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Understanding Hydrology: Precipitation, Water Balance, and Energy Partitioning

In this lecture, we explore key concepts in applied hydrology, focusing on the partitioning of precipitation into evaporation, groundwater recharge, and runoff. We will discuss the factors affecting these processes across different geographic locations. Additionally, we will analyze the development of a closed water balance using rainfall and streamflow data for watersheds. We will also compare equations for water flow velocity in streams and aquifers and examine how net radiation is partitioned into latent, sensible, and ground heat.

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Understanding Hydrology: Precipitation, Water Balance, and Energy Partitioning

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  1. CE 394K.2 Hydrology, Lecture 2 • Reading for Tuesday: Applied Hydrology, Chapter 2. • Literary quote for today: “The quality of mercy is not strain’d It droppeth as a gentle rain from heaven Upon the place beneath: it is twice blest; It blesseth him that gives and him that takes” Portia to Shylock, Act IV Scene I “The Merchant of Venice” by Shakespeare

  2. Questions for discussion on Tuesday (from Chapters 1 and 2 of Text) • How is precipitation partitioned into evaporation, groundwater recharge and runoff and how does this partitioning vary with location on the earth? • Can a closed water balance be developed using discrete time rainfall and streamflow data for a watershed? • How do the equations for velocity of water flow in streams and aquifers differ, and why is this so? • How is net radiation to the earth’s surface partitioned into latent heat, sensible heat and ground heat flux and how does this partitioning vary with location on the earth?

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