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They are based on a third-order extension of the technique introduced in Casulli &amp; Cheng [15]. The stability conditions for these schemes depend on the velocity and not on the celerity, allowing us to reduce computational efforts, especially in subcritical flow simulations, which is the regime we are mainly interested in. The main novelty consists in the third-order approximation of the pressure gradient term in the momentum equation through appropriate polynomial reconstructions. Concretely, CWENO conservative reconstruction is considered for the water thickness\n                    <jats:italic>h<\/jats:italic>\n                    and a centered fourth-degree polynomial is adopted interpolating the cell averages of the free surface\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$\\eta $$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mi>\u03b7<\/mml:mi>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    . For time discretization, a third-order IMEX scheme is applied. In addition, a novel time-dependent semi-analytical solution for Saint-Venant-Exner system is introduced and compared with the numerical ones. Several tests are performed, including accuracy tests showing third-order accuracy, well-balance tests, and simulations of slow bedload processes for large time.\n                  <\/jats:p>","DOI":"10.1007\/s10915-025-03093-8","type":"journal-article","created":{"date-parts":[[2025,10,23]],"date-time":"2025-10-23T14:11:42Z","timestamp":1761228702000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["A Third-Order Finite Volume Semi-Implicit Method for the Shallow Water-Exner Model"],"prefix":"10.1007","volume":"105","author":[{"given":"Enrique D.","family":"Fernandez-Nieto","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jose","family":"Garres-Diaz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7180-3351","authenticated-orcid":false,"given":"Emanuele","family":"Macca","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giovanni","family":"Russo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,10,23]]},"reference":[{"key":"3093_CR1","doi-asserted-by":"crossref","unstructured":"Armanini, A.: Principles of River Hydraulics. 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