Evolution modules
The LITPACK package includes three modules for modelling the evolution of a coastline or a seabed: LITLINE , LITTREN and LITPROF.
Coastline evolution analyses are performed with the LITLINE module. Based upon the results from LITDRIFT, LITLINE simulate the coastal response to gradients in the longshore sediment transport capacity resulting from natural features and a wide variety of coastal structures. LITLINE calculates the coastline evolution by solving a continuity equation for the sediment in the littoral zone. The influence of structures, sources and sinks are included. The structure types in LITLINE include:
- groynes
- jetties
- revetments
- offshore breakwaters
LITTREN finds application in areas, where the suspended load is not in equilibrium with the local hydrodynamics for example channel backfilling and intake intrusion problems. Based on the standard STP formulation, TREN links a one-dimensional wave/current model to the vertical sediment diffusion equation. Bed load transport and the near bed concentration include gravity effects which are found to be important. When the channel direction is similar to the persistent current direction, gravity effects are the dominating back-filling mechanism.
Storm profile response and the response of beach nourishment to storm conditions can be investigated with the profile evolution model, LITPROF. STP provides the deterministic basis for quantifying the cross-shore transport distribution. LITPROF includes the effects of changing morphology on the wave climate and transport regime allowing for a profile development for time-varying incident wave fields. The effects and features include:
- time series of wave heights and water levels
- shoaling and refraction of waves breaking
- transport including the effects of undertow, Lagrangian drift, streaming and bed slope
- possibility of nonerodible bed, submerged breakwater and revetment