This module explores ocean acoustics, focusing on the propagation and detection of sound in the marine environment. Sound propagation strongly depends on refraction caused by variations in sound speed, and reflection off the seafloor and sea surface. Detection of sound subsequently depends on its propagation path, background noise from human and natural sources, and the sensors used for detection.
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lucymatth
2020-01-21 20:43:13
I have no experience in ocean acoustics and found this to be a very useful, detailed and challenging course. It took me much longer than 2 hours!
Aldrin V
2018-11-27 09:40:33
good job.
Manolo9594
2018-11-27 09:35:09
It´s ok.
Marguetac212
2018-11-26 12:51:00
exelente informacion
belmin8698
2018-10-17 13:26:59
todo es cuestion de dedicación
bill_barley@nps.gov
2018-09-16 10:28:23
A good course.
Erik R. Sanchez
2018-06-29 21:31:03
excelente aprendizaje
hectoro
2018-06-21 22:18:09
me parecio execelente
Samayoa Panameño
2018-06-20 22:12:06
buen aporte
myronmontoya
2018-06-20 21:49:52
jjjl
RRR
2018-06-18 10:08:49
Is very importand, I hope the next be in spanish. Congratulations.
Dra. Verónica Chapeton
2018-06-16 15:45:48
Académicamente es necesario que la lectura e interpretación de mapas, tenga lección particular, y de ser posible recomendaría Foro interactivo, a manera de televideo conferencias.
Deyvin R. Ajbal
2018-06-15 22:17:25
contenido de gran utilidad y de seguridad en la navegacion
MarioRod
2018-06-15 17:38:07
Fue un reto satisfactorio , agradezco la complejidad.
JoseNajera79
2018-06-14 22:41:23
Excellent!!
Lesbia Morales
2018-06-14 16:08:54
the whole course seems great
Diaz.G.
2018-06-13 22:36:27
Esta clase fue un poco mas didactica
KAIBIL-1161
2018-06-12 00:58:32
Very difficult and my personal opinion all knowledge very interesting.
fedecastillo
2018-06-11 14:58:28
thaks
valenciachico
2018-06-06 15:15:31
strongly agree
navegante7934
2018-06-06 00:58:30
nice lesson
navegante7934
2018-06-06 00:39:39
excelent
Ricardo Suacor
2018-06-04 15:57:45
complicado por que no se me facilita el ingles, pero buen tema.
cmauricio74
2018-06-04 15:57:28
i like is very nice
Miguel Toralla
2018-05-25 22:03:19
none
MarceloEduardo
2018-03-29 06:10:36
excellent
CRISTIAN GUALPA 92
2018-03-28 06:30:51
muy buena información
Cristhian Garces
2018-03-27 21:11:53
tuvo un grado de dificultad superior.
oladotunonas
2017-10-01 08:09:55
the lesson is very educative and has the ability to increase the knowledge based of students
rbgordonus
2017-09-17 13:28:58
This is an excellent course. It will definitely help me to better teach this subject to my students.
andrewmarvinmeyer1
2017-09-16 11:37:30
It was long.
obrienm
2017-08-28 13:31:45
I don't have a background in acoustics. For an introduction course, I found it to be very overwhelming. There are just SO many aspects to it. I think that refraction in comparison to sound velocity profiles and gradients needs to be explained more.
denis.karamagi@usm.edu
2017-07-03 17:31:53
A Great "Introduction to Ocean Acoustics"
jessica.mihailin
2017-06-26 12:48:37
n/a
reddickj
2017-06-19 07:59:38
I took this quiz to compare it with the exam offered on Navy E-Learning's "Acoustics and Sound Ray Theory" course. I scored almost identical grades, and found the key elements to be very similar. Recommend this course if you cannot access the Navy E-Learning courses.
NParks
2017-06-08 12:05:36
The links to the sound clips for AN do not work/take you to the correct place.
jmike77
2017-05-10 09:13:05
se puede aprender y mejor lecciones aprendidas sobre el tema de acustica
Cayuma
2017-03-20 09:00:32
Excellente
gjg1970
2017-01-19 09:28:10
List of terms and definitions would be helpful. More examples and sample quiz questions during lesson phases would improve comprehension.
tono22
2017-01-10 11:17:26
es algo confuso pero al entrar bien a la lección se va comprendiendo
LotharIrausquin
2016-12-14 11:38:41
Very good module
Nada2
2016-12-05 14:18:48
it;s quiz completely helpful
Nada2
2016-12-05 13:45:44
good quiz
wajielnino
2016-11-26 05:55:45
Excellent Course ! Loved it
jajuarez
2016-10-30 16:38:16
nice course!!
lcpazevedo
2015-11-23 03:19:04
Excelente curso de introdução sobre acústica submarina. Como submarinista, sempre recomendo aos meus alunos e aos engenheiros que trabalham com submarinos. Agradeço à University Corporation for Atmospheric Research's pela disponibilzação gratuita do curso.
BJJennrich
2014-01-29 07:20:50
I like and learn from the class but it took me more than 2 hours. My background is geography not oceanography. I work as a cartographer in the maritime office.
After completing the module, the learner should be able to do the following:
Physics of sound propagation
Explain why sound is a pressure wave
List and describe the important characteristics of sound waves
Describe the relationship between sound pressure and sound intensity
Sound Speed
List the factors that affect underwater sound speed (temperature, salinity, pressure)
Describe how sound speed changes with changes in temperature, salinity, and pressure
Describe typical sound speed profiles in the world's oceans and major marginal seas
Refraction and Reflection
Given a sound speed profile, describe how sound will refract
Describe the relationship between refraction and frequency
Describe the factors that affect sound reflection off of the seafloor or sea surface
Propagation Paths
Describe the surface duct, mixed layer, and sonic layer depth and their interrelationship
Describe sound propagation in the surface duct
Describe the conditions that lead to sound channels
Describe the deep and secondary sound channels
Describe the convergence zone
Describe factors that lead to bottom bounce
Ocean Structures
Describe how sound propagation is affected by oceanic fronts and eddies
Sources of Change in Ocean Acoustic Features
Describe seasonal and diurnal effects on ocean sound speed profiles
Describe the effect of large storms on ocean sound speed profiles
Describe the effect of internal waves and tides on sound propagation
Scattering and Absorption
Describe the factors that affect scattering and absorption of sound at the seafloor
Describe how bathymetry affects scattering and sound propagation
Describe how seawater absorbs sound energy
Describe how air bubbles affect sound propagation
Factors Affecting Detection of Sound
List the factors that affect the detection of sounds under water
List sources of ambient noise in the ocean
Describe the difference between spherical and cylindrical spreading of sound waves
Describe how sound propagation paths affect the detection of sound sources
Sensors
Explain the difference between active and passive sonar systems
Describe the strengths and weaknesses of active and passive sonar systems
Describe the factors that determine target strength
SONAR Equation (Advanced Topic)
List the variables in the sonar equation
Recall the difference in the sonar equation for active and passive systems
Describe the Figure of Merit (FOM)
Sound, propagation, refraction, reflection, scattering, reverberation, absorption, sound speed profile, surface duct, mixed layer, sonic layer depth, sound channel, convergence zone, bottom bounce, spherical spreading, cylindrical spreading, sonar