• B. Umarani
• A. R. Naseer

Recent studies in underwater wireless sensor networks (UWSNs) haveattracted the attention of researchers in academia and industry in critical application areas such as catastrophe andearthquake prediction, water high-quality and environment monitoring, leakage and mine detection,army surveillance and underwater navigation. However, the aquatic medium is related tosome of the limitations and demanding situations: lengthy multipath put-off, high interference and noise, harshsurroundings, low bandwidth and restricted battery life of the sensor nodes. These challenges demandresearch techniques and techniques to conquer in an efficient and effective style. The designof efficient and robust routing protocols for UWSNs is one of the promising answers to address those demanding situations. This paper provides a survey on the Variants of Depth-Based routing protocols for UWSNs. These addressed routing protocols fall under the taxonomy of localization-free protocols. These approaches are in addition subdivided in step with the problems they deal with or the majorparameters they employ at some point of routing. In addition, every protocol is described in phrasesof its routing strategy and the problem it addresses and solves. The advantages and limitations of protocols arehighlighted. The description of the routingapproach of each protocol makes its routing operation effortlessly understandable. The demeritsof a protocol present perception into overcoming its flaws infuture investigation. These may result in the foundation of new protocols which can be extra smart, strong and novel withthe preferred parameters recognized.

Underwater wireless sensor networks (UWSNs), UWSN challenges, Depth-based Routing variants, Energy balancing, Network Lifetime

"Survey on Depth-Based RoutingVariantsfor Underwater Wireless Sensor Networks", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 3, page no.377-385, March-2019, Available :http://www.jetir.org/papers/JETIRAU06052.pdf

"Survey on Depth-Based RoutingVariantsfor Underwater Wireless Sensor Networks", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 3, page no. pp377-385, March-2019, Available at : http://www.jetir.org/papers/JETIRAU06052.pdf