The number of FEs gradually increases to accommodate newly deposited sediments and each FE changes its shape, that is, becomes compressed, following sediment compaction. A Lagrangian approach underlies the model by means of an adaptive mesh. The model input consists of sedimentation varying in time, space and sediment type. The model couples a groundwater flow and a compaction module that interact in a time‐evolving domain following landform aggradation. We present a novel finite element (FE) simulator that quantifies the impact of natural compaction on landform evolution in a three‐dimensional setting. However, this process is generally oversimplified in morphological simulators. Consequently, they often experience significant compaction due to their own weight, that is, autocompaction, which creates an important feedback within the geomorphological evolution of the landform. The body of these landforms consists of unconsolidated sediments with high porosity and compressibility. These dynamic environments host vulnerable ecosystems with an essential role for biodiversity conservation, coastal protection and human activities. Natural environments such as coastal wetlands, lowland river floodplains, and deltas are formed by sediment, transported by watercourses and the sea, and deposited over century to millennium timescales.
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