Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Upper Mississippi River Wing Dam Notching: The Pre-Notching Fish Study
Six wing dams and an adjacent side channel in Pool 13 of the Upper Mississippi River were studied in the initial phase (pre-notching) of a project to determine the effects of wing dam notching on fish and aquatic community characteristics. Fifty two species of fish were caught in the study area with hoop nets, electrofishing gear, and a small-mesh seine. Thirty eight fish species were caught on or near wing dams. Electrofishing provided the widest variety of fish species and hoop netting provided the least. Electrofishing and hoop net catches were influenced by river stage or discharge. Species composition of the catches changed more dramatically from sampling month to month than between kinds of habitat. Fish were caught in greatest numbers and diversity throughout the study area in August. Discharge varied from month to month and year to year. Water temperature and dissolved oxygen concentration were nearly uniform with depth and among sampling sites each month. Height of wing dams and their position with respect to an upstream bend in the river and to other wing dams influenced current velocity in the study area. Current sweeping over submerged wing dams and over emergent wing dams during high river stages helps prevent sediment accretion between them.
Upper Mississippi River Wing Dam Notching: The Pre-Notching Fish Study
Six wing dams and an adjacent side channel in Pool 13 of the Upper Mississippi River were studied in the initial phase (pre-notching) of a project to determine the effects of wing dam notching on fish and aquatic community characteristics. Fifty two species of fish were caught in the study area with hoop nets, electrofishing gear, and a small-mesh seine. Thirty eight fish species were caught on or near wing dams. Electrofishing provided the widest variety of fish species and hoop netting provided the least. Electrofishing and hoop net catches were influenced by river stage or discharge. Species composition of the catches changed more dramatically from sampling month to month than between kinds of habitat. Fish were caught in greatest numbers and diversity throughout the study area in August. Discharge varied from month to month and year to year. Water temperature and dissolved oxygen concentration were nearly uniform with depth and among sampling sites each month. Height of wing dams and their position with respect to an upstream bend in the river and to other wing dams influenced current velocity in the study area. Current sweeping over submerged wing dams and over emergent wing dams during high river stages helps prevent sediment accretion between them.
Upper Mississippi River Wing Dam Notching: The Pre-Notching Fish Study
R. B. Pierce (Autor:in)
1980
285 pages
Report
Keine Angabe
Englisch
Water Pollution & Control , Ecology , Fishes , Mississippi River , Iowa , Illinois , Distribution , Sampling , Dams , Channels , Cutting , Theses , Wing dams , Notches