Puerto Caldera maintenance dredging
Jan de NulNov 2025 – Jan 2026Puerto Caldera, Costa RicaContextRestoring design depth at Costa Rica's main Pacific port, with independent control of the access channel and the disposal area.
ScopeVerification of the 4-monument geodetic network and a continuous base station. 44 ha multibeam pre- and post-dredge surveys, the 100 ha disposal area at both stages and 51 days of daily multibeam and dual-frequency singlebeam monitoring.
DeliverablesSeabed surfaces before and after dredging, theoretical design surfaces, volume computation and daily progress charts.
OutcomeDredging operations steered on daily data, and the executed volume closed out against an independent measurement.
APM Terminals maintenance dredging
Dutch Dredging (De Boer) · APM TerminalsAug 2023 – Oct 2023Port of Moín, LimónContextMaintenance dredging at the APM Terminals container terminal in Moín.
ScopeInstallation of a 6-monument geodetic network, pre-dredge surveys of the access channel (175 ha) and disposal area (38 ha), and daily progress surveys.
DeliverablesTwo theoretical design surfaces with maximum and minimum slopes, volume computation and charts in CRTM05 referred to mean low water springs.
OutcomeControl of the dredging scope against the design.
RECOPE berths, turning basin and access channel dredging
DEME GroupMar 2025 – Apr 2025Port of Moín, LimónContextDredging of berths 5-0 and 5-1, the access channel and the turning basin at RECOPE's facility in the Port of Moín.
ScopeVerification of the 4-monument geodetic network, a 152 ha preliminary multibeam survey and a 311 ha pre-dredge survey of berths, turning basin, access channel and disposal area.
DeliverablesSeabed surfaces and charts of the areas to be dredged. Total area: 463 ha.
OutcomeDefinition of the initial seabed condition as the basis for dredging.
Bathymetric, geophysical and benthic characterisation
INCOPOct 2023 – Dec 2023Puerto Caldera, Costa RicaContextStudy awarded by INCOP through a public tender: characterisation of the priority areas for the future modernisation of Puerto Caldera.
Scope29 ha of multibeam bathymetry, side scan sonar over 16.9 ha, a geophysical survey over 16.9 ha with 6 m penetration and sedimentological studies with laboratory analysis. Total area: 63 ha.
DeliverablesBathymetric, geophysical and benthic characterisation of the priority areas.
OutcomeTechnical baseline for the port's modernisation process.
Continuous land–sea integrated survey
Marina FlamingoApr 2025Guanacaste, Costa RicaContextIntegrated survey of Marina Flamingo, Guanacaste, from dry land to the bottom of the basin.
Scope90 ha of multibeam bathymetry, 11 ha of UAV LiDAR, 22 ha of aerial photogrammetry and side scan sonar over the breakwater.
DeliverablesContinuous land–sea model, orthomosaic, LiDAR point cloud, bathymetric surface and sonar mosaic in a single reference frame. Integrated area: 123 ha.
OutcomeA single baseline dataset for the marina's operation and planning.
Bathymetry of the berthing area and access channel
Marina LorosDec 2025 – Jan 2026Golfito, Costa RicaContextDevelopment of Marina Loros on the Golfo Dulce: updating the existing bathymetry for the design of berths and nautical access, and for the project's environmental file.
ScopeA three-point control network (monument ML-1 and two backup points) tied to MOPT control points in CRTM05 and to mean low water springs. Singlebeam GNSS RTK bathymetry over 118 ha of berthing area and access channel, with lines every 10 m at the berths and every 20 m in the channel.
DeliverablesTechnical report and charts with 1 m bathymetric contours and an elevation grid at 1:1,000, 1:2,500 and 1:5,000, from 22,595 cleaned soundings.
OutcomeUpdated depths, between −3 and −10 m, as the basis for the marina's master plan.
Access channel maintenance dredging
Dutch Dredging (De Boer)Jan 2024 – Oct 2024Suriname River, SurinameContextMaintenance dredging of a 68 km river access channel, 70 to 90 m wide, on the Suriname River.
ScopeDual-frequency singlebeam bathymetry for daily dredging control over the full channel length, with processing and volume computation, for ten months.
DeliverablesSeabed surface updated daily, dredged volumes and control charts.
OutcomeMaintenance dredging operated on daily data throughout the contract.
Bathymetry for submarine pipeline design
UNOPS – AyASep 2018 – Jun 2019Puerto Viejo, LimónContextDesign of a submarine pipeline at Puerto Viejo, Limón.
ScopeA 6-monument GNSS geodetic network in CRTM05 and multibeam bathymetry: 700 ha general, 691 ha complementary and 20 ha detail. Total area: 1,411 ha.
DeliverablesContours and charts in both WGS84 and CRTM05.
OutcomeSurvey basis for the submarine pipeline design.
