In the Puget Sound landslides are fairly common‚ mostly due to a very wet climate and ever changing environment. The definition of a landslide is: A gravity driven down slope movement of a mass composed of soil‚ rock‚ and vegetation. A landslide generally happens when the material in the down slope is heavier then the supporting soil. There are many contributing factors that cause landslides‚ steepness of slope‚ composition of soil and rock‚ groundwater condition‚ recent precipitation patterns
Premium Geomorphology Geology Erosion
LO2 a) Erosion Moving masses of ice (glaciers) cause erosion‚ and as a result change landscapes dramatically. There are 3 processes that cause direct glacial erosion: o Abrasion o Crushing o Plucking Meltwater erosion is an indirect process of erosion. Abrasion Rock fragments at the base of the glacier grind against the bedrock wearing down it’s surface. As a result‚ the surface becomes smooth. These smoothed bedrock surfaces are called striations. Fine silt particles are formed‚ called rock flour
Premium Water Earth Erosion
| | | | | | | | | The Erosion Process1. Water. Erosion from water typically occurs in the following ways. a. Raindrop Splash and Sheet Erosion. The first step in the erosion process begins as raindrops impact the soil surface. Raindrops typically fall with a velocity of 20-30 feet per second. The energy of these impacts are sufficient to displace soil particles as high as two feet vertically. In addition‚ the impact of a rainfall on a bare soil can compact the upper layer of
Premium Erosion Geomorphology Soil
The upper course of the river starts at the source of the rivers channel. The upper course of the river is shallow and has a narrow river channel due to vertical erosion caused by hydraulic action and corrosion. It also has an uneven steep river bed due its bedload as it is large boulders as they have rough edges. This then gets transported through the upper part of the river by traction. In addition some of the bedload also gets transported by suspension and little in siltation. As the river flows
Premium Geomorphology Erosion
Watershed Characteristics 1. Drainage Area the drainage area and it is the most important watershed characteristic for hydrologic analysis. It reflects the volume of water that can be generated from a rainfall. Thus the drainage area is required as input to models ranging from simple linear prediction equations to complex computer models. Once the watershed has been delineated‚ its area can be determined‚ either by approximate map methods or by GIS. 2. Drainage Density The drainage density‚ D
Premium Hydrology Water Surface runoff
Physical Geography Filed Work The aim of this field work was to study the long profile and its characteristics of the River Lym. The velocity then drops at the mouth where it tends to deposit its load The velocity then drops at the mouth where it tends to deposit its load This is the general long profile of the river where the gradient decreases as you go down the river. The source is highest point of the river basin which usually is a mountain. This is the general long profile of the river
Premium Geomorphology English Channel River
7.2 vocab * Alluvial fan- a fan shaped deposit of sediment formed when a streams slope is abruptly reduced * Playa lake- a flat area on the floor of an undrained desert basin (playa) that fills and becomes a lake after heavy rain 7.2 outline * Weathering in Deserts: Although chemical weathering occurs in deserts‚ mechanical weathering is far more dominant in shaping desert landscapes. * Water in Deserts: In desert‚ water collects in streams and rivers that can deposit alluvial
Premium Sediment Erosion Geomorphology
Soil Erosion Erosion is a natural process by which rock and soil are broken loose from the earth’s surface at one location and moved to another. Soil erosion forms and changes land by wearing down mountains filling valleys‚ and making rivers appear and disappear. Erosion is usually a slow and gradual process that occurs over the course of thousands or millions of years. However the rate of erosion can be speeded up by such human activities as mining. How erosion occurs? Ero0sion begins with
Premium Soil Erosion Agriculture
Why is flooding prone to Bangladesh? Bangladesh suffers from regular and extreme flooding for the following reasons‚ first being that its one meter above sea level‚ as well as it being a LEDC meaning it’s a less economical developed country. The rivers leading from the Himalayas flow into the sea‚ when they suffer with heavy rain the excess water starts to over flow and flood and waterlog land and surroundings. The physical causes are‚ the monsoon climate brings very heavy rain and snow‚ and soils
Premium River Soil Water
Mass wasting is defined as the down slope movement of rock and regolith near the Earth’s surface mainly due to the force of gravity. Rock slides and debris slides result when rocks or debris slide down a pre-existing surface‚ such as a bedding plane‚ foliation surface‚ or joint surface. On February 17‚ 2006 the Philippines was hit by landslides. In Southern Leyte mudslides destroyed the mountain village (Barangay) Guinsaugon. During schooltime between 9 a.m. and 10 a.m.‚ an elementary school was
Premium Geomorphology Rain Geology