Sediment Transport Mechanisms in a Lagoon with High River Discharge and Sediment Loading
| Autor: | Diana Vaičiūtė, Jovita Mėžinė, Petras Zemlys, Georg Umgiesser, Christian Ferrarin, Rasa Idzelytė |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:Hydraulic engineering
010504 meteorology & atmospheric sciences Geography Planning and Development Suspended organic matter SHYFEM 010501 environmental sciences Aquatic Science 01 natural sciences Biochemistry sediment transport Curonian Lagoon lcsh:Water supply for domestic and industrial purposes Settling lcsh:TC1-978 Sedimentary budget 0105 earth and related environmental sciences Water Science and Technology Hydrology lcsh:TD201-500 Discharge Sediment Storm Sediment concentration numerical modeling Environmental science Sediment transport |
| Zdroj: | Water, Vol 11, Iss 10, p 1970 (2019) Water (Basel) 11 (2019). doi:10.3390/w11101970 info:cnr-pdr/source/autori:Mezine J.; Ferrarin C.; Vaiciute D.; Idzelyte R.; Zemlys P.; Umgiesser G./titolo:Sediment transport mechanisms in a lagoon with high river discharge and sediment loading/doi:10.3390%2Fw11101970/rivista:Water (Basel)/anno:2019/pagina_da:/pagina_a:/intervallo_pagine:/volume:11 Water Volume 11 Issue 10 Water, Basel : MDPI, 2019, vol. 11, iss. 10, art. no. 1970, p. 1-24 |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w11101970 |
| Popis: | The aim of this study was to investigate the sediment dynamics in the largest lagoon in Europe (Curonian Lagoon, Lithuania) through the analysis of in situ data and the application of a sediment transport model. This approach allowed to identify the propagation pathway of the riverine suspended sediments, to map erosion-accumulation zones in the lagoon and calculate the sediment budget over a 13-year-long simulation. Sampled suspended sediment concentration data are important for understanding the characteristics of the riverine and lagoon sediments, and show that the suspended organic matter plays a crucial role on the sediment dynamics for this coastal system. The numerical experiments carried out to study sediment dynamics gave satisfactory results and the possibility to get a holistic view of the system. The applied sediment transport model with a new formula for settling velocity was used to estimate the patterns of the suspended sediments and the seasonal and spatial sediment distribution in the whole river&ndash lagoon&ndash sea system. The numerical model also allowed understanding the sensitivity of the system to strong wind events and the presence of ice. The results reveal that during extreme storm events, more than 11.4 × 106 kg of sediments are washed out of the system. Scenarios without ice cover indicate that the lagoon would have much higher suspended sediment concentrations in the winter season comparing with the present situation with ice. The results of an analysis of a long-term (13 years) simulation demonstrate that on average, 62% of the riverine sediments are trapped inside the lagoon, with a marked spatially varying distribution of accumulation zones. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|