{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,16]],"date-time":"2026-02-16T17:26:21Z","timestamp":1771262781978,"version":"3.50.1"},"reference-count":52,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2020,2,23]],"date-time":"2020-02-23T00:00:00Z","timestamp":1582416000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>A tombolo is a narrow belt connecting a mainland with an island lying near to the shore, formed as a result of sand and gravel being deposited by sea currents, most often created as a result of natural phenomena. However, it can also be caused by human activity, as is the case with the Sopot pier\u2014a town located on the southern coast of the Baltic Sea in northern Poland (\u03c6 = 54\u00b026\u2019N, \u03bb = 018\u00b033\u2019E). As a result, the seafloor rises constantly and the shoreline moves towards the sea. Moreover, there is the additional disturbing phenomenon consisting of the rising seafloor sand covering over the waterbody\u2019s vegetation and threatening the city's spa character. Removal of the sand to another place has already been undertaken several times. There is a lack of precise geospatial data about the tombolo\u2019s seafloor course, its size and spatial shape caused by only lowering the seafloor in random places, and the ongoing environmental degradation process. This article presents the results of extensive and integrated geodetic and hydrographic measurements, the purpose of which was to make a 3D model of the phenomena developing in Sopot. The measurements will help determine the size and speed of the geospatial changes. Most of the modern geodetic and hydrographic methods were used in the study of these phenomena. For the construction of the land part of geospatial model, the following were used: photos from the photogrammetric flight pass (unmanned aerial vehicle\u2014UAV), laser scanning of the beach and piers, and satellite orthophotomaps for analysis of the coastline changes. In the sea part, bathymetric measurements were carried out with an unmanned surface vehicle (USV).<\/jats:p>","DOI":"10.3390\/rs12040737","type":"journal-article","created":{"date-parts":[[2020,2,24]],"date-time":"2020-02-24T03:33:43Z","timestamp":1582515223000},"page":"737","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Geospatial Modeling of the Tombolo Phenomenon in Sopot using Integrated Geodetic and Hydrographic Measurement Methods"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6026-306X","authenticated-orcid":false,"given":"Mariusz","family":"Specht","sequence":"first","affiliation":[{"name":"Department of Transport and Logistics, Gdynia Maritime University, Morska 81-87, 81-225 Gdynia, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5631-6969","authenticated-orcid":false,"given":"Cezary","family":"Specht","sequence":"additional","affiliation":[{"name":"Department of Geodesy and Oceanography, Gdynia Maritime University, Morska 81-87, 81-225 Gdynia, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5359-0433","authenticated-orcid":false,"given":"Janusz","family":"Mindykowski","sequence":"additional","affiliation":[{"name":"Department of Marine Electrical Power Engineering, Gdynia Maritime University, Morska 81-87, 81-225 Gdynia, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pawe\u0142","family":"D\u0105browski","sequence":"additional","affiliation":[{"name":"Department of Geodesy and Oceanography, Gdynia Maritime University, Morska 81-87, 81-225 Gdynia, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4224-528X","authenticated-orcid":false,"given":"Romuald","family":"Ma\u015bnicki","sequence":"additional","affiliation":[{"name":"Department of Marine Electrical Power Engineering, Gdynia Maritime University, Morska 81-87, 81-225 Gdynia, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7121-5322","authenticated-orcid":false,"given":"Artur","family":"Makar","sequence":"additional","affiliation":[{"name":"Department of Navigation and Hydrography, Polish Naval Academy, \u015amidowicza 69, 81-127 Gdynia, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,2,23]]},"reference":[{"key":"ref_1","unstructured":"National Academy of Sciences (2014). Climate change: Evidence and Causes, National Academies Press."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"63","DOI":"10.1061\/(ASCE)0733-950X(2000)126:2(63)","article-title":"Shoreline changes behind detached breakwater","volume":"126","author":"Ming","year":"2000","journal-title":"J. Waterw. Port Coast. Ocean Eng."},{"key":"ref_3","first-page":"60","article-title":"Sea shore protection","volume":"1","author":"Szruba","year":"2017","journal-title":"Mod. Eng. Constr."},{"key":"ref_4","unstructured":"United States Army Corps of Engineers (1984). Shore Protection Manual, USACE."},{"key":"ref_5","first-page":"59","article-title":"Analysis of the causes of security risks for port and marine infrastructure. Part three: Structures protecting the sea shore","volume":"28","year":"2013","journal-title":"Works Fac. Navig. Gdyn. Marit. Univ."},{"key":"ref_6","unstructured":"\u0141abuz, T. (2020, January 27). Ways to Protect Sea Shores and Their Impact on the Natural Environment of the Polish Baltic Coast. (In Polish)."},{"key":"ref_7","unstructured":"President of the City of Sopot (2019, June 09). Response to question No. 154\/2016 of 7 December 2016. (In Polish)."},{"key":"ref_8","unstructured":"Mohamed, A.S. (1997). 2D and 1D numerical model simulations for the effect of a single detached breakwater on the shore. [MSc Thesis, Delft University of Technology]."},{"key":"ref_9","unstructured":"Institute of Oceanology of the Polish Academy of Sciences (2019, June 09). Conducting Research and Modeling of the Seafloor and Sea Shore Near the Pier in Sopot. (In Polish)."},{"key":"ref_10","unstructured":"Mangor, K., Dr\u00f8nen, N.K., Kaergaard, K.H., and Kristensen, N.E. (2020, January 27). Shoreline Management Guidelines. Available online: https:\/\/www.dhigroup.com\/marine-water\/ebook-shoreline-management-guidelines."},{"key":"ref_11","unstructured":"Kim, H. (1993). Three-dimensional sediment transport model. [PhD Thesis, University of Liverpool]."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"157","DOI":"10.1016\/0378-3839(88)90003-8","article-title":"A three-dimensional model of suspended particulate sediment transport","volume":"12","author":"Nicholson","year":"1988","journal-title":"Coast. Eng."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Kuroiwa, M., Kamphuis, J.W., Kuchiishi, T., Matsubara, Y., and Noda, H. (2004, January 19\u201324). Medium-term Q-3D coastal area model with shoreline change around coastal structures. Proceedings of the 29th International Conference on Coastal Engineering (ICCE 2004), Lisbon, Portugal.","DOI":"10.1142\/9789812701916_0176"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"179","DOI":"10.1080\/05785634.1986.11924437","article-title":"Numerical prediction model of three-dimensional beach deformation around a structure","volume":"29","author":"Watanabe","year":"1986","journal-title":"Coast. Eng. Jap."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Shimizu, T., Kumagai, T., and Watanabe, A. (1996, January 2\u20136). Improved 3-D beach evolution model coupled with the shoreline model (3D-SHORE). Proceedings of the 25th International Conference on Coastal Engineering (ICCE 1996), Orlando, FL, USA.","DOI":"10.1061\/9780784402429.220"},{"key":"ref_16","unstructured":"J\u00f6rissen, J.G.L. (2001). Strandhoofden Gemodelleerd in Delft3D-RAM: Strandhoofden als Instrument voor het Regelen van het Langstransport. [MSc Thesis, Delft University of Technology]."},{"key":"ref_17","unstructured":"Nam, P.T. (2020, January 27). Numerical Model of Beach Topography Evolution Due to Waves and Currents. Available online: https:\/\/pdfs.semanticscholar.org\/c5af\/bff0cb81a3dff8f2cc3528016c85bb1b1107.pdf?_ga=2.233758174.1954626850.1580128302-234920152.1580128302."},{"key":"ref_18","unstructured":"Kuchiishi, T., Kato, K., Kuroiwa, M., Matsubara, Y., and Noda, H. (2004, January 23\u201328). Applicability of 3D morphodynamic model with shoreline change using a quasi-3D nearshore current model. Proceedings of the 14th International Offshore and Polar Engineering Conference (ISOPE 2004), Toulon, France."},{"key":"ref_19","unstructured":"Roelvink, D., Giles, L., and van der Wegen, M. (2006, January 10\u201313). Morphological modelling of the wet-dry interface at various timescales. Proceedings of the 7th International Conference on Hydroscience and Engineering (ICHE 2006), Philadelphia, PA, USA."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"van Koningsveld, M., van Kessel, T., and Walstra, D.-J.R. (2005, January 4\u20138). A hybrid modelling approach to coastal morphology. Proceedings of the 5th Coastal Dynamics International Conference (CD 2005), Barcelona, Spain.","DOI":"10.1061\/40855(214)46"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"196","DOI":"10.21595\/vp.2017.18673","article-title":"Simulation of tombolo evolution by using CST3D-WA","volume":"12","author":"Kim","year":"2017","journal-title":"Vibroeng. PROCEDIA"},{"key":"ref_22","unstructured":"Sopot City Hall (2020, January 27). 2016: Tombolo Connects the Beach with the Marina. (In Polish)."},{"key":"ref_23","unstructured":"Sopot NaszeMiasto.pl (2020, January 27). Black beach in Sopot? The City Calms down that it\u2019s Temporary. (In Polish)."},{"key":"ref_24","unstructured":"Sopot NaszeMiasto.pl (2020, January 27). Sopot Beach to be Corrected Again. (In Polish)."},{"key":"ref_25","unstructured":"Specht, C., D\u0105browski, P.S., Specht, M., Makar, A., Marchel, \u0141., Sk\u00f3ra, M., Cywi\u0144ski, P., and Szychowski, P. (2020, January 27). Research on the Tombolo Effect of the Marina in Sopot. (In Polish)."},{"key":"ref_26","unstructured":"Tr\u00f3jmiasto.Wyborcza.pl (2020, January 27). A Sand Island has Grown up at the Pier in Sopot. The Sand on the Cliff in Gdynia is Decreasing. (In Polish)."},{"key":"ref_27","unstructured":"Dziennik Ba\u0142tycki (2020, January 27). A cliff slumped in Gdynia. At Or\u0142owska Street Part of the Cliff Slumped. A Search and Rescue Team Worked on Site. There are no Victims. (In Polish)."},{"key":"ref_28","first-page":"572","article-title":"Geology and glaciotectonics of the Or\u0142owo Cliff in Gdynia, northern Poland","volume":"53","author":"Kaulbarsz","year":"2005","journal-title":"Geol. Rev."},{"key":"ref_29","first-page":"201","article-title":"Nature reserve K\u0119pa Red\u0142owska","volume":"12","author":"Szukalski","year":"1997","journal-title":"Ann. Gdyn."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"85","DOI":"10.1127\/pfg\/2016\/0289","article-title":"A comparison of UAV- and TLS-derived plant height for crop monitoring: Using polygon grids for the analysis of Crop Surface Models (CSMs)","volume":"2","author":"Bareth","year":"2016","journal-title":"Photogramm. Fernerkund. Geoinf."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"246","DOI":"10.1139\/juvs-2015-0043","article-title":"Comparison of SfM computer vision point clouds of a landslide derived from multiple small UAV platforms and sensors to a TLS based model","volume":"4","author":"Ruggles","year":"2016","journal-title":"J. Unmanned Veh. Syst."},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Xiong, L., Wang, G., Bao, Y., Zhou, X., Wang, K., Liu, H., Sun, X., and Zhao, R. (2019). A rapid terrestrial laser scanning method for coastal erosion studies: A case study at Freeport, Texas, USA. Sensors, 19.","DOI":"10.3390\/s19153252"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"00020","DOI":"10.1051\/e3sconf\/20186300020","article-title":"Low cost real time UAV stereo photogrammetry modelling technique\u2014Accuracy considerations","volume":"63","author":"Burdziakowski","year":"2018","journal-title":"E3S Web Conf."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Burdziakowski, P. (2018, January 2\u20138). UAV in todays photogrammetry\u2014Application areas and challenges. Proceedings of the 18th International Multidisciplinary Scientific GeoConference (SGEM 2018), Albena, Bulgaria.","DOI":"10.5593\/sgem2018\/2.3\/S10.031"},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Casella, E., Drechsel, J., Winter, C., Benninghoff, M., and Rovere, A. (2020). Accuracy of sand beach topography surveying by drones and photogrammetry. Geo-Mar. Lett., 1\u201314.","DOI":"10.1007\/s00367-020-00638-8"},{"key":"ref_36","first-page":"649","article-title":"Determination of the territorial sea baseline\u2014Aspect of using unmanned hydrographic vessels","volume":"10","author":"Specht","year":"2016","journal-title":"TransNav Int. J. Mar. Navig. Saf. Sea Transp."},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Specht, M., Specht, C., Lasota, H., and Cywi\u0144ski, P. (2019). Assessment of the steering precision of a hydrographic Unmanned Surface Vessel (USV) along sounding profiles using a low-cost multi-Global Navigation Satellite System (GNSS) receiver supported autopilot. Sensors, 19.","DOI":"10.3390\/s19183939"},{"key":"ref_38","doi-asserted-by":"crossref","unstructured":"Stateczny, A., Kazimierski, W., Burdziakowski, P., Motyl, W., and Wisniewska, M. (2019). Shore construction detection by automotive radar for the needs of autonomous surface vehicle navigation. ISPRS Int. J. Geo-Inf., 8.","DOI":"10.3390\/ijgi8020080"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"04005","DOI":"10.1051\/e3sconf\/20183504005","article-title":"Modeling and analysis of integrated bathymetric and geodetic data for inventory surveys of mining water reservoirs","volume":"35","author":"Lipecki","year":"2018","journal-title":"E3S Web Conf."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"1516","DOI":"10.2112\/07-0861.1","article-title":"Monitoring sandy shores morphologies by DGPS\u2014A practical tool to generate digital elevation models","volume":"24","author":"Baptista","year":"2008","journal-title":"J. Coast. Res."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"925","DOI":"10.2112\/JCOASTRES-D-18-00166.1","article-title":"A new method for determining the territorial sea baseline using an unmanned, hydrographic surface vessel","volume":"35","author":"Specht","year":"2019","journal-title":"J. Coast. Res."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1088\/1755-1315\/95\/3\/032011","article-title":"Determination of the territorial sea baseline\u2014Measurement aspect","volume":"95","author":"Specht","year":"2017","journal-title":"IOP Conf. Ser. Earth Environ. Sci."},{"key":"ref_43","first-page":"187","article-title":"The sea bottom surface described by coons pieces","volume":"45","author":"Makar","year":"2016","journal-title":"Sci. J. Marit. Univ. Szczec."},{"key":"ref_44","unstructured":"Council of Ministers of the Republic of Poland (2012). Ordinance of the Council of Ministers of 15 October 2012 on the National Spatial Reference System, (In Polish)."},{"key":"ref_45","first-page":"69","article-title":"Methods to generate numerical models of terrain for spatial ENC presentation","volume":"18","author":"Sassais","year":"2011","journal-title":"Ann. Navig."},{"key":"ref_46","doi-asserted-by":"crossref","unstructured":"Specht, M., Specht, C., W\u0105\u017c, M., Naus, K., Grz\u0105dziel, A., and Iwen, D. (2019). Methodology for performing territorial sea baseline measurements in selected waterbodies of Poland. Applied Sciences, 9.","DOI":"10.3390\/app9153053"},{"key":"ref_47","unstructured":"Specht, C., Mindykowski, J., D\u0105browski, P., Ma\u015bnicki, R., Marchel, \u0141., and Specht, M. (2019, January 3\u20135). Metrological aspects of the tombolo effect investigation\u2014Polish case study. Proceedings of the 2019 IMEKO TC-19 International Workshop on Metrology for the Sea (IMEKO 2019), Genova, Italy."},{"key":"ref_48","doi-asserted-by":"crossref","unstructured":"Masnicki, R., Specht, C., Mindykowski, J., D\u0105browski, P., and Specht, M. (2020). Accuracy analysis of measuring X-Y-Z coordinates with regard to the investigation of the tombolo effect. Sensors, 20.","DOI":"10.3390\/s20041167"},{"key":"ref_49","unstructured":"Joint Committee for Guides in Metrology (2008). Evaluation of Measurement Data\u2014Guide to the Expression of Uncertainty in Measurement, JCGM. [1st ed.]."},{"key":"ref_50","doi-asserted-by":"crossref","unstructured":"Stateczny, A., Gro\u0144ska, D., and Motyl, W. (2018, January 21\u201323). Hydrodron\u2014New step for professional hydrography for restricted waters. Proceedings of the 2018 Baltic Geodetic Congress, Olsztyn, Poland.","DOI":"10.1109\/BGC-Geomatics.2018.00049"},{"key":"ref_51","doi-asserted-by":"crossref","unstructured":"Stateczny, A., W\u0142odarczyk-Sielicka, M., Gro\u0144ska, D., and Motyl, W. (2018, January 21\u201323). Multibeam echosounder and LiDAR in process of 360-degree numerical map production for restricted waters with HydroDron. Proceedings of the 2018 Baltic Geodetic Congress, Olsztyn, Poland.","DOI":"10.1109\/BGC-Geomatics.2018.00061"},{"key":"ref_52","doi-asserted-by":"crossref","unstructured":"Specht, M., Specht, C., W\u0105\u017c, M., D\u0105browski, P., Sk\u00f3ra, M., and Marchel, \u0141. (2019). Determining the variability of the territorial sea baseline on the example of waterbody adjacent to the municipal beach in Gdynia. Appl. Sci., 9.","DOI":"10.3390\/app9183867"}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/12\/4\/737\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T09:01:04Z","timestamp":1760173264000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/12\/4\/737"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,2,23]]},"references-count":52,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2020,2]]}},"alternative-id":["rs12040737"],"URL":"https:\/\/doi.org\/10.3390\/rs12040737","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,2,23]]}}}