Riverine Processes and Channel Evolution

Chemical weathering is not a primary agent of riverine erosion, as it is a slow process that occurs over long time scales. Hydraulic action, abrasion, and attrition are the primary agents of riverine erosion, as they involve the physical breakdown of sediment by the force of flowing water and sediment particles.

Sediment transport is the process by which sediment is moved downstream in a river. Erosion is the process by which sediment is detached from the riverbed or banks, deposition is the process by which sediment is deposited on the riverbed or banks, and channel migration is the process by which the river channel moves laterally over time.

Vegetation is not a major control on sediment transport in a river, as it is a relatively minor factor compared to water discharge, sediment supply, and channel slope. Vegetation can influence sediment transport to some extent, but it is not a primary control.

Alluvial refers to sediment deposited by a river. Glacial deposits are referred to as till, wind-blown deposits are referred to as loess, and marine deposits are referred to as marine sediments.

Dendritic is a type of drainage pattern, not a type of river channel pattern. Straight, meandering, and braided are all types of river channel patterns.

Channel migration is the process by which a river channel migrates laterally over time. Avulsion is the process by which a river abandons its current channel and creates a new one, meandering is a type of river channel pattern characterized by sinuous bends, and braiding is a type of river channel pattern characterized by multiple channels separated by sediment bars.

Sand dune is not a type of riverine landform, as it is a landform associated with wind-blown sediment. Floodplains, meanders, and oxbow lakes are all types of riverine landforms.

Avulsion is the process by which a river abandons its current channel and creates a new one. Channel migration is the process by which a river channel migrates laterally over time, meandering is a type of river channel pattern characterized by sinuous bends, and braiding is a type of river channel pattern characterized by multiple channels separated by sediment bars.

Climate is not a direct factor that influences river channel evolution, as it primarily affects the hydrology and sediment supply of a river. Water discharge, sediment supply, and channel slope are all direct factors that influence river channel evolution.

Thalweg refers to the deepest part of a river channel.

Sand dune is not a type of sediment deposit found in a river channel, as it is a landform associated with wind-blown sediment. Point bar, riffle, and pool are all types of sediment deposits found in a river channel.

Deposition is the process by which sediment is deposited on the riverbed or banks. Erosion is the process by which sediment is detached from the riverbed or banks, sediment transport is the process by which sediment is moved downstream in a river, and channel migration is the process by which the river channel moves laterally over time.

Desert is not a type of riverine ecosystem, as it is a terrestrial ecosystem characterized by a lack of water. Riparian forest, wetland, and grassland are all types of riverine ecosystems.

Braided river refers to a river with multiple channels separated by sediment bars.

Sand dune is not a type of riverine landform created by erosion, as it is a landform associated with wind-blown sediment. Canyon, gorge, and valley are all types of riverine landforms created by erosion.