![]() Dynamic allocation of accommodation space and the following adaptive sediments filling were the two main driving factors of the autogenic evolution of deltas. The experimental delta consisted of six autogenic depositional successions. The three sedimentary layers formed in the three stages constituted an autogenic succession. In the late aggradational–progradational stage, the feeder channel branched into several radial distributary channels, overlapped distributary channels were formed on the delta plain, and terminal lobe complexes were formed at the end of distributary channels. These distributary splay complexes were retrogradationally overlapped due to the continuous migration of the bifurcation point of the feeder channel. In the middle retrogradational stage, the feeder channel was blocked by the mouth bar(s) which grew out of water at the end of the initial stage, and a set of large-scale distributary splay complexes were formed on the delta plain. In the initial progradational stage, one feeder channel incised into the delta plain, mouth bar(s) was formed in front of the channel mouth, and small-scale crevasse splays were formed on the delta plain. The evolution of river-dominated delta controlled only by autogenic process is obviously periodic, and each autogenic cycle can be divided into an initial progradational stage, a middle retrogratational stage, and a late aggradational–progradational stage. ![]() Through the flume tank experiment under constant boundary conditions, the depositional process, evolution principles, and the sedimentary architecture of a river-dominated delta was presented, and a corresponding sedimentary architecture model was constructed. However, autogenic processes are often affected by changing allogenic factors and are difficult to be identified and analyzed from modern and ancient records. Impression of Deltares' current Delta flume at Markenesse.Autogenic processes are widely found in various sedimentary systems and they play an important role in the depositional evolution and corresponding sedimentary architecture. ![]() This news item is based on the press released published on the website of Deltares The new Delta Flume will be located next to the other experimental facilities of Deltares, including the Atlantic basin (650 m2) and the Delta basin (250 m2) for investigations related to flow forces, discharge coefficients, specific design details, bed protection and morphological impact of hydraulic structures. MTS will install its most powerful wave generator ever build, enabling Deltares to experiment with both regular and irregular waves. This allows the significant wave heights to be bigger, up to 2.2 m. Worldwide it will not be the longest one (Forschungszentrum Küste, Hannover, Germany has a flume of 309 m), but it will be world’s deepest. The flume of the new facility will be 300 m long, 9,5 m deep and 5 m wide. MTS System Corp (USA) is responsible for the construction of the wave generator. The new Delta Flume will be completed in November 2013 and replaces the existing flume at the other test location of Deltares in Markenesse.īallast Nedam Infra is building the Delta Flume. The new facility is unique as far as size and test features are concerned. On 12 September, the research institute Deltares started building the new wave test facility Delta flume at their premises in Delft.
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