PPT-Hydrologic Losses Infiltration, Evaporation and Transpiration

Hydrology and Water Resources RSGIS Institute of Space Technology October 11 amp 23 2013 Infiltration Percolation Seepage Infiltration Water moving into soil by crossing the soil surface. Evapotranspiration. P. = Q + . ET. + G + . Δ. S. Evaporation. Transfer of H. 2. O from liquid to vapor phase. Diffusive process driven by . Saturation (vapor density) gradient ~ (. r. s. – . r. Evaporation is the process in which a liquid changes to the gaseous state at the free surface, below the boiling point through the transfer of heat energy . The rate of evaporation is depended on the The Hydrologic Cycle. General Topics. Evaporation. Transpiration. Condensation. Precipitation – interception, infiltration, depression storage, Overland Flow. Stream Hydrographs. Rainfal. -Runoff. Storm Duration Curves. Evapotranspiration. P. = Q + . ET. + G + . Δ. S. Evaporation. Transfer of H. 2. O from liquid to vapor phase. Diffusive process driven by . Saturation (vapor density) gradient ~ (. r. s. – . r. engineeringhydrology,runoffthemainareainterestSo,evaporationtranspirationphasesaretreated“losses” precipitationnotavailableforsurfacerunoffconsidered“loss”,thenthefollowingprocesse Evapotranspiration or ET. 62% of precipitation that falls on the continents is evaporated. Understanding and predicting climate change. Q=P-ET. P-ET is the water available for use. ET "loss" supports ecosystems and agriculture. David Tarboton. (Richard Peralta today). Overview. Handouts. Syllabus. Schedule. Student Information Sheet. Homework 1. Web: . http://www.engineering.usu.edu/dtarb/cee3430. . Outline for today. Review Syllabus and Schedule. How is evaporation measured?. How is evaporation estimated?. Reading: Applied Hydrology Sections 3.5 and 3.6. With assistance from Dan Siegel and Marcy Litvak. Evaporation. What is evaporation?. How is evaporation measured?. and . Water . Budget, Part 1. . . Tamlin Pavelsky, Associate Professor of Global Hydrology. Department of Geological Sciences. University of North Carolina. San Diego, CA. Fairbanks, AK. Mean Annual . CEVE 412/512. Dr. Phil Bedient. Jan 2016. Hydrology and Floodplain Analysis. Chapter 2. Sections . 2.4 . – . 2.9 . Applications of Unit Hydrographs. Hydrology and Floodplain Analysis, Chapter 2.4. LECTURE 1. REFERENCE BOOKS. Awan . N. . M, . Surface Water Hydrology (Vol-1), National Book Foundation, Islamabad Pakistan.. Chow . Ven. . Te. , David R. . Maidment. , Larry W. . Mays, . Applied Hydrology, McGraw Hill Book International Edition.. Learning Objectives. Be able to . calculate. Evaporation from a lake or reservoir using the following methods. Energy Balance (p304). Aerodynamic Method (p307). Combined Method (p309). Priestley-Taylor (p309). Water entering the soil at the ground surface . It replenishes the soil moisture deficiency and the excess moves downward by force of gravity called deep seepage or percolation and builds up the ground water table . “Net rate of vapor transport to the atmosphere”. Reverse process of precipitation. Evaporation considered to be a problem for reservoirs storage on one hand may prove very valuable on the other hand .