'Rating curve' diaporamas de présentation

ENVI 485 02/15/07

ENVI 485 02/15/07. INTRO. TO NATURAL HAZARDS & DISASTERS STEAMS AND FLOODING Case Study 1. Phase 1: Emergency (days). Normal activities stop Search and rescue Emergency shelter/feeding Capital damaged or destroyed. Phase 2: Restoration (weeks-months).

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Hydrologic Measurement

Hydrologic Measurement. Precipitation Evaporation Streamflow Channel Properties Topography GIS datasets. Reading: Applied Hydrology Chapter 6. Hydrologic Measurement. Water Quality Sampling. Precipitation, Climate, Stream Gaging. Precipitation Station. Tipping Bucket Raingage

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Hydrologic Measurement

Hydrologic Measurement. Precipitation Evaporation Streamflow Channel Properties Topography GIS datasets. Reading: Applied Hydrology Chapter 6. Hydrologic Measurement. Water Quality Sampling. Precipitation, Climate, Stream Gaging. Precipitation Station. Tipping Bucket Raingage

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Use of radars to monitor stream discharge by noncontact methods

Use of radars to monitor stream discharge by noncontact methods. J. E. Costa, 1 R. T. Cheng, 2 F. P. Haeni, 3 N. Melcher, 4 K. R. Spicer, 1 E. Hayes, 5 W. Plant, 6 K. Hayes, 6 C. Teague, 7 and D. Barrick 7. ??????? ???. Outline. Introduction

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Hydraulics for Hydrographers Channel Dynamics and Shift Corrections

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The Record Breaking Floods of March 2010

The Record Breaking Floods of March 2010. Edward J. Capone, CFM Service Coordination Hydrologist NWS/Northeast River Forecast Center http://weather.gov/nerfc. West Warwick, RI at 1030 am Wednesday 3/31/10. Outline.

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River Mechanics and Introduction to Unsteady Flow Equations

US Army Corps of Engineers Hydrologic Engineering Center. River Mechanics and Introduction to Unsteady Flow Equations. Objective : Present key items for switching from HEC-RAS steady flow analysis to HEC-RAS unsteady flow simulation. Michael Gee, Ph.D, PE Senior Hydraulic Engineer.

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Measure V (current-meter) at 0.2 and 0.8 of depth Average V and multiply by (width * depth)

Stream Cross-Section for Q. Measure V (current-meter) at 0.2 and 0.8 of depth Average V and multiply by (width * depth) Sum up across stream to get total Q = S (V i D i W i ).

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Plotting scales

Plotting scales. The type of scale used to plot ratings can dramatically affect their shape. Arithmetic scales. Logarithmic scales. The relation between water discharge and hydraulic head (h) is well known for standard artificial controls. V-NOTCH WEIR (90 degrees) Q = 2.5 h 2.5.

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Streamflow Measurement and Calculation

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RATING CURVE VALIDATION (1)

RATING CURVE VALIDATION (1). WHEN VALIDATION: ON FITTED RELATION WHEN NEW GAUGINGS BECOME AVAILABLE TO TEST CHANGE IN RATING AT LEAST 6 GAUGINGS AT STABLE SITES AT UNSTABLE SITES MORE GAUGINGS ARE NEEDED COVERING FULL FLOW RANGE TESTS: GRAPHICAL NUMERICAL. OHS - 1.

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Basic Hydraulics: Rating curve

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COMPUTATION OF DISCHARGE DATA

COMPUTATION OF DISCHARGE DATA. GENERAL: DISCHARGE CANNOT BE MEASURED DIRECTLY AND CONTINUOUSLY STAGE MEASUREMENTS h(t) ARE MADE CONTINUOUSLY OR AT FIXED INTERVALS h(t) IS CONVERTED INTO DISCHARGE Q(t) BY USING THE Q-h RATING CURVE

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Impacts of Uncertain Flow Data on Rainfall-Runoff Model Calibration

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