Aquatic Systems Branch scientists analyze rings of riparian trees relating tree growth and establishment to historical flow. We then use the tree rings to reconstruct the flow in past centuries. Flow reconstructions discover the frequency and magnitude of past droughts and floods—information that is essential for management of rivers and water supplies. We also use downscaled climate projections and watershed models to predict changes in flow and tree growth resulting from human-induced climate change. We have pioneered the use of cottonwood, a dominant riparian species, for tree ring analysis; this is a significant advance in arid regions where old trees of other species are scarce. Ongoing studies focus on rivers of the Upper Missouri Basin and the Tarim River in China.
Shapefiles and Historical Aerial Photographs, Little Missouri River, 1939-2003
This dataset includes aerial imagery of the Little Missouri River in the North Unit of Theodore Roosevelt National Park, ND from 1939 to 2005, as well as shape files delineating the channel in each image. These data were analyzed in:
Miller, J.R., and J.M. Friedman. 2009. Influence of flow variability on flood-plain formation and destruction, Little Missouri River, North Dakota. Geological Society of America Bulletin 121:752-759.
Below are other science projects associated with this project.
Riparian Ecology
Below are publications associated with this project.
Flow reconstructions in the Upper Missouri River Basin using riparian tree rings
Alternative standardization approaches to improving streamflow reconstructions with ring-width indices of riparian trees
Dendroclimatic potential of plains cottonwood (Populus deltoides subsp. monilifera) from the Northern Great Plains, USA
Tree-ring records of variation in flow and channel geometry
Influence of flow variability on floodplain formation and destruction, Little Missouri River, North Dakota
Responses of riparian cottonwoods to alluvial water table declines
Below are partners associated with this project.
- Overview
Aquatic Systems Branch scientists analyze rings of riparian trees relating tree growth and establishment to historical flow. We then use the tree rings to reconstruct the flow in past centuries. Flow reconstructions discover the frequency and magnitude of past droughts and floods—information that is essential for management of rivers and water supplies. We also use downscaled climate projections and watershed models to predict changes in flow and tree growth resulting from human-induced climate change. We have pioneered the use of cottonwood, a dominant riparian species, for tree ring analysis; this is a significant advance in arid regions where old trees of other species are scarce. Ongoing studies focus on rivers of the Upper Missouri Basin and the Tarim River in China.
Plains cottonwood (Populus deltoides subsp. monilifera). Cottonwood forests dominate river flood plains in dry regions of North America, Asia and Europe. Flood-plain cottonwoods are widely distributed and long-lived and have distinct annual rings highly correlated with river flow. Photo by USGS. Public domain. A plains cottonwood, the increment borer used to collect a core 1 cm in diameter, the core, and a paper straw used to transport the core. Photo by Derek Schook. Public domain. Photomicrograph of tree rings in a core from the flood plain of the Little Missouri River in Theodore Roosevelt National Park, North Dakota. Ring width of this cottonwood tree was reduced by drought in 1931, 1934, 1936 and 1937. Photo by Jesse Edmondson. Public domain. Reconstruction of log-transformed April-July Flow of the Little Missouri River near Watford City ND, gage 06337000, in the North Unit of Theodore Roosevelt National Park. This reconstruction is based on cores of plains cottonwood from the North Unit and from the lower Powder River near Moorhead, MT. Blue line is measured log of discharge, red line is reconstructed log of discharge, and black line is 15-yr smoothing spline. Spline is dashed where confidence in the reconstruction is low because of small sample size. Shaded area is the number of cores in each year. From Schook et al. 2016. Public domain. Shapefiles and Historical Aerial Photographs, Little Missouri River, 1939-2003
This dataset includes aerial imagery of the Little Missouri River in the North Unit of Theodore Roosevelt National Park, ND from 1939 to 2005, as well as shape files delineating the channel in each image. These data were analyzed in:
Miller, J.R., and J.M. Friedman. 2009. Influence of flow variability on flood-plain formation and destruction, Little Missouri River, North Dakota. Geological Society of America Bulletin 121:752-759.
- Science
Below are other science projects associated with this project.
Riparian Ecology
Riparian ecologists at the Fort Collins Science Center study interactions among flow, channel change, and vegetation along rivers across the western United States and worldwide. Our work focuses on issues relevant to the management of water and public lands, including dam operation, climate change, invasive species, and ecological restoration. Investigations take place on a range of scales. For... - Publications
Below are publications associated with this project.
Flow reconstructions in the Upper Missouri River Basin using riparian tree rings
River flow reconstructions are typically developed using tree rings from montane conifers that cannot reflect flow regulation or hydrologic inputs from the lower portions of a watershed. Incorporating lowland riparian trees may improve the accuracy of flow reconstructions when these trees are physically linked to the alluvial water table. We used riparian plains cottonwoods (Populus deltoides ssp.AuthorsDerek M. Schook, Jonathan M. Friedman, Sara L. RathburnAlternative standardization approaches to improving streamflow reconstructions with ring-width indices of riparian trees
Old, multi-aged populations of riparian trees provide an opportunity to improve reconstructions of streamflow. Here, ring widths of 394 plains cottonwood (Populus deltoids, ssp. monilifera) trees in the North Unit of Theodore Roosevelt National Park, North Dakota, are used to reconstruct streamflow along the Little Missouri River (LMR), North Dakota, US. Different versions of the cottonwood chronoAuthorsDavid M. Meko, Jonathan M. Friedman, Ramzi Touchan, Jesse R. Edmondson, Eleanor R. Griffin, Julian A. ScottDendroclimatic potential of plains cottonwood (Populus deltoides subsp. monilifera) from the Northern Great Plains, USA
A new 368-year tree-ring chronology (A.D. 1643–2010) has been developed in western North Dakota using plains cottonwood (Populus deltoides subsp. monilifera) growing on the relatively undisturbed floodplain of the Little Missouri River in the North Unit of Theodore Roosevelt National Park. We document many slow-growing living trees between 150–370 years old that contradict the common understandingAuthorsJesse Edmonson, Jonathan Friedman, David Meko, Ramzi Touchan, Julian Scott, Alan EdmonsonTree-ring records of variation in flow and channel geometry
We review the use of tree rings to date flood disturbance, channel change, and sediment deposition, with an emphasis on rivers in semi-arid landscapes in the western United States. As watershed area decreases and aridity increases, large floods have a more pronounced and sustained effect on channel width and location, resulting in forest area-age distributions that are farther from a steady-stateAuthorsM.F. Merigliano, J. M. Friedman, M. L. ScottInfluence of flow variability on floodplain formation and destruction, Little Missouri River, North Dakota
Resolving observations of channel change into separate planimetric measurements of floodplain formation and destruction reveals distinct relations between these processes and the flow regime. We analyzed a time sequence of eight bottomland images from 1939 to 2003 along the Little Missouri River, North Dakota, to relate geomorphic floodplain change to flow along this largely unregulated river. AtAuthorsJ.R. Miller, J. M. FriedmanResponses of riparian cottonwoods to alluvial water table declines
Human demands for surface and shallow alluvial groundwater have contributed to the loss, fragmentation, and simplification of riparian ecosystems. Populus species typically dominate riparian ecosystems throughout arid and semiarid regions of North American and efforts to minimize loss of riparian Populus requires an integrated understanding of the role of surface and groundwater dynamics in the esAuthorsM.L. Scott, P.B. Shafroth, G.T. Auble - Partners
Below are partners associated with this project.