Timothy Hanrahan
Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352
tim.hanrahan@pnl.gov
Biography
Dr. Hanrahan's professional interests and research focus on large river processes, particularly fluvial geomorphology and associated interactions with aquatic organisms and their habitats. Current and recent research includes assessing aquatic habitat effects resulting from fluctuating large river flow regimes and hydroelectric dam modifications. Areas of expertise include river hydraulics and sediment transport, assessment and modeling of aquatic habitats, and evaluation of groundwater/surface water interactions in rivers. In addition to his employment at PNNL, he is an adjunct professor in the School of Earth and Environmental Sciences at Washington State University where he teaches Fundamentals of Environmental Hydrology.
Research Interests
- Aquatic habitat evaluation and modeling
- Fluvial geomorphology
- Large river ecology
- Geographic information systems
- Riverine Processes and Ecology Program
Education and Credentials
- Ph.D., Environmental Science (surface hydrology), Washington State University, 2006
- M.S., Natural Resource Science, Washington State University, 1993
- B.S., General Sciences, University of Wisconsin, 1989
Selected Publications
2009
- Leek R, JQ Wu, L Wang, TP Hanrahan, ME Barber, and H Qiu. 2009. "Heterogeneous characteristics of streambed saturated hydraulic conductivity of the Touchet River, south eastern Washington, USA." Hydrological Processes 23(8):1236-1246.
2008
- Hanrahan TP. 2008. "Effects of river discharge on hyporheic exchange flows in salmon spawning areas of a large gravel-bed river." Hydrological Processes 22(1):127-141. doi:10.1002/hyp.6605
- Xie YL, CJ Murray, TP Hanrahan, and DR Geist. 2008. "Data Mining on Large Data Set for Predicting Salmon Spawning Habitat." In Proceedings of The 2008 International Conference on Data Mining (DMIN'08), vol. 1, ed. R. Stahlbock, S. F. Crone and S. Lessmann, pp. 233-239. CSREA Press, Athens, NV.
- Geist DR, CJ Murray, TP Hanrahan, and YL Xie. 2008. "A model of the effects of flow fluctuations on fall Chinook salmon spawning habitat availability in the Columbia River." North American Journal of Fisheries Management 28(6):1894-1910. doi:10.1577/M07-074.1
- Geist DR, EV Arntzen, CJ Murray, K McGrath, YJ Bott, and TP Hanrahan. 2008. "Influence of river level on temperature and hydraulic gradients in chum and fall Chinook salmon spawning areas downstream of Bonneville Dam, Columbia River." North American Journal of Fisheries Management 28(1):30-41.
2007
- Hanrahan TP. 2007. "Bedform morphology of salmon spawning areas in a large gravel-bed river." Geomorphology 86(3-4):529-536. doi:10.1016/j.geomorph.2006.09.017
- Hanrahan TP. 2007. "Large-scale spatial variability of riverbed temperature gradients in Snake River fall Chinook salmon spawning areas." River Research and Applications 23(3):323-341.
2005
- Hanrahan TP, DR Geist, and EV Arntzen. 2005. "Habitat quality of historic Snake River fall Chinook salmon spawning locations and implications for incubation survival: part 1, substrate quality." River Research and Applications 21(5):455-467.
2004
- Hanrahan TP, DR Geist, EV Arntzen, and CS Abernethy. 2004. Effects of Hyporheic Exchange Flows on Egg Pocket Water Temperature in Snake River Fall Chinook Salmon Spawning Areas. PNNL-14850, Pacific Northwest National Laboratory, Richland, WA.
- Hanrahan TP, DD Dauble, and DR Geist. 2004. "An estimate of chinook salmon (Oncorhynchus tshawytscha) spawning habitat and redd capacity upstream of a migration barrier in the upper Columbia River." Canadian Journal of Fisheries and Aquatic Sciences 61(1):23-33.
2003
- Dauble DD, TP Hanrahan, DR Geist, and MJ Parsley. 2003. "Impacts of the Columbia River Hydroelectric System on Mainstem Habitats of Fall Chinook Salmon." North American Journal of Fisheries Management 23(3):641-659.
2002
- Geist DR, TP Hanrahan, EV Arntzen, GA McMichael, CJ Murray, and YJ Chien. 2002. "Physicochemical charateristics of the hyporheic zone affect redd site selection of chum salmon and fall chinook salmon in the Columbia River." North American Journal of Fisheries Management 22(4):1077-1085.