GEOG 2300 1st Edition Lecture 25Outline of Last Lecture I. CyclonesII. Weather MapsIII. Hydrologic CycleOutline of Current Lecture I. Hydrologic CycleII. Evaporation and EvapotranspirationIII. PrecipitationIV. InterceptionV. InfiltrationCurrent LectureI. Hydrologic CycleA. Majority of water is ocean saltwater, of remaining water (2.8%) the majority is accounted for by glaciers and ice sheets and groundwater, only 0.001% occurs in the atmosphereB. Global water balance constantly cycles between these reservoirsC. The atmosphere is responsible for the largest flowD. Components: evapotranspiration, precipitation, interception (if trees are present), overland flow and runoff, surface water, infiltration, aquifer recharge, groundwater flow, oceansII. Evaporation and EvapotranspirationA. Evaporation: occurs over open bodies of waterB. Evapotranspiration: occurs when plants respire water into the atmosphereC. Can occur at a maximum rate called potential evapotranspiration when there is sufficient water available for the plants to respireD. When there is insufficient soil moisture available, plants respire at a reduced rate called actual evapotranspirationIII. PrecipitationA. Occurs as rain, freezing rain, sleet, hail, snow; rain and hail usually occur above freezing temperatureIV. InterceptionA. Occurs when leaves and branches intercept precipitation before it reaches the groundThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.B. Intercepted water is absorbed by the plant and transpired or evaporated backto the atmosphereV. InfiltrationA. Occurs when water at the surface sinks into the soilB. The soil will absorb water up to the infiltration capacity, beyond which water will flow over the surface as overland flowC. Infiltration capacity is high for sandy soils and low for clayey soilsD. Construction sites, urban areas, and haul roads produce large quantities of overland flowE. Overland flow will flow down slope and either sink into the soil, or enter a stream as
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