Predict the spatial down-coast pattern of littoral drift on a 50 km reach of coast, assuming that the littoral cell is in steady state. Assume that the backwearing rate of the bounding 10-m tall seacliffs is 20 cm/year, and that they are composed of materials that are 20% sand, 80% silt and clay. The coastline is punctuated by two rivers, at 10 and 35 km down coast from the top of the cell, which deliver sediment that is 80% sand, at rates of 1.2x10⁵ m³/yr, and 1.8x10⁵ m³/yr respectively. Assume that no sand is lost to the shelf.