PPT-Sediment Deposition and River Structures

FREEING THE ELWHA Deposition of Large Materials Once rivers reach lower gradients their erosional power decreases and their ability to carry sediment downstream also decreases With low flows . FORMATION OF RIVER DELTAS. A delta is a large deposit of alluvial sediment forming a low-lying plain found at the mouth of a river.. River deltas form when a river carrying sediment . reaches:. (. 1) a body of standing water, such as a lake, . Objectives. Learn basic concepts of sediment transport and fluvial geomorphology. Understand sediment budgets (sources, sinks, pathways for sediment). Discuss infrastructure and ecosystem response. 1. 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.. Conowingo. Relicensing; LSRWA; MD County Resistance; Solutions; . CAC Involvement. Thursday November 29. 2012. Exelon and . Conowingo. Relicensing. Exelon Application states, “The cumulative impact of the Project to the system is to provide the last site of sediment storage along the Susquehanna River before sediment reaches Chesapeake Bay. This has benefited Chesapeake Bay by providing a means by which the quantity of fine-grained sediment and associated nutrients, sources of water quality impairment, reaching the Bay are reduced.”. OR. Strategy:. Relate sedimentary characteristics of ancient deposits (grain size, . sedimentary . structures, geometry) to features observed in modern rivers. Bedforms. during traction deposition from unidirectional flow. The . surface. features of the Earth change as a result of observable physical and chemical processes . Weathering and Erosion. This is a monument . called Cleopatra’s . Needle. It was carved in Egypt around 1450B.C. The sides are carved with hieroglyphs, the writing of ancient Egypt. It stood in the dry, hot Egyptian desert for over 3000 years. During that time, the hieroglyphs remained distinct.. 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.. __________, ___________, and __________ act together in a cycle that wears down and builds up Earth’s surface.. ________, ___________, __________, _______, and ________ all cause erosion.. _______ causes mass movement, the process that moves sediment downhill.. J. Quigley. 4/2012. Water Shapes the Land. Water Shapes the Land. The Mississippi River is like a thousand dump trucks… every year it carries more than 300 million tons of sediment to the ocean! . This sediment is being washed away from the surface of the land and is called erosion.. Lesson 1. Water Erosion. How does Moving Water Cause Erosion?. Erosion is the process in which sediment that has been broken down through weathering is moved.. Agents of Erosion are:. Water. Wind. Glacial (ice). Microbial assemblages (in biofilms) form sticky films that influence sediment deposition. Microbially. -bound sediments are stabilized and more cohesive. Microbialite. : a rock formed via the influence of microbial trapping, binding, and precipitation. TRANSPORT MEDIA. Gravity. . is the . simplest mechanism of sediment . transport.. It includes the . movement of particles under gravity . down a . slope. .. Rock falls generate piles of sediment at . Temu . ke-. 9. Sedimentary Rocks. Detrital/Siliciclastic Sedimentary Rocks. conglomerates & . breccias. sandstones. mudstones. Carbonate Sedimentary Rocks. limestones. dolostones. Other Sedimentary Rocks. The. . Erosion-Deposition. . Process. Constructive vs. Destructive. Constructive process build up features on Earth’s surface. Lave erupting from a volcano hardens and forms new land on the area where lava falls..