Nayak, Soumya Kanta; Ehlert von Ahn, Cátia Milene; Gupta, Naveen; Ramasamy, Murugan; Nozik, Alexandra; Nandimandalam, Janardhana Raju; Moosdorf, Nils (2026): High-resolution porewater salinity measurements across contrasting subterranean estuaries [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.995958
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Published: 2026-07-14 • DOI registered: 2026-07-14
Abstract:
This dataset provides high-resolution porewater salinity measurements used to investigate spatial variability within subterranean estuaries (STEs) across contrasting coastal settings. Field surveys were conducted at Marine Drive beach and Siali beach along the Odisha coast, India, and at Spiekeroog Beach, Germany. Sampling campaigns were performed during the post-monsoon season (October 2024) at Marine Drive and Siali beaches, during the pre-monsoon season (March 2026) at Marine Drive beach, and in June 2025 at Spiekeroog beach. Porewater was collected from the intertidal zone at 0.5 m sediment depth using a push-point sampler following meter-scale grid-based surveys to characterize lateral variations in fresh-saline mixing. Sampling locations were mapped using QField for QGIS connected via Bluetooth to a Trimble DA2 GNSS receiver with an active Catalyst subscription, enabling high-precision positioning and simultaneous recording of spatial coordinates with field measurements. Porewater salinity, electrical conductivity, and temperature were measured in situ using a WTW multiparameter probe (Xylem Analytics Germany). The measurements capture localized freshening zones and heterogeneous mixing patterns within STEs, highlighting the spatial complexity of fresh-saline mixing. This dataset supports the evaluation of lateral variability in SGD pathways and contributes to improved understanding of the spatial heterogeneity of STEs at the beach scale.
Keyword(s):
Project(s):
Funding:
Alexander von Humboldt Foundation, grant/award no. 1051559-IND-IP: INPA - AvH Insitute Partnership JNU-ZMT
Federal Ministry of Research, Technology and Space (BMFTR), grant/award no. 03F0965H: DAM CDRmare - RETAKE-2, ZMT
Coverage:
Median Latitude: 22.945213 * Median Longitude: 79.203660 * South-bound Latitude: 19.857783 * West-bound Longitude: 7.709483 * North-bound Latitude: 53.782292 * East-bound Longitude: 86.467634
Date/Time Start: 2024-10-07T00:00:00 * Date/Time End: 2026-03-23T18:22:59
Minimum DEPTH, sediment/rock: 0.5 m * Maximum DEPTH, sediment/rock: 0.5 m
Event(s):
MD_1_India (Marine Drive beach) * Latitude: 19.858384 * Longitude: 86.085957 * Date/Time: 2024-10-07T00:00:00 * Location: Marine Drive beach, Odisha, India * Method/Device: PushPoint Sampler * Comment: Post Monsoon
Comment:
Elevation corrected with the Quasigeoid GCG2016/2023 from Bundesamt für Katrographie und Geodäsie (CC-BY 4.0)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Nayak, Soumya Kanta | |||
| 2 | DEPTH, sediment/rock | Depth sed | m | Nayak, Soumya Kanta | PushPoint Sampler | Geocode |
| 3 | Salinity | Sal | Nayak, Soumya Kanta | Multiparameter probe, WTW, Xylem Analytics Germany (WTW) | PSU | |
| 4 | Conductivity | Cond | µS/cm | Nayak, Soumya Kanta | Multiparameter probe, WTW, Xylem Analytics Germany (WTW) | |
| 5 | Temperature, water | Temp | °C | Nayak, Soumya Kanta | Multiparameter probe, WTW, Xylem Analytics Germany (WTW) | |
| 6 | Comment | Comment | Nayak, Soumya Kanta |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1078 data points