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Watershed Hydrology in Hawaii: Exploring Moisture and Surface Water Management

Dive into the evaluation of natural resource management in Hawaii from a watershed hydrology perspective. Explore the influence of moisture in the atmosphere on evaporation and precipitation, delve into surface water hydrology concepts, learn about watershed delineation, river components, and ecological zones. Discover the importance of topographic maps in resource management and rainfall spatial distribution analysis. Gain insight into precipitation estimation methods and the impact of fog interception on water budgets in tropical forests.

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Watershed Hydrology in Hawaii: Exploring Moisture and Surface Water Management

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  1. Evaluation of Natural Resource Management:Watershed Hydrology, a Hawaiian Prospective Ali Fares Associate Professor of Watershed Hydrology NREM600: Evaluation of Natural Resource Management

  2. Moisture in Atmosphere! • Moisture is added to atmosphere through evapotion. • Water vapor in air exerts partial pressure called vapor pressure • The relationship among moisture content in the atmosphere, temperature and vapor pressure determine the occurrence and amounts of evaporation & precipitation see Figure. • RH is ratio of VP (ea) to saturation VP (es) at a given temperature. • Vapor pressure deficit • Dew point temperature NREM600: Evaluation of Natural Resource Management

  3. Moisture in the Atmosphere lnes = 21.382 – 5347.5/T NREM600: Evaluation of Natural Resource Management

  4. SURFACE WATER HYDROLOGY. What Is Surface Water Hydrology? Watersheds. Delineating a Watershed. P O L I C Y I S S U E. Overland Flow. Rivers. Components of a River. River Morphology. Types of Rivers. Gradient. Lakes. Types of Lakes. Ecological Zones. Thermal Cycles. Seiches. Transport and Deposition. Velocity. Sediment Load. Water Measurement. Overland Flow. River Discharge. Water Storage in Lakes and Reservoirs. Flood Events. Flood Frequency. Probable Maximum Precipitation. Probable Maximum Flood. G U E S T E S S AY GIS and Flooding by Jake Freier. P O L I C Y I S S U E. Lecture Outline NREM600: Evaluation of Natural Resource Management

  5. Hydrology • The scientific study of the properties, distribution, and effects of water on the earth's surface, in the soil and underlying rocks, and in the atmosphere. • HYDROLOGY is the science of water that is concerned with the origin, circulation, distribution and properties of water of the earth. NREM600: Evaluation of Natural Resource Management

  6. What’s a Watershed? • WATERSHED, or CATCHMENT, is a topographic area that is drained by a stream, that is, the total land area above some point on a stream or river that drains past that point. • The watershed is often used as a planning or management unit. Natural environment unit. NREM600: Evaluation of Natural Resource Management

  7. Topo Maps • The USGS took over responsibility for mapping the country in 1879 and has been the primary civilian mapping agency of the United States ever since. • The best known USGS maps are the 1:24,000-scale topographic maps, also known as 7.5-minute quadrangles. • More than 55,000 7.5-minute maps were made to cover the 48 conterminous States. • This is the only uniform map series that covers the entire area of the United States in considerable detail. NREM600: Evaluation of Natural Resource Management

  8. NREM600: Evaluation of Natural Resource Management

  9. Ala Wai Canal Watershed NREM600: Evaluation of Natural Resource Management

  10. Rainfall / Precipitation Spatial Distribution NREM600: Evaluation of Natural Resource Management

  11. Formation of rainfall on a tropical island NREM600: Evaluation of Natural Resource Management

  12. Rain Spatial Distribution, Windward 60m 2,500 mm 1570m 9,400 mm NREM600: Evaluation of Natural Resource Management

  13. Precipitation Estimation NREM600: Evaluation of Natural Resource Management

  14. Precipitation Estimation NREM600: Evaluation of Natural Resource Management

  15. Precipitation Estimation NREM600: Evaluation of Natural Resource Management

  16. Precipitation Estimation NREM600: Evaluation of Natural Resource Management

  17. Precipitation Estimation NREM600: Evaluation of Natural Resource Management

  18. Precipitation Estimation NREM600: Evaluation of Natural Resource Management

  19. Rainfall spatial distribution NREM600: Evaluation of Natural Resource Management

  20. Rainfall Spatial Distribution PRIZM model Site-specific Interpolation NREM600: Evaluation of Natural Resource Management

  21. Oahu, October 30th 2004 NREM600: Evaluation of Natural Resource Management

  22. Precipitation Measurement The Standard Fog Collector (Schemenauer and Cereceda, 1994) NREM600: Evaluation of Natural Resource Management

  23. Fog Interception • Despite the extremely high rainfall in the area fog remains a substantial part of the water budget of these forests, especially at altitudes between 600 and 2000 meters. • Fog interception may range between 126% and 367% of what is collected by a standard rain gage. NREM600: Evaluation of Natural Resource Management

  24. Fog drip in tropical cloud forests on East Maui, Hawaii • Cloud water interception adds significantly to rainfall at both dry (leeward) and wet (windward) cloud forest sites in Hawai'i. • Cloud water interception was equivalent to 268 mm yr-1 at Auwahi and 1073 mm yr-1 at Waikamoi. • Measured throughfall was about 65% of incident rainfall at Auwahi, and 119% of incident rainfall at Waikamoi. • Throughfall was dominated by rainfall at both the Waikamoi and Auwahi sites, and was significantly influenced by fog only at the windward site. Scholl et al. 2004 NREM600: Evaluation of Natural Resource Management

  25. Precipitation Canopy Interception NREM600: Evaluation of Natural Resource Management

  26. Rain Canopy Interception NREM600: Evaluation of Natural Resource Management

  27. Water Balance NREM600: Evaluation of Natural Resource Management

  28. Infiltration • Infiltration is the actual rate at which water is entering the soil at any given time(SCSA, 1976). • Infiltration capacity: Maximum rate (LT-1). NREM600: Evaluation of Natural Resource Management

  29. Double ring infiltrometer Tension infiltrometer Guelph Permeameter Xiaodong, 2002 Measuring infiltration NREM600: Evaluation of Natural Resource Management

  30. Surface Water NREM600: Evaluation of Natural Resource Management

  31. Tsihrintzis, 2002 What are the components of a Hydrograph? NREM600: Evaluation of Natural Resource Management

  32. NREM600: Evaluation of Natural Resource Management

  33. Runoff variability: monthly stream discharge NREM600: Evaluation of Natural Resource Management

  34. Runoff variability: instantaneous stream discharge NREM600: Evaluation of Natural Resource Management

  35. Trends in Streamflow Characteristics in HI NREM600: Evaluation of Natural Resource Management

  36. NREM600: Evaluation of Natural Resource Management

  37. NREM600: Evaluation of Natural Resource Management

  38. USGS stream-gaging stations in HI NREM600: Evaluation of Natural Resource Management

  39. Trends in Streamflow Characteristics in HI • Analysis of trends in base flow (ground-water discharge to streams) provides insight related to changes in ground-water storage, whereas analysis of trends in total flow (base flow plus direct runoff) provides insight related to changes in actual flow in the stream as well as changes in high flow. • Statistically significant downward trends in annual base flow during 1913–2002 were detected at all seven stations. • Long-term downward trends in base flow are consistent with long-term downward trends in rainfall over much of the State during this period. • Thus, the downward trends in base flow at the long-term-trend stations may be representative of many other streams throughout the State as well. NREM600: Evaluation of Natural Resource Management

  40. Precipitation measurement: throughfall NREM600: Evaluation of Natural Resource Management

  41. Precipitation measurement: fog interception The Standard Fog Collector (Schemenauer and Cereceda, 1994) NREM600: Evaluation of Natural Resource Management

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