Channel flood plain linkages on the Kam Tin River, Hong Kong

Abstract

A simple graphical comparison of superimposed courses of the Kam Tin (North) River for the period 1959/60 to 1983/85 reveals lateral migration of a number of meander bends. Field measurements also confirm erosion of the river bank. Observations on the properties of suspended matter transported by the Kam Tin River suggest that channel bank materials are not an important source under stable runoff conditions. However, during stormflow channel bank materials may provide sediment to the river. Engineering works associated with river training to alleviate flooding and improve drainage have resulted in a dramatic change to river plan form and decoupled the river from the flood plain. Main drainage channel construction also has an environmental impact that is briefly outlined.