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Floodplains are wide, flat plains formed by fine rock particles deposited during periodic river flooding, while deltas are flat lands formed at river mouths by sediment deposition over time. Floodplains are built up through repeated flooding that deposits alluvium onto the adjacent land when rainfall overwhelms the river's capacity. Similarly, deltas are formed through gradual accumulation of alluvium at coastal river mouths in areas with shallow waters, weak currents and large sediment loads from rivers.
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Rivers Revision
This document provides information about rivers and flooding, including:
1) It discusses the hydrological cycle and river landforms like meanders, ox-bow lakes, and deltas. Biological, freeze-thaw, and chemical weathering are explained.
2) Methods for managing flooding are examined, including both "hard" options like building flood defenses, and "softer" options like restoring floodplains.
3) Practice questions are provided about river features and processes like waterfall formation. Diagrams and explanations of answers are given.
Rivers revision
This document provides information about rivers and flooding, including:
1) It discusses various river landforms and processes like meanders, floodplains, estuaries, and deltas. It also explains how v-shaped valleys and waterfalls are formed.
2) It covers causes of flooding like rainfall, soil permeability, and human impacts such as deforestation, farming, and urbanization.
3) It introduces hard and soft flood management options and provides examples like flood defenses and restoring natural floodplains. Practice questions are included about these topics.
Revision lesson 40 minutes
This document provides an overview of physical geography concepts related to rivers and coasts. It discusses the key processes that shape river landscapes including erosion, transportation, and deposition. It explains how rivers form V-shaped valleys and meanders. It also covers coastal landforms such as deltas, spits and cliffs, and the processes of longshore drift and coastal erosion. Examples are given of river flooding including the Boscastle floods of 2004 and factors influencing storm hydrographs.
13.4 Stages of a River.ppt
Floodplains develop alongside rivers and are subject to periodic flooding. As rivers mature from steep mountain streams to slow, meandering plains rivers, they develop floodplains marked by features like natural levees, backswamps, and oxbow lakes formed from river meanders. Flooding deposits sediment across the floodplain but slows closer to the river, building up levees. Meanders may eventually be cut off, forming oxbow lakes. While flooding is natural, it can be hazardous to human development, so structures like dams, levees, flood walls, and bypasses are used to control floodwaters.
River and landforms by rivers
This document discusses river landforms and processes. It begins by defining a river and explaining fluvial processes. It then discusses key aspects of river systems such as tributaries, floodplains, and meanders. Different drainage patterns like dendritic, parallel and trellis are described. The document also covers stream discharge, perennial and non-perennial streams, erosion types, sediment load and transportation methods. Finally, it summarizes the landforms created by upper, middle and lower course rivers such as V-shaped valleys, waterfalls, meanders, ox-bow lakes and deltas.
Naturalists at Large: Rivers watersheds
The streams found in mountains are likely young, with V-shaped valleys and steep gradients. They move fast upstream, carrying large rocks and boulders, but slow downstream where they deposit small silts and clays. This sorting process forms the soils in valleys. Grand Canyon took 1-3 million years to form as the river cut through rock. Rivers slow and widen as they approach base level, forming broad floodplains and meanders.
Chapter 7, Lesson 2 - Landforms
This document defines and describes various landforms created by water and erosion processes, including runoff, tributaries, watersheds, meanders, flood plains, deltas, water gaps, canyons, valleys, dunes, and landslides. It explains key terms like sediment, tributaries that feed into rivers, watershed areas, and landforms shaped by river currents, flooding, sediment deposition, and erosion from water and wind. The document provides definitions and brief descriptions of common landforms.
Evolution of landform
This document summarizes the normal cycle of erosion by fluvial processes. It describes the three stages: youth, mature, and old. In the youth stage, the river flows steeply, forming V-shaped valleys, gorges, and waterfalls through vigorous erosion. In the mature stage, the river gradient decreases and deposition begins, forming landforms like meanders, ox-bow lakes, and floodplains. In the old stage, the river gradient is low and deposition dominates, forming deltas at the river's mouth. The ideal cycle ends with the formation of a peneplain, but crustal instability prevents most landscapes from reaching this final stage.
Relief
This document discusses different types of landforms on Earth including continental and oceanic relief. It describes how tectonic plates move and collide, forming three main types of plate boundaries. It also explains key landforms shaped by rivers, glaciers, groundwater and lakes. Coastal landforms like cliffs, beaches and estuaries are presented. The document emphasizes how plate tectonics and erosion by water have created the diverse surface features visible around the world today.
River landforms
This document summarizes various landforms created by rivers in different sections of their courses. In the upper course, waterfalls and rapids form where hard rock layers are exposed. In the middle course, meanders form as the gradient lessens and ox-bow lakes are created when meander loops are cut off. Floodplains and fluvial terraces are deposited during flooding. Near the mouth, deltas form in tideless seas and estuaries form where tidal currents meet river discharge.
Sec 3 Rivers
The document discusses various topics related to river drainage basins and processes:
1. It defines a drainage basin as an area of land drained by a river and its tributaries, with watersheds separating adjacent basins.
2. River patterns like dendritic, trellis, and radial are described as related to the underlying rock types.
3. Factors like river velocity, volume, and energy are discussed in relation to gradient, channel roughness, shape, basin size, vegetation, and climate.
Rivers Revision
The document provides information about river processes and landforms, including a case study of the River Tees in England. It discusses the different features formed by erosion and deposition in the upper, middle, and lower courses of the river. These include waterfalls, meanders, ox-bow lakes, levees, and deltas. It also describes human interactions with rivers, including river management through strategies such as dredging, flood prevention schemes, and the use of dams and reservoirs. The case study of the River Tees illustrates these concepts and shows how the river has been developed for industry, housing, and ports in its lower course.
Engineering Geology
This document discusses various geological processes and landforms resulting from physical geology. It covers the geological work of rivers including erosion, transportation, deposition and various fluvial landforms. It also discusses the geological work of other agents like wind, groundwater and oceans. Rivers can erode, transport and deposit sediment, forming features like drainage patterns, valleys, waterfalls and terraces over long periods of time. Wind erosion can form dunes and loess deposits, while groundwater can dissolve rock to form sinkholes, caves and valleys. Oceans also erode, transport and deposit material along coastlines.
River
Geomorphology is the study of landforms on Earth's surface. Geomorphologists study landforms and examine their origins and how they impact human activity. Rivers play a key role in shaping landscapes through various processes like erosion, transportation, and deposition of sediments. As a river progresses through its youthful, mature, and old stages, it forms characteristic landforms like V-shaped valleys, meanders, floodplains, ox-bow lakes, and deltas.
River land forms
Rivers form distinctive landforms through the processes of erosion, transportation, and deposition. Potholes are formed by turbulent water swirling pebbles in a depression, enlarging it over time through abrasion. Rapids occur where bands of hard rock protrude in a river, causing turbulence and mini waterfalls. Waterfalls are formed where a river spills over a sudden change in gradient, undercutting and eroding rocks.
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Humanities powerpoint
- 1. Floodplains and Deltas By William. Geon,Julie and Brenda
- 2. Floodplains A wide and flat plain built up by alluvium deposited on the valley floor after repeated flooding. Alluvium- Fine rock particles deposited by a river How are floodplains formed? Built up by fine rock particles deposited by the river during floods. In times of heavy rainfall, the river could not carry all the water, then the water floods the land beside the river. River carries a large amount of alluvium
- 4. Deltas A flat piece of land formed by layers of alluvium deposited at the river mouth over time. The alluvium is fine rocks particles deposited by river Delta is formed if: 1. sea is shallow-mouth is gently sloping 2.currents and waves are weak(Along the Coast) 3.river carries a large amount Greek letter-triangle
- 6. Thank you