水土保持英文课件6 Soil and Water Conservation-Wang Min.ppt,Soil and Water Conservation Wang Min (王敏) (School of Water Engineering and Building) Soil Erosion What’s soil erosion? Erosion is the process of detachment and transport of soil particles by
SoilandWaterConservation WangMin(王敏) (SchoolofWaterEngineeringandBuilding) SoilErosion What’ssoilerosion? Erosionistheprocessofdetachmentand transportofsoilparticlesbyerosiveagents (Ellison,1944). Erosionisanaturalgeologicprocess. WATEREROSION WINDEROSION Wind Erosion Water Erosion SOILEROSIONIS AGLOBALPROBLEM...
Modeling water distribution and flow in partially-saturated soils requires knowledge of the SWC, therefore plays a critical role in water management and in prediction of solute and contaminant transport in the environment. Typically a SWC is highly nonlinear and is relatively difficult to obtain ...
Soil Damage water Gully Soil Damage – Wind Erosion Dust Bowl What is soil conservation? Soil conservation is a method to maintain the fertility of the soil by protecting the soil from erosion and nutrient loss Windbreaks Retaining Walls Ground cover (vegetation) Terracing Changes one steep slope ...
Change in groundwater and total water storage indicates storage depletion in the basin. Storage depletion in the region is driven mainly by groundwater IRR and ET loss. Despite the low PPT and high ET, there is narrowing seasonal trend in soil moisture. This is achieved at the expense of ...
Physical properties – Color covaries with O.M. Fe and Al oxides moisture saturation mineralogy (e.g., calcite, hematite=Fe2O3) Color “quantified” using the Munsell system Hue (e.g., 10YR) tells you general shade (red, yellow); DOES NOT tell you how dark the soil is Value (e....
自然地理学课件DLX07soil4distribution Thedistributionofsoil macro-terrain(宏观) Terrain(中域)Thesoildistributioninmicroterrain(微域)Tillagesoil’sdistribution(耕作土壤) Thedistributionofsoilinmacro-terrain Thematchingcasessoilwith topographyparentrockshydrology...
Soilwater土壤中的水Originatesasprecipitation降水的起源Waternotboundtosoilparticlesorabsorbedbyrootsleachesthroughvariouslayersandcarriesminerals水并不是绑定于土壤中,而是通过各种滤层或矿物质被根系吸收Depositionofleachedmaterialisilluviation浸出物的沉积是沉积作用Leachedmaterialscanreachgroundwater浸出物可到达地下水 So...
Weathering When minerals are exposed to weather, they begin to break down into smaller pieces. This is mostly done by heating and cooling of the minerals and rock. Weathering Some minerals are water soluble which means they dissolve when exposed to water. Some rocks may contain some minerals th...
4. Erosion Causes loss of soil by water and wind If one knows history of land can then do something to prevent more losses 4. Erosion Calculation One will be given original topsoil To find current topsoil drag knife through top layer until it stops. This is the topsoil ...