Recognize the resolution of human-induced disturbance amongst the natural variability of river behavior.
Goal is to expand on this from a regional perspectiveNot just classify, but understand the conditions that dictate disturbance formation and evolutionMuch research done on meander migration – flume experiments, great if working in an unbound, homogenous environment….not ozarks
During the development of the watershed management plan…….This is possibly a result of the watersheds history……And it could also be a result of the rapid urbanization in the watershed as it contains…….And also noteworthy is that Finley Creek is one of the…….
VERY LITTLE CHANGE BETWEEN 1955 AND 2006…..but we can see that sinuosity is the highest in the middle section…..so although one type of disturbance dominates, the degree of disturbance balances out the sinuosity, so let’s look at the degree of change…….
We found no such relationship in this Ozarks Stream
AAG 2009 - Talk
Analysis and Classification of Channel Disturbance Zones in an Ozark River<br />Derek Martin – Research Specialist<br />Ozarks Environmental and Water Resources Institute (OEWRI)<br />Missouri State University<br />Springfield, Missouri<br />
Channel “Disturbance”<br />“An area where excessive erosion or deposition has taken place, often resulting in extreme changes in channel pattern.”<br /> -Robert Jacobson (USGS)<br />
Importance of identifying and understanding channel disturbance<br />Biological<br />Physical<br />Engineering = Predictive capabilities<br />Channel “Disturbance”<br />
Characteristics of Ozarks River Channels<br />Bedrock bed control<br />High width/depth ratios<br />Induces lateral channel movement where allowed<br />Lateral controls<br />Valley width<br />Bluffs<br />Riparian Veg?<br />Sediment Inputs<br />Cherty gravel<br />Landuse induced?<br />Combine to form unique channel patterns in the Ozarks…….<br />
Disturbance Area Analysis – Finley River<br />Why Finley River?<br /><ul><li>Stakeholders and managers have identified channel instability and sedimentation as one of the primary problems affecting their watershed
Contains one of the fastest growing counties in Missouri
One of the largest tributaries to the James River, which is on Missouri’s 303(d) list for nutrient impairment……Phosphorus laden sediments</li></li></ul><li>Research Objectives/Questions<br /><ul><li>Determine locations and extent of recent/historical channel change (disturbance zones)
Results - Meander Migration Rates<br />Hooke (1980) obtained a regression equation between migration rate of meander loops and upstream drainage area<br />No such relationship was discovered for Finley Creek…..almost the opposite.<br />
Conclusions<br />Disturbance areas form in areas of high confinement ratios compared to stable areas<br />Riparian vegetation plays no role in disturbance area formation<br />Four distinct disturbance area patterns can be identified on the Finley River<br />Extension<br />Translation<br />Chute Cut-off<br />Megabar formation<br />Contributing drainage area plays no role in development of specific disturbance types<br />Meander migration in the Finley River does not follow typical migration trends<br />Disturbance types increase or decrease in intensity to maintain a sinuous equilibrium<br />
Final Remarks<br />Make accurate predictions of future river behavior<br />“…a need for predictive capability with respect to river planform change.” (Gilvear et al., 2000)<br />“A knowledge of rates and patterns of planform change is also important in understanding habitat diversity in floodplain environments” (Gilvear et al., 2000)<br />Application of GIS in hydrology and watershed science<br />
Thank You!<br /> Questions?<br />Contact:<br />Derek J. Martin, Research Specialist<br />Ozarks Environmental and Water Resources Institute<br />Missouri State University<br />Email: email@example.com<br />