Download presentation
Presentation is loading. Please wait.
1
Civil and Environmental Engineering
Hydrologic modeling and prediction at continental scales: Model development and applications Dennis P. Lettenmaier Civil and Environmental Engineering CEE 500 Seminar December 2, 2004
2
Outline of this talk “Who we are, what we do”
Macroscale hydrologic model development and testing Selected model applications Arctic hydrology Historic drought analysis Westwide hydrologic forecasting
3
LAND SURFACE HYDROLOGY RESEARCH GROUP 2004
Jenny Adam Ali S. Akanda Kostas Andreadis Ted Bohn Elizabeth Clark Mariza Costa-Cabral Su Fengge Alan Hamlet Jordan Lanini Dennis Lettenmaier Nathalie Voisin Andrew Wood Seung-Oh Yu Qianru Zeng Chunmei Zhu
4
2) Macroscale hydrologic model development and testing
6
Variable Infiltration Capacity (VIC) Macroscale Hydrology Model
7
Investigation of forest canopy effects on snow accumulation and melt
Measurement of Canopy Processes via two 25 m2 weighing lysimeters (shown here) and additional lysimeters in an adjacent clear-cut. Direct measurement of snow interception
8
Calibration of an energy balance model of canopy effects on snow accumulation and melt to the weighing lysimeter data. (Model was tested against two additional years of data)
9
Summer 1994 - Mean Diurnal Cycle
Point Evaluation of a Surface Hydrology Model for BOREAS SSA Mature Black Spruce NSA Mature Black Spruce SSA Mature Jack Pine -100 100 300 Rnet -50 50 150 250 H 60 120 LE 3 6 9 12 15 18 21 24 Rnet H LE 3 6 9 12 15 18 21 24 Rnet H LE 3 6 9 12 15 18 21 24 Flux (W/m2) Local time (hours) Observed Fluxes Simulated Fluxes Rnet Net Radiation H Sensible Heat Flux LE Latent Heat Flux
10
Range in Snow Cover Extent
Observed and Simulated Eurasia North America J F M A S O N D Month Observed Simulated 4 8 12 16 20 snow cover extent (10 6 km 2 ) 10
11
UPPER LAYER SOIL MOISTURE
June 18th-July 20th, 1997 UPPER LAYER SOIL MOISTURE 0.40 0.10 0.20 0.30 SOIL MOISTURE (%) X TOPLATS regional ESTAR distributed TOPLATS distributed 11:00 CST JULY ESTAR TOPLATS 50 10 11:00 CST JUNE 20, 1997 Illinois soil moisture comparison
12
Mean Normalized Observed and Simulated Soil Moisture
Central Eurasia, 20°E 30°E 40°E 50°E 60°E 70°E 80°E 90°E 100°E 110°E 120°E 130°E 140°E 40°N 50°N 60°N A B C D E F G H 100 200 Soil Moisture (mm) J M S O N Normalized Observed Simulated
13
Cold Season Parameterization -- Frozen Soils
Key Observed Simulated 5-100 cm layer 0-5 cm layer
14
3) Selected model applications
15
a) Arctic hydrology
16
b) Continental U.S. drought analysis
17
c) Westwide hydrologic forecasting
18
Ongoing/planned work Arctic freshwater balance reconstruction and trend attribution Westwide forecast applications – extension to include assimilation of remote sensing data (esp. snow cover extent), increased forecast frequency (to weekly updates), inclusion of shorter lead times (7-14 days) Drought recovery analysis Global applications (and linkage with surface water mission proposal)
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.