PPT-Review: overland water erosion

PROCESSES Generate runoff Saturation excess Infiltration excess INFLUENCES Hydraulic soil properties Conductivity Compactionuse history Ground cover interception Antecedent conditions Existing moisture. * Earth’s main agent of natural erosion. What is erosion?. Erosion is. -. Agents of Erosion. Agents of erosion include. . --. Running water . is the. . big. . Kahuna. . of. . all. . erosional. Rain . Splash. Sheet. Rill. Gully . Heavy . rains in northwest Iowa washed away soil, leaving this scarred tableau. This type of erosion, termed sheet-and-rill erosion, occurs when there is insufficient vegetation to hold soil in place. As rain falls, it forms sheets of surface water that transport soil away. As more water accumulates, it forms runoff channels called rills, which further displace soil.. https://youtu.be/3TgQ06Z3q0I. Runoff. Saturation-excess runoff when water table meets the ground surface. Infiltration-excess runoff when precipitation rate exceeds infiltration rate. Horton’s conceptual hillslope model. streamflow. from . hillslopes. Baseflow. . streamflow. maintained by. groundwater contributions. Stormflow. Augmented by direct precipitation on saturated area. Overland flow. R. eturn flow. Shallow subsurface . Chapter 4.1. Pages 118-127. Key Questions. How does moving water cause erosion?. What land features are formed by water erosion and deposition?. Moving water is the major agent of the erosion that has shaped Earth’s land surface.. Water Erosion. How Does Moving Water Cause Erosion?. Erosion by water begins with a splash of rain.. Some rainfall sinks into the ground.. Some evaporates or is taken up by plants.. The rest of the water runs off over the land surface.. Chapter 4.1. Pages 118-127. Key Questions. How does moving water cause erosion?. What land features are formed by water erosion and deposition?. The GREAT . BLUE. HOLE . p. 118. Where is it located?. When common rock forming minerals are weathered the typical reaction results in some loss of . cations. and the production of clays. Because silicate mineral weathering consumes CO. 2. , weathering can influence global climate. Runoff meander . Rill. oxbow lake turbulence. Gully alluvial fan ice age. Stream delta . River. groundwater. . Tributary. sand dune. Drainage basin . Divide. . abrasion. . Flood . another.. 2 . kinds:. 1) . Rill erosion. is the erosion by running water in small channels. , on the side of a slope.. 2) . Gully erosion. is when a rill channel evolves to become deep and wide.. Runoff meander Rill oxbow lake turbulence. Gully alluvial fan ice age. Stream delta River. groundwater Tributary sand dune. Drainage basin Divide abrasion Flood plain beach. deflation. Runoff meander . Rill. oxbow lake turbulence. Gully alluvial fan ice age. Stream delta . River. groundwater. . Tributary. sand dune. Drainage basin . Divide. . abrasion. . Flood . What is Erosion?. Erosion is defined as removal of rocks and soil by wind, water, ice and gravity.. Wind, water, ice and gravity are also known as the agents of erosion.. Weathering vs. Erosion . Weathering involves two processes . The creation of sedimentary rocks. Weathering and Mass Movement. Objectives:. 1. Describe the processes by which erosion wears down and carries away rock. 2. Distinguish between chemical and mechanical weathering.