Anthropogenic Noise

Mapping Snapping Shrimp Noise in the Indian Ocean Region: Impact on Sonar

OCEAN AMBIENT NOISE IS USUALLY CONSIDERED AS AN INTERFERING BACKGROUND FOR UNDERWATER ACOUSTIC SYSTEMS. THESE SOUNDS HAVE A SERIOUS EFFECT ON SONAR. FROM LOW FREQUENCY BAND (10HZ-500HZ) TO MID-FREQUENCY RANGE (500HZ-25KHZ), MARINE ANIMALS SIGNIFICANTLY INCREASES OCEAN AMBIENT NOISE. RESULTS REVEAL THAT BIOLOGICAL NOISE FROM MARINE INVERTEBRATES LIKE SNAPPING SHRIMPS DROPS DETECTION RANGE FROM 35 KM…

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1280 853 Maritime Research Center

Shipping Radiated Noise Estimation Using AI

/*! elementor - v3.5.5 - 03-02-2022 */ .elementor-alert{padding:15px;border-left:5px solid transparent;position:relative;text-align:left}.elementor-alert .elementor-alert-title{display:block;font-weight:700}.elementor-alert .elementor-alert-description{font-size:13px}.elementor-alert button.elementor-alert-dismiss{position:absolute;right:10px;top:10px;padding:3px;font-size:20px;line-height:1;background:transparent;color:inherit;border:none;cursor:pointer}.elementor-alert.elementor-alert-info{color:#31708f;background-color:#d9edf7;border-color:#bcdff1}.elementor-alert.elementor-alert-success{color:#3c763d;background-color:#dff0d8;border-color:#cae6be}.elementor-alert.elementor-alert-warning{color:#8a6d3b;background-color:#fcf8e3;border-color:#f9f0c3}.elementor-alert.elementor-alert-danger{color:#a94442;background-color:#f2dede;border-color:#e8c4c4}@media (max-width:767px){.elementor-alert{padding:10px}.elementor-alert button.elementor-alert-dismiss{right:7px;top:7px}} Authors Aviral Tyagi, Shridhar Prabhuraman (MRC) and Dr (Cdr) Arnab Das (MRC) /*! elementor - v3.5.5 - 03-02-2022 */ .elementor-widget-social-icons.elementor-grid-0 .elementor-widget-container,.elementor-widget-social-icons.elementor-grid-mobile-0 .elementor-widget-container,.elementor-widget-social-icons.elementor-grid-tablet-0 .elementor-widget-container{line-height:1;font-size:0}.elementor-widget-social-icons:not(.elementor-grid-0):not(.elementor-grid-tablet-0):not(.elementor-grid-mobile-0) .elementor-grid{display:inline-grid}.elementor-widget-social-icons 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1280 853 Maritime Research Center

Low frequency Shipping Ambient Noise Mapping for Passive Sonar Simulator

/*! elementor - v3.5.5 - 03-02-2022 */ .elementor-alert{padding:15px;border-left:5px solid transparent;position:relative;text-align:left}.elementor-alert .elementor-alert-title{display:block;font-weight:700}.elementor-alert .elementor-alert-description{font-size:13px}.elementor-alert button.elementor-alert-dismiss{position:absolute;right:10px;top:10px;padding:3px;font-size:20px;line-height:1;background:transparent;color:inherit;border:none;cursor:pointer}.elementor-alert.elementor-alert-info{color:#31708f;background-color:#d9edf7;border-color:#bcdff1}.elementor-alert.elementor-alert-success{color:#3c763d;background-color:#dff0d8;border-color:#cae6be}.elementor-alert.elementor-alert-warning{color:#8a6d3b;background-color:#fcf8e3;border-color:#f9f0c3}.elementor-alert.elementor-alert-danger{color:#a94442;background-color:#f2dede;border-color:#e8c4c4}@media (max-width:767px){.elementor-alert{padding:10px}.elementor-alert button.elementor-alert-dismiss{right:7px;top:7px}} Authors Krishna Pranay Reddy Chennareddy, BITS Pilani and Dr. (Cdr) Arnab Das, MRC, Pune /*! elementor - v3.5.5 - 03-02-2022 */ .elementor-widget-social-icons.elementor-grid-0 .elementor-widget-container,.elementor-widget-social-icons.elementor-grid-mobile-0 .elementor-widget-container,.elementor-widget-social-icons.elementor-grid-tablet-0 .elementor-widget-container{line-height:1;font-size:0}.elementor-widget-social-icons:not(.elementor-grid-0):not(.elementor-grid-tablet-0):not(.elementor-grid-mobile-0) .elementor-grid{display:inline-grid}.elementor-widget-social-icons .elementor-grid{grid-column-gap:var(--grid-column-gap,5px);grid-row-gap:var(--grid-row-gap,5px);grid-template-columns:var(--grid-template-columns);-webkit-box-pack:var(--justify-content,center);-ms-flex-pack:var(--justify-content,center);justify-content:var(--justify-content,center);justify-items:var(--justify-content,center)}.elementor-icon.elementor-social-icon{font-size:var(--icon-size,25px);line-height:var(--icon-size,25px);width:calc(var(--icon-size, 25px) + (2 * var(--icon-padding, .5em)));height:calc(var(--icon-size, 25px) + (2 * var(--icon-padding, .5em)))}.elementor-social-icon{--e-social-icon-icon-color:#fff;display:-webkit-inline-box;display:-ms-inline-flexbox;display:inline-flex;background-color:#818a91;-webkit-box-align:center;-ms-flex-align:center;align-items:center;-webkit-box-pack:center;-ms-flex-pack:center;justify-content:center;text-align:center;cursor:pointer}.elementor-social-icon i{color:var(--e-social-icon-icon-color)}.elementor-social-icon…

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1280 853 Maritime Research Center

Analysis of Underwater Radiated Noise Based On Vessel Hull Vibrations

Pollution in the ocean is not just about the dumping of harmful chemical, physical orbiological substances into the sea, but also about the increased ambient noise. Ocean ambient noise results from both natural and anthropogenic(human-induced) acoustic sources. The latter are closely related to maritime shipping and seismic exploration by the oil/gas industry.

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1280 853 Maritime Research Center

3D Shipping Radiated Noise Mapping

/*! elementor - v3.5.5 - 03-02-2022 */ .elementor-alert{padding:15px;border-left:5px solid transparent;position:relative;text-align:left}.elementor-alert .elementor-alert-title{display:block;font-weight:700}.elementor-alert .elementor-alert-description{font-size:13px}.elementor-alert button.elementor-alert-dismiss{position:absolute;right:10px;top:10px;padding:3px;font-size:20px;line-height:1;background:transparent;color:inherit;border:none;cursor:pointer}.elementor-alert.elementor-alert-info{color:#31708f;background-color:#d9edf7;border-color:#bcdff1}.elementor-alert.elementor-alert-success{color:#3c763d;background-color:#dff0d8;border-color:#cae6be}.elementor-alert.elementor-alert-warning{color:#8a6d3b;background-color:#fcf8e3;border-color:#f9f0c3}.elementor-alert.elementor-alert-danger{color:#a94442;background-color:#f2dede;border-color:#e8c4c4}@media (max-width:767px){.elementor-alert{padding:10px}.elementor-alert button.elementor-alert-dismiss{right:7px;top:7px}} Authors Rijul Dhingra, BITS, Pilani; Dr (Cdr) Arnab Das, MRC, Pune; P. Shridhar, MRC, Pune /*! elementor - v3.5.5 - 03-02-2022 */ .elementor-widget-social-icons.elementor-grid-0 .elementor-widget-container,.elementor-widget-social-icons.elementor-grid-mobile-0 .elementor-widget-container,.elementor-widget-social-icons.elementor-grid-tablet-0 .elementor-widget-container{line-height:1;font-size:0}.elementor-widget-social-icons:not(.elementor-grid-0):not(.elementor-grid-tablet-0):not(.elementor-grid-mobile-0) .elementor-grid{display:inline-grid}.elementor-widget-social-icons .elementor-grid{grid-column-gap:var(--grid-column-gap,5px);grid-row-gap:var(--grid-row-gap,5px);grid-template-columns:var(--grid-template-columns);-webkit-box-pack:var(--justify-content,center);-ms-flex-pack:var(--justify-content,center);justify-content:var(--justify-content,center);justify-items:var(--justify-content,center)}.elementor-icon.elementor-social-icon{font-size:var(--icon-size,25px);line-height:var(--icon-size,25px);width:calc(var(--icon-size, 25px) + (2 * var(--icon-padding, .5em)));height:calc(var(--icon-size, 25px) + (2 * var(--icon-padding, .5em)))}.elementor-social-icon{--e-social-icon-icon-color:#fff;display:-webkit-inline-box;display:-ms-inline-flexbox;display:inline-flex;background-color:#818a91;-webkit-box-align:center;-ms-flex-align:center;align-items:center;-webkit-box-pack:center;-ms-flex-pack:center;justify-content:center;text-align:center;cursor:pointer}.elementor-social-icon…

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1280 853 Maritime Research Center

Mapping Snapping Shrimp Noise in the Indian Ocean Region

The snapping shrimp colonize warm littoral waters throughout the tropical and sub-tropical zones of the earth. The peak-to-peak source levels of a single shrimp snap have been recorded to be as high as 180 dB re 1μPa at 1m (louder than a jet at 140dB). Moreover, the combined snaps produced are essentially broadband signals and are observed…

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1280 746 Maritime Research Center
Identification of the Noise hotspots

Radiated Noise Generation

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Pandey and Dr(Cdr) Arnab Das /*! elementor - v3.5.5 - 03-02-2022 */.elementor-widget-social-icons.elementor-grid-0 .elementor-widget-container,.elementor-widget-social-icons.elementor-grid-mobile-0 .elementor-widget-container,.elementor-widget-social-icons.elementor-grid-tablet-0 .elementor-widget-container{line-height:1;font-size:0}.elementor-widget-social-icons:not(.elementor-grid-0):not(.elementor-grid-tablet-0):not(.elementor-grid-mobile-0) .elementor-grid{display:inline-grid}.elementor-widget-social-icons .elementor-grid{grid-column-gap:var(--grid-column-gap,5px);grid-row-gap:var(--grid-row-gap,5px);grid-template-columns:var(--grid-template-columns);-webkit-box-pack:var(--justify-content,center);-ms-flex-pack:var(--justify-content,center);justify-content:var(--justify-content,center);justify-items:var(--justify-content,center)}.elementor-icon.elementor-social-icon{font-size:var(--icon-size,25px);line-height:var(--icon-size,25px);width:calc(var(--icon-size, 25px) + (2 * 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.elementor-icon.elementor-social-icon{-webkit-border-radius:10%;border-radius:10%}.elementor-shape-circle .elementor-icon.elementor-social-icon{-webkit-border-radius:50%;border-radius:50%} Twitter Linkedin Overview This paper states…

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