the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Alongshore sediment transport analysis for a semi-enclosed basin: a case study of the Gulf of Riga, the Baltic Sea
Abstract. The properties of wave-driven sediment transport and the dimensions of single sedimentary compartments are often radically different in different parts of semi-enclosed water bodies with an anisotropic wind climate. The western, southern and eastern shores of the Gulf of Riga are a remote part of the more than 700 km long interconnected sedimentary coastal system of the eastern Baltic Sea from Samland in Kaliningrad District, Russia, to Pärnu Bay, Estonia. Even though shores of the gulf are generally straight or gently curved, the presence of small headlands and variations in the orientation of the coastline give rise to numerous fully or partially separated sedimentary compartments. We decompose sedimentary shores of this gulf into single compartments and cells based on the analysis of wave-driven potential sediment transport using high-resolution wave time series and the Coastal Engineering Research Centre (CERC) approach. The western shores of the Gulf of Riga form a large interconnected sedimentary system with intense sediment transport that is largely fed by sand transported from the Baltic proper. The southern shores have much less intense sediment transport and mostly accumulation areas. The south-eastern sector of the gulf is an end station of counter-clockwise sand transport. The eastern shore consists of several almost isolated sedimentary cells and contains a longer segment where clockwise transport predominates. The transport rates along different shore segments show extensive interannual variations but no explicit trends in the period 1990–2022.
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RC1: 'Comment on egusphere-2024-2640', Anonymous Referee #1, 19 Nov 2024
Dear Author,
Thank you for the interesting article. This study provides valuable insights into sediment transport in semi-enclosed water bodies with limited fetch and depths.
Although I have only minor comments, I hope they will help make the article easier to read and understand:
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Introduction
- The terms divergence area (line 34) and sediment flux divergence area (line 48) are not well-defined. For readers unfamiliar with this approach, these terms might be confusing and should be explained more clearly. What do you mean by using these terms? Even if they are explained in detail later, a brief clarification in this section would be helpful.
- Line 74: It is unclear what the main aim and objectives of the article are. What is the primary purpose of this research? While this is mentioned in Section 4, it should also be highlighted in the Introduction section.
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Methods and Data
- Figure 3: Including information about when the picture was taken (spring, autumn, or summer) would be valuable for evaluating the scale of erosion.
- Section 2.2 - The SWAN model data for the nearshore of the study area: The explanation of why wave data from the SWAN model is needed begins on line 160. This should be moved to the beginning of the section for better clarity.
- Line 198: The number of grids and their location are shown in Figure 4, not Figure 1.
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Alongshore Sediment Transport Patterns
- This section might be better renamed Materials and Discussion since, along with presenting the sediment transport pattern analysis, it also includes comparisons with previous works. Also part of the section 4 should be moved here, like fig. 13 and it's description.
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Discussion and Conclusion
- This section should be reshaped into a Conclusion section, as much of the discussion already appears in the previous section.
- Figure 13 presents one of the main results of this article and should be introduced earlier in the text.
Citation: https://doi.org/10.5194/egusphere-2024-2640-RC1 -
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RC2: 'Comment on egusphere-2024-2640', Anonymous Referee #2, 29 Nov 2024
The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2024/egusphere-2024-2640/egusphere-2024-2640-RC2-supplement.pdf
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