:: HYDROLOGIC RESEARCH CENTER : RESEARCH : MODELING ::

A main focus of research efforts at HRC is on development of accurate hydrologic models to simulate, estimate, and predict channel flow and river discharge. However, hydrologic modeling at HRC involves a broad range of atmospheric and land surface processes including surface and air temperature, evapo-transpiration, soil moisture, snowmelt, overland flow and ground infiltration, precipitation process and methods of precipitation estimation. Past and current research at HRC focuses on precipitation processes such as cloud and rainfall microphysics, spatial and temporal variability of convection, and other convective processes. HRC's hydrologic models are used for real-time flash flood warning, channel and river discharge prediction out to 90 days, as well as historical and future climate simulations spanning decades.

HRC develops and employs statistical and dynamical weather, climate, and hydrologic models to understand global and regional climate variability on seasonal to paleoclimatic time scales, to improve seasonal and longer term forecasts, and to understand the fundamental mechanisms of climate change in past, present, and future climate scenarios. Besides hydrology, modeling studies at HRC have focused on the thermal structure and circulation of the oceans and atmosphere, ocean waves, the ENSO cycle, land surface/atmosphere interactions, and ties between climate, human health and hydrology.

Georgakakos, K.P., 2005: "Analytical results for operational flash flood guidance", Journal of Hydrology (in press).
Andrieu, H., French, M., Krajewski, W.F., and K.P. Georgakakos, 2003: "Stochastic-Dynamical Rainfall Simulation Based on Weather Radar Volume Scan Data," Advances in Water Resources, Vol. 26, 581-593.(Abstract)
Carpenter, T.M., K.P. Georgakakos, and J.A. Sperfslage, 2001: "On the Parametric and Nexrad-Radar Sensitivities of a Distributed Hydrologic Model Suitable for Operational Use," Journal of Hydrology, 253, 169-193. (Abstract)
Carpenter, T.M, J.A. Sperfslage, K.P. Georgakakos, T. Sweeney and D.L. Fread, 1999:"National Threshold Runoff Estimation Utilizing GIS in Support of Operational Flash Flood Warning Systems," Journal of Hydrology, 224, 21-44. (Abstract)
Pandey, G.R., D.R. Cayan, and K.P. Georgakakos, 1999: "Precipitation Structure in the Sierra Nevada of California," J. of Geophysical Research, 104(D10), 12019-12,030.(Abstract)
Tsintikidis, D. and K.P. Georgakakos, 1999: "Microphysical and Large-Scale Dependencies of Temporal Rainfall Variability over a Tropical Ocean," Journal of the Atmospheric Sciences, (56) 724-748. (Abstract)
Tsintikidis, D., Georgakakos, K.P., Artan, G.A., and A.A. Tsonis, 1999: "A Feasibility Study on Mean Areal Rainfall Estimation and Hydrologic Response in the Blue Nile Region Using METEOSAT Images," Journal of Hydrology, 221, 97-116. (Abstract)
Kim, J., N.L. Miller, A.K. Guetter, and K.P. Georgakakos, 1998: "River Flow Response to Precipitation and Snow Budget in California During the 1994-1995 Winter," Journal of Climate, 11, 2376-2386. (Abstract)
Tsintikidis, D. and G.J. Zhang, 1998: "A Numerical Study on the Coupling between Sea Surface Temperature and Surface Evaporation," Journal of Geophysical Research-Atmospheres, 103(D24), 31763-31774. (Abstract)
Apostolopoulos, T.K., and K.P. Georgakakos, 1997: "Parallel Computation for Streamflow Prediction with Distributed Hydrologic Models," J. of Hydrology, 197, 1-24. (Abstract)
Tsintikidis, D., J.L. Haferman, E. Anagnostou, W.F. Krajewski, and T.F. Smith, 1997: "A Neural Network Approach to Estimating Rainfall from Spaceborne Microwave Data", IEEE Transactions on Geoscience and Remote Sensing, 35(5), 1079-1093. (Abstract)
Georgakakos, K.P., and W.F. Krajewski, 1996: "Statistical-Microphysical Causes of Rainfall Variability in the Tropics," J. Geophysical Research, 101(D21), 26,165-26,180. (Abstract)
Guetter, A.K., and K.P. Georgakakos, and A.A. Tsonis, 1996: "Hydrologic Applications of Satellite Data: Part 2. Flow simulation and Soil Water Estimates", J. of Geophysical Research-Atmospheres, 101(D21), 26,527-26, 538. (Abstract)
Bae, D-H., K.P. Georgakakos, 1994: "Climatic Variability of Soil Water in the American Midwest: Part 1. Hydrologic Modeling," Journal of Hydrology, 162, 355-377. (Abstract)

Modeling