Backwash

Backwash

The return flow of water down a beach after a wave has broke

Swash, in geography, is known as a turbulent layer of water that washes up on the beach after an incoming wave has broken. The swash action can move beach materials up and down the beach, which results in the cross-shore sediment exchange.[1] The time-scale of swash motion varies from seconds to minutes depending on the type of beach (see Figure 1 for beach types). Greater swash generally occurs on flatter beaches. [2] The swash motion plays the primary role in the formation of morphological features and their changes in the swash zone. The swash action also plays an important role as one of the instantaneous processes in wider coastal morphodynamics.

Figure 1. Beach classification by Wright and Short (1983) showing dissipative, intermediate, and reflective beaches.

There are two approaches that describe swash motions: (1) swash resulting from the collapse of high-frequency bores (f>0.05Hz) on the beachface; and (2) swash characterised by standing, low-frequency (f<0.05Hz) motions. Which type of swash motion prevails is dependant on the wave conditions and the beach morphology and this can be predicted by calculating the surf similarity parameter εb (Guza & Inman 1975)

$epsilon b = frac{4 pi ^2Hb}{2gT^2tan^2 eta},$

Where Hb is the breaker height, g is gravity, T is the incident-wave period and tan β is the beach gradient. Values εb>20 indicate dissipative conditions where swash is characterised by standing long-wave motion. Values εb<2.5 indicate reflective conditions where swash is dominated by wave bores.[3]

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For CE 370 students : Your second midterm exam will be on Wednesday 27 March 2019. In the surveying lab

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Mining Engineering

Mining engineering is an engineering discipline that involves practice, theory, science, technology, and the application of extracting and processing minerals from a naturally occurring environment. Mining engineering also includes processing minerals for additional value.

Environmental Engineering

Environmental engineers are the technical professionals who identify and design solutions for    environmental problems. Environmental engineers provide safe drinking water, treat and properly dispose of wastes, maintain air quality, control water pollution, and remediate sites contaminated due to spills or improper disposal of hazardous substances. They monitor the quality of the air, water, and land. And, they develop new and improved means to protect the environment.

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Universities I've worked in

Assuit University (Home University), Egypt

Imperial College, London, UK

King Saud University, KSA

,Majmaah University

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Course 2018/19-2

1. Surveying 1 CE 370
2. Surveying II  CE 371
3. Senior Design II  (round 6) CE 499

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Member of the Editorial Board: " Journal of Water Resources and Ocean Sciences"  2013 till now

Participating in The Third International Conference on Water, Energy and Environment,(ICWEE) 2019 - American University of Sharjah, UAE 26-28 March 2019 with a Paper and Poster

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2nd Midterm Exams on 3/4/2019

Student Conference

Participation  in the 6Th Student Conference

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From the Senior Design Project CE499 -35

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2018-2019S

 Power point Sheets Lecture notes 15 3-4-2019 :Second Midterm Exam Results Model Answer

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2018-2019-2

 Lectures First midterm exam Lab Results

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Photogrammetry

2018-2019-1

 Available 0-1-2-3-4 Power point Available Quizzes 2 and 3 with model Answer Quizzes Available Chapter 1,2,3,4,5 Lecture notes Report 1  Cameras Report Y 60 marks Exams

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Student Performance Records

CE 499 Course

Second Best paper from Senior Design Projects in 2015

Paper title:

Evaluation of Groundwater Quality Parameters using Multivariate Statistics- a case Study of Majmaah, KSA

Students:

Abdullah A. Alzeer

Husam K. Almubark

Maijd M. Almotairi

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