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| Title | Connectivity Phases Reorganize Radionuclide Source Activation and Reshape Concentration–Discharge Patterns | |
|---|---|---|
| Author 1 | Yasunori Igarashi | |
| Author 2 | Yuichi Onda | |
| Author 3 | Valentyn Protsak | |
| Author 4 | Gennady Laptev | |
| Authors 5- | Alexei Konoplev, Serhii Kirieiev, Dmitry Samoilov, Dmytrii Holiaka | |
| Subject | Lakes & Rivers | |
| Subject_sub1 | ||
| Subject_sub2 | ||
| Abstract | River networks regulate downstream discharge and solute contributions from spatially distinct source areas within a catchment. Yet concentration–discharge (C–Q) relationship assume continuous source accessibility, limiting prediction when networks expand, contract and rewet. In radioactively contaminated catchments, dissolved 137Cs and 90Sr still show episodic exceedances decades after deposition, testing this limitation. Here we show that phase-dependent river network connectivity reorganise which contaminated source areas are hydrologically accessible, producing distinct C–Q patterns even at comparable discharge. Using field observations from the Chernobyl catchment and network-scale flux comparisons, we distinguish three connectivity phases: fully connected, partially disconnected, and rewetting, and quantified phase-specific changes in tributary contributions. During rewetting, channel continuity returns before radionuclide fluxes recover uniformly, consistent with catchment memory delaying access to near-surface contaminant stores. Treating source accessibility as a state set by connectivity and memory enables phase-aware forecasting and monitoring of exceedance risk under increasingly variable hydroclimatic conditions. This dataset contains the event-based measurements of dissolved radionuclide concentrations used in this study. | |
| Temporal coverage | 2018-2019 | |
| Spatial coverage | 51.3822 N ~ 51.421 N, 29.7791 E ~ 30.0057 E | |
| File format | Delimited | |
| Language | English | |
| Discovery metadata record | ||
| Publisher | Center for Research in Radiation, Isotopes, and Earth System Sciences, University of Tsukuba | |
| Publication year | 2026 | |
| Publication date | 3rd of March | |
| Digital Object Identifier (DOI) | 10.34355/CRiES.U.Tsukuba.00344 Data Download (9KB) | |
| Short DOI | ||
| Citation text | Igarashi, Y., Onda, Y., Protsak, V., Laptev, G., Konoplev, A., Kirieiev, S., Samoilov, D., & Holiaka, D. (2026). Connectivity phases reorganize radionuclide source activation and reshape concentration–discharge patterns [Data set]. Center for Research in Radiation, Isotopes, and Earth System Sciences, University of Tsukuba. https://doi.org/10.34355/CRiES.U.Tsukuba.00344 | |
| Serial at center | 00344 | |
| Serial at each Univ./Institute | TSUK00067 | |
| Key word 1 | Chornobyl | |
| Key word 2 | 90Sr | |
| Key word 3 | 137Cs | |
| Key word 4 | river | |
| Key word 5 | water | |
| Remarks | ||