GEOG 1280 Lecture 29: Lecture 29
17 May 2017
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Document Summary
1 links various characteristics of meteorological or hydrological drought to agricultural impacts, focusing on precipitation shortages, difference between actual and potential evapotranspiration, soil water deficits, usually linked to fairly short term where crop yields are affected. Plant water demand depends on prevailing weather conditions, biological characteristics of the specific plant, its stage of growth, and the physical and biological properties of the soil. 1 is associated with the effects of periods of precipitation shortfalls or subsurface water supply (i. e, streamflow, reservoir and lake levels, groundwater) usually requires long term to manifest. The frequency and severity of hydrological drought is often defined on a watershed or river basin scale. Although all droughts originate with a deficiency of precipitation, hydrologists are more concerned with how this deficiency plays out through the hydrologic system. Hydrological droughts are usually out of phase with or lag the occurrence of meteorological and agricultural droughts.
