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LITPACK is a computer program that simulates sediment transport for a large number of wave/current scenarios and for the combination of these simulations into predictions of the net littoral drift, developments of coastal profiles, and long-term coastline evolution. LITPACK was developed by DHI Water.Environment.Health.

The two main modules in LITPACK are the LITSTP and LITDRIFT modules which calculate the sediment transport budgets.

LITSTP calculates the non-cohesive sediment transport in combined waves and currents. The STP module is integrated in the other LITPACK modules and forms the basis for all sediment transport calculations in LITPACK. STP solves the vertical sediment diffusion equation on an intrawave period grid to provide a detailed description of the non-cohesive sediment transport for breaking / nonbreaking waves and current. STP accounts for:

waves and currents at arbitrary angles breaking / non-breaking waves plane / ripple-covered bed uniform / graded bed material effect of bed slope effect of streaming

The LITDRIFT module combines STP with a coastal hydrodynamic module to give a deterministic description of the littoral drift. The DRIFT module simulates the cross-shore distribution of wave height, setup and longshore current for an arbitrary coastal profile providing a detailed deterministic description of the cross-shore distribution of the longshore sediment transport for both regular and irregular sea states. DRIFT solves the longshore and cross-shore momentum balance equation to give the cross-shore distribution of longshore current and setup. Wave decay due to breaking is modelled also. DRIFT accounts for:

regular / irregular waves water levels tidal currents wind shear stresses nonuniform bottom friction wave refraction and shoaling breaking nonuniform sediment distribution (


LITPACK can be used for impact assessment of coastal works, optimisation of beach redevelopment schemes, design and evaluation of coastal protection, estimation of channel backfilling, execution of morphological baseline studies.

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