the causes of river flooding

 


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River Processes

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Four processes by which the river erodes its channel. 1.Hydraulic action 2.Corrasion 3.Attrition 4.Corrosion Explanations and pictures: 1. Hydraulic Action Hydraulic action is the process by which the physical force of moving water erodes the riverbed and banks. As water flows, it exerts pressure on the surfaces it encounters, particularly in areas of high velocity. This pressure can infiltrate cracks and fissures in rocks, leading to dislodgement as the water forces air out and creates a vacuum effect. Over time, repeated cycles of pressure changes weaken rock structures, causing pieces to break off and be carried downstream. This process is especially effective in softer or fractured rock types, contributing significantly to the overall erosion of river channels.  2. Corrasion Corrasion, occurs when sediment particles carried by the river grind against the channel surfaces. As the river flows, it transports various sizes of sediment—from fine silt to larger boulders—depending on ...
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advantages and disadvantages of wetland areas

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The advantages and disadvantages of wetland areas such as flood plains and deltas Wetland areas are ecosystems where water is present at or near the soil surface for significant periods, supporting unique plant and animal life adapted to wet conditions. Advantages of Wetland Areas Water Purification: Wetlands act as natural filters, trapping pollutants and sediments from surface runoff before they reach larger water bodies. This purification process improves water quality and can be more cost-effective than traditional treatment facilities, significantly benefiting ecosystems downstream. Flood Control: Wetlands serve as natural sponges, absorbing excess water during heavy rainfall or flooding events. By slowing down water flow and storing floodwaters, they reduce the risk of flooding in adjacent areas, protecting communities and infrastructure. Biodiversity Support : Wetlands are among the most biologically diverse ecosystems, providing habitats for a wide variety of plants and anima...
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