GEOG 101 Lecture Notes - Lecture 13: Hydrosphere, Lake Ontario, Lake Baikal
Document Summary
Consequent-streams that develop as a result of the original tilt of the land surface. In folded or tilted strata the tilt occurs before the stream develops. Antecedent streams-streams existed before uplift or tilting. These streams channels are sometimes referred to as being superimposed on the landscape. Base level-the lower limit that a stream can erode downward to. Local base level can be a resistant rock layer, lake or reservoir. Graded stream-a stream in which the gradient and stream profile has adjusted to its base level, flow regime and the volume of sediment it transports. Sea level changes cause streams to adjust by either downcutting or aggrading. Adjust to new base level and new floodplain forms. Each terrace is an old floodplain surface and represents a different base level condition. Entrenched meanders-meanders are at bottom of valley. Youthful-v-shaped, no flooding, eroding down, relatively straight. Mature-has a flood plain, eroding laterally, meandering. Old age-massive floodplain, eroding laterally, oxbow lakes and meander scars.
