discharges from sea outfalls has many potential environmental impacts on coastal zones. Understanding the dispersion process is critical to managing these impacts and can provide a useful way to minimize undesirable consequences. Besides several factors, tidal currents and depth topography play important roles in the dispersion of discharged effluent in the far-field region. Some important and complicated situations arise when the coastal flow changes direction due to tidal reversal. The effect of depth topography is due to the fact that the dispersion process is more efficient in deep water, and effluent discharges are more likely to be retained in shallower regions. The main objective of this thesis is to employ a mathematical model for the dispersion of effluent discharges under tidal oscillation currents on a sloping beach, using a two-dimensional, time-dependent advection-diffusion equation. The steady effluent discharges are assumed to be released from a point source to model a port of the sea outfall into well-mixed waters. A simple sinusoidal formulation has been used to express tidal oscillation; however, tides and tidal currents are more complicated and often contain oscillations of two (or more) different frequencies that create a spring-neap tidal cycle. Many field observations have reported the vital role played by the spring-neap tidal current. In this study, the spring-neap tidal current formulation is deployed to represent tidal oscillation in coastal areas. A time-varying discharge strategy and compounded concentration from two outfalls—and via a two-port diffuser as well—are included in this investigation as practical engineering applications of the model. For a uniformly sloping beach, the cross-shore current velocity and turbulent dispersivity are considered as functions of water depth and approximated by power laws. The separation of variables approach was applied to derive a pair of one-dimensional advection-diffusion equations. In the x-direction, the equation is solved analytically using the Fourier transform, while in the y-direction, with spatially variable velocity and dispersion coefficient, the Laplace transform is employed to obtain the solution. The analytical solution is presented graphically by contour plots of concentration to visualize the dispersion of effluent discharges in coastal waters. The concentration at the shoreline and at the centerline of the plume is examined by varying the model parameters.

روابط وملفات

التعريف والنوع

رقم الوثيقة

f427ce63-b867-4116-a4a5-081a519e1ba9

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

f427ce63-b867-4116-a4a5-081a519e1ba9_1.pdf

بيانات النشر

ترجمة العنوان

نموذج رياضي تحليلي مطور لنمذجة تشتت النفايات السائلة التي يتم تصريفها في مياه البحر تحت تأثير المد والجزر

ألقاب المؤلفين

[{"name_ar":" Ahmed Ali Hamed Al-Kasbi ","title_ar":"اعداد","title_en":"Preparation"},{"name_ar":"Anton Purnama ","title_ar":"اشراف","title_en":"Supervision"}]

اللغة

English

المصدر والدورية

اسم المصدر

A Developed analytical model for dispersion of effluent discharges under tidal oscillations

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

Water pollution--Mathematical models--Oman Pollution -Mathematical models- Oman

إشراف وإعداد

الإشراف

Anton Purnama

الإعداد

Ahmed Ali Hamed Al-Kasbi

الاقتباسات الببليوغرافية