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Drifters have the potential of facilitating the monitoring and modeling of river behavior at a fraction of traditional monitoring costs. They are floating objects equipped with sensors able to passively follow the movements of water. During their travel, they collect and transmit information about their movement and their surrounding environment. In this paper, we present and assess a low-cost (&lt;150 EUR) customizable drifter developed with off-the-shelf components. The open drifter is capable of handling the majority of use cases defined in the specialized literature and in addition it offers a general river flow characterization toolkit. One of the main goals of this work is to establish an open hardware and software basis to increase the use of drifters in river studies. Results show that the proposed drifter provides reliable surface velocity estimates when compared to a commercial flow meter, offering a lower cost per data point and in contrast to traditional point measurements it can be used to identify and classify large-scale surface flow patterns. The diverse sensor payload of the open drifter presented in this work makes it a new and unique tool for autonomous river characterization.<\/jats:p>","DOI":"10.3390\/s22249918","type":"journal-article","created":{"date-parts":[[2022,12,19]],"date-time":"2022-12-19T09:31:01Z","timestamp":1671442261000},"page":"9918","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["An Open Surface Drifter for River Flow Field Characterization"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2384-9085","authenticated-orcid":false,"given":"Juan Francisco","family":"Fuentes-P\u00e9rez","sequence":"first","affiliation":[{"name":"GEA-Ecohydraulics, Department of Agricultural and Forestry Engineering, University of Valladolid, Campus La Yutera, Avenida de Madrid 44, 34004 Palencia, Spain"},{"name":"Centro Tecnol\u00f3gico Agrario y Agroalimentario, Itagra.ct, Campus La Yutera, Avenida de Madrid 44, 34004 Palencia, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4566-9499","authenticated-orcid":false,"given":"Francisco Javier","family":"Sanz-Ronda","sequence":"additional","affiliation":[{"name":"GEA-Ecohydraulics, Department of Agricultural and Forestry Engineering, University of Valladolid, Campus La Yutera, Avenida de Madrid 44, 34004 Palencia, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0832-7334","authenticated-orcid":false,"given":"Jeffrey A.","family":"Tuhtan","sequence":"additional","affiliation":[{"name":"Department of Computer Systems, School of Information Technologies, Tallinn University of Technology, 12616 Tallinn, Estonia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,12,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Kummu, M., de Moel, H., Ward, P.J., and Varis, O. (2011). How close do we live to water? A global analysis of population distance to freshwater bodies. PLoS ONE, 6.","DOI":"10.1371\/journal.pone.0020578"},{"key":"ref_2","unstructured":"European Environment Agency (2016). Rivers and Lakes in European Cities Past and Future Challenges, Publications Office of the EU."},{"key":"ref_3","unstructured":"Fuentes-P\u00e9rez, J.F. (2017). Hydraulic Modeling of Fishways under Variable Hydrodynamic Scenarios, Universidad de Valladolid."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"121","DOI":"10.1007\/s00027-015-0428-1","article-title":"Diagnosing problems produced by flow regulation and other disturbances in Southern European Rivers: The Porma and Curue\u00f1o Rivers (Duero Basin, NW Spain)","volume":"78","year":"2016","journal-title":"Aquat. Sci."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"514","DOI":"10.1038\/415514a","article-title":"Increasing risk of great floods in a changing climate","volume":"415","author":"Milly","year":"2002","journal-title":"Nature"},{"key":"ref_6","first-page":"24","article-title":"Los Sistemas Autom\u00e1ticos de Informaci\u00f3n Hidrol\u00f3gica (SAIH): El sector del Agua y la transformaci\u00f3n digital en la Ingenier\u00eda Civil","volume":"3615","author":"Centero","year":"2019","journal-title":"Rev. Obras P\u00fablicas"},{"key":"ref_7","unstructured":"(2022, December 12). BfG Bundesanstalt f\u00fcr Gew\u00e4sserkunde. Available online: www.bafg.de."},{"key":"ref_8","unstructured":"(2022, December 12). Keskkonnaagentuur Estonian Weather Service. Available online: www.ilmateenistus.ee."},{"key":"ref_9","unstructured":"(2019). Anuario de Aforos 2015-16, Servicio de Publicaciones del CEDEX."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"227","DOI":"10.1016\/j.jhydrol.2005.12.003","article-title":"Error propagation for velocity and shear stress prediction using 2D models for environmental management","volume":"328","author":"Pasternack","year":"2006","journal-title":"J. Hydrol."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1315","DOI":"10.1002\/esp.1614","article-title":"Measuring river velocities using GPS river flow tracers (GRiFTers)","volume":"33","author":"Stockdale","year":"2008","journal-title":"Earth Surf. Process. Landforms J. Br. Geomorphol. Res. Gr."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Swick, W., and MacMahan, J. (2009, January 26\u201329). The use of position-tracking drifters in riverine environments. Proceedings of the OCEANS, Biloxi, MS, USA.","DOI":"10.23919\/OCEANS.2009.5422397"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Emery, L., Smith, R., McNeal, D., Hughes, B., Swick, L.W., and MacMahan, J. (2010, January 20\u201323). Autonomous collection of river parameters using drifting buoys. Proceedings of the OCEANS, Seattle, WA, USA.","DOI":"10.1109\/OCEANS.2010.5664521"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"618","DOI":"10.1002\/rob.21623","article-title":"Heterogeneous fleets of active and passive floating sensors for river studies","volume":"33","author":"Tinka","year":"2016","journal-title":"J. F. Robot."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"124","DOI":"10.1002\/rra.3238","article-title":"Kayak drifter surface velocity observation for 2D hydraulic model validation","volume":"34","author":"Barker","year":"2018","journal-title":"River Res. Appl."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"471","DOI":"10.1080\/00221686.2019.1623930","article-title":"A Lagrangian drifter for surveys of water surface roughness in streams","volume":"58","author":"Noss","year":"2020","journal-title":"J. Hydraul. Res."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"59","DOI":"10.1146\/annurev-marine-010816-060641","article-title":"Advances in the Application of Surface Drifters","volume":"9","author":"Lumpkin","year":"2016","journal-title":"Ann. Rev. Mar. Sci."},{"key":"ref_18","unstructured":"Intergovernmental Oceanographic Commission (1988). Guide to Drifting Data Buoys, Unesco."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1898","DOI":"10.1175\/JPO3028.1","article-title":"Aegean surface circulation from a satellite-tracked drifter array","volume":"37","author":"Olson","year":"2007","journal-title":"J. Phys. Oceanogr."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"231","DOI":"10.1175\/BAMS-D-15-00080.1","article-title":"A global ocean observing system for measuring sea level atmospheric pressure : Effects and impacts on numerical weather prediction","volume":"98","author":"Centurioni","year":"2017","journal-title":"Bull. Am. Meteorol. Soc."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"58","DOI":"10.3389\/fmars.2019.00058","article-title":"A state-of-the-art compact surface drifter reveals pathways of floating marine litter in the German Bight","volume":"6","author":"Badewien","year":"2019","journal-title":"Front. Mar. Sci."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"51","DOI":"10.1016\/j.marpolbul.2011.04.016","article-title":"Pathways of marine debris derived from trajectories of Lagrangian drifters","volume":"65","author":"Maximenko","year":"2012","journal-title":"Mar. Pollut. Bull."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"435","DOI":"10.5194\/gi-9-435-2020","article-title":"Easy to build low-power GPS drifters with local storage and acellular modem made from off-the-shelf components","volume":"9","author":"Hut","year":"2020","journal-title":"Geosci. Instrum. Methods Data Syst."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Emery, L., Smith, R., McNeal, D., and Hughes, B. (2009, January 26\u201329). Drifting buoy for autonomous measurement of river environment. Proceedings of the OCEANS, Biloxi, MS, USA.","DOI":"10.23919\/OCEANS.2009.5422416"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"579","DOI":"10.1175\/JTECH-D-14-00127.1","article-title":"High-resolution GNSS-tracked drifter for studying surface dispersion in shallow water","volume":"32","author":"Suara","year":"2015","journal-title":"J. Atmos. Ocean. Technol."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"2531","DOI":"10.1177\/0954406213475947","article-title":"Design of a network of robotic Lagrangian sensors for shallow water environments with case studies for multiple applications","volume":"227","author":"Oroza","year":"2013","journal-title":"Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Beard, J., Weekly, K., Oroza, C., Tinka, A., and Bayen, A.M. (2012, January 13\u201314). Mobile phone based drifting lagrangian flow sensors. Proceedings of the 2012 IEEE 3rd International Conference on Networked Embedded Systems for Every Application (NESEA), Liverpool, UK.","DOI":"10.1109\/NESEA.2012.6474008"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"901","DOI":"10.1007\/s12665-016-5702-6","article-title":"A study of surface mixing in a meandering channel using GPS floaters","volume":"75","author":"Han","year":"2016","journal-title":"Environ. Earth Sci."},{"key":"ref_29","unstructured":"(2020, March 25). Arduino Arduino Webpage. Available online: https:\/\/www.arduino.cc\/."},{"key":"ref_30","unstructured":"U-Blox (2015). Product Summary U-Blox M8 Concurrent GNSS Module\u2014UBX-15025193\u2014R03, U-blox. [3rd ed.]."},{"key":"ref_31","unstructured":"(2020, February 25). Adafruit Industries Adafruit BNO055 Absolute Orientation Sensor. Available online: https:\/\/learn.adafruit.com\/adafruit-bno055-absolute-orientation-sensor."},{"key":"ref_32","unstructured":"(2020, February 25). Adafruit Industries Adafruit DS3231 Precision RTC Breakout. Available online: https:\/\/learn.adafruit.com\/adafruit-ds3231-precision-rtc-breakout."},{"key":"ref_33","unstructured":"(2020, February 25). Pololu Mini Pushbutton Power Switch. Available online: https:\/\/www.pololu.com\/product\/2808."},{"key":"ref_34","unstructured":"(2022, December 12). SparkFun MicroSD Breakout. Available online: https:\/\/learn.sparkfun.com\/tutorials\/microsd-breakout-with-level-shifter-hookup-guide?_ga=2.185169578.2073379610.1670854842-447162298.1670854842."},{"key":"ref_35","unstructured":"(2022, December 12). Last Minute Engineers SIM800L GSM Module. Available online: https:\/\/lastminuteengineers.com\/sim800l-gsm-module-arduino-tutorial\/."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"1009","DOI":"10.5194\/tc-14-1009-2020","article-title":"Pressure and inertia sensing drifters for glacial hydrology flow path measurements","volume":"14","author":"Alexander","year":"2020","journal-title":"Cryosphere"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"149","DOI":"10.1080\/00221688909499249","article-title":"Three-dimensional turbulent structure in straight open channel flows","volume":"27","author":"Tominaga","year":"1989","journal-title":"J. Hydraul. Res."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"101388","DOI":"10.1016\/j.ecoinf.2021.101388","article-title":"Artificial lateral line for aquatic habitat modelling: An example for Lefua echigonia","volume":"65","author":"Fukuda","year":"2021","journal-title":"Ecol. Inform."},{"key":"ref_39","unstructured":"(2022, December 12). BlueRobotics Ping Sonar from BlueRobotics. Available online: https:\/\/bluerobotics.com\/store\/sensors-sonars-cameras\/sonar\/ping-sonar-r2-rp\/."},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Alexander, A., Tuhtan, J.A., Kruusmaa, M., Schuler, T.V., and K\u00e4\u00e4b, A. (2021). Water acceleration in a supraglacial channel predicts locations of step-pool sequence formation. EarthArXiv.","DOI":"10.31223\/X59P50"},{"key":"ref_41","doi-asserted-by":"crossref","unstructured":"Sanz-Ronda, F.J., Bravo-C\u00f3rdoba, F.J., Garc\u00eda-Vega, A., Valbuena-Castro, J., Mart\u00ednez-de-Azagra, A., and Fuentes-P\u00e9rez, J.F. (2021). Fish Upstream Passage through Gauging Stations: Experiences with Iberian Barbel in Flat-V Weirs. Fishes, 6.","DOI":"10.20944\/preprints202111.0400.v1"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"105946","DOI":"10.1016\/j.ecoleng.2020.105946","article-title":"Coarse fishway assessment to prioritize retrofitting efforts: A case study in the Duero River basin","volume":"155","year":"2020","journal-title":"Ecol. Eng."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/24\/9918\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:42:36Z","timestamp":1760146956000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/24\/9918"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,12,16]]},"references-count":42,"journal-issue":{"issue":"24","published-online":{"date-parts":[[2022,12]]}},"alternative-id":["s22249918"],"URL":"https:\/\/doi.org\/10.3390\/s22249918","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,12,16]]}}}