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Kum, B.-C.; Shin, D.-H.; Jang, S.; Lee, S.Y.; Lee, J.H.; Moh, T.J.; Lim, D.G.; Do, J.-D., and Cho, J.H., 2020. Application of unmanned surface vehicles in coastal environments: Bathymetric survey using a multibeam echosounder. In: Malvárez, G. and Navas, F. (eds.), Global Coastal Issues of 2020. Journal of Coastal Research, Special Issue No. 95, pp. 1152-1156. Coconut Creek (Florida), ISSN 0749-0208. This paper presents the practical application and results of a bathymetric survey carried out in a shallow marine coastal zone (Hujeong beach, located in the East Sea, South Korea) using a multi-functional unmanned surface vehicle (USV) equipped with a multibeam echosounder. Operation of the USV was conducted along the coast in very shallow water [depth ≤ 1.5 m (0.3 m below the transducer)], which is inaccessible to manned research vessels. High-resolution bathymetric data is expected to help with assessment and prediction of rapid changes in the shallow coastal zone. This work supports the applicability of USVs to scientific research and environmental monitoring in very shallow coastal areas. The USV will be the most extensively used technique for observing marine coastal environment. [ABSTRACT FROM AUTHOR]

ABSTRACT Jeong, H.; Ra, K.; Kim, K.-T.; Kim, E.-S.; Lee, S.-Y., and Choi, M.-S. 2018. Tracing the pollution source using Pb isotopes in sediments of the coastal region surrounding the national industrial complex, Korea. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 1456–1460. Coconut Creek (Florida), ISSN 0749-0208. 166 sediment samples from Ulsan Bay and Shihwa Lake that is special management sea area were collected in 2014 not only to study the spatial distribution and pollution assessment of Pb but also to identify anthropogenic pollutions for Pb isotopes. The mean Pb concentrations of road-deposited sediments were higher than those of stream and coastal sediments in the study area. In all sediment samples, Ulsan showed an average concentration of 2 to 4 times higher than that of Shihwa. Pb concentrations in coastal sediments of more than 50 % were below the threshold effect level (TEL) of Korean marine sediment quality guidelines. The high exceedance of probable effect levels (PEL) showed in large harbors and near industrial facilities. Road-deposited sediments in Ulsan and Shihwa exceeded the class 2 (potentially toxic to benthic organisms) of Korean freshwater sediment quality guidelines. For both study areas, Pb isotope ratios tend to decrease with increasing Pb concentrations in sediments. In the case of Ulsan, high concentrations and low 206Pb/207Pb isotopic ratios were observed nearby the smelter and lead ore import harbor, indicating that Pb was released into the road surface during transportation using the vehicle and then moved to the marine area through the stream. However, Shihwa has a lot of small facilities (>19,000), it is difficult to clearly identify Pb pollution sources. [ABSTRACT FROM AUTHOR]

ABSTRACT Kum, B.-C.; Shin, D.-H.; Lee, J.H.; Moh, T.J.; Jang, S.; Lee, S.Y., and Cho, J.H., 2018. Monitoring Applications for Multifunctional Unmanned Surface Vehicles in Marine Coastal Environments. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 1381–1385. Coconut Creek (Florida), ISSN 0749-0208. This work investigates the application of unmanned surface vehicles (USVs) for the management of coastal environment. USVs are an important and highly accessible tool for operating in shallow and nearshore waters. Sea trials are used to test the maneuverability and bathymetric survey capabilities of USVs. The results show that USVs have the potential to be an integrative platform for surveying shallow water zones (rivers, estuaries, and coasts), which can be enhanced by installing various transducers and sensor modules. The advances in sensing technologies and microelectronics will lead to the miniaturization of sensors and devices resulting in the proliferation of USVs in the field of coastal management. [ABSTRACT FROM AUTHOR]