Building seawalls can have various indirect consequences. One indirect consequence is that it can lead to the destruction of the shoreline habitat through the loss of sand. Seawalls can disrupt the natural flow of sand along the shore, which is essential for maintaining the balance of the ecosystem. Without this natural supply of sand, habitats for various organisms can be negatively impacted, affecting the overall biodiversity of the area.
Additionally, seawalls can also alter wave patterns and sediment transport along the coast, which may have further ecological implications. The construction of seawalls can change the way waves interact with the shoreline, potentially causing erosion in adjacent areas where the waves are redirected.
Therefore, one indirect consequence of building seawalls is the destruction of shoreline habitat through the loss of sand and the disruption of natural coastal processes.
