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Factors Influencing Precipitation Distribution & Measurement Methods

Learn about how latitude, altitude, winds, and more affect rainfall patterns. Explore variability in precipitation over time and space using isohyetal maps. Discover different types of precipitation gauges for accurate measurement.

olivia-owen
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Factors Influencing Precipitation Distribution & Measurement Methods

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  1. Precipitations vFactors Affecting Geographical Distribution of Precipitation 1.     Latitude 2.     Altitude 3.     Distance from moisture source 4.     Prevailing winds 5.     Relation to mountain range 6.     Ground cover vVariability of Precipitation -     Time: due to seasonal variation. -     Space: Represented by isohyetal maps – map of contours of equal rainfall, called isohyet. - Observe orographic effect from rainfall isohyetal map - Spatial correlation of rainfall

  2. USA Monthly Rainfall Distribution

  3. Annual Rain Time Series at HKO

  4. Mean Monthly Rainfall Time Series at HKO

  5. Monthly Rainfall Time Series at Yuen Long

  6. Isohyet of 1990 HK Annual Total Rainfall

  7. Isohyet of Mean Annual Rainfall in HK

  8. Orographic Effect on M.A.P. in HK Locations of raingauges considered Mean annual rainfall vs. Elevation in HK

  9. Spatial Correlationof Monthly Rainfall

  10. Anisotropy of Monthly Rainfall

  11.   Measurement of Precipitation • Amount & intensity of precipitation • All forms of precipitation are measured on the basis of the • vertical depth of water that would accumulate on the level • surface if the precipitation remained where it fell. • Precipitation gauges: • ·   Recording gauges • ·   Tipping – bucket gauge • ·   Weighing type gauge • ·   Float recording gauge • ·   Radar and satellite

  12. Figures of Rain Gauges

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