River Regulation Effects on Floodplain Hydrology and Ecology

Klimas, Charles V.

doi:10.1007/978-1-4684-7392-6_4

Cited by 3 publications

(4 citation statements)

References 4 publications

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“…Consequently, there may also be a lack of physical changes such as those caused by siltation and erosion under normal flooding conditions (Klimas, 1988;Petts and Amoros, 1996;Poff et al, 1997;Keddy, 2000). Similar changes may also occur due to the construction of barrages (weirs), but their operation in diverting water greatly determines the frequency and magnitude of water level changes (e.g.…”

Section: Discussionmentioning

confidence: 97%

“…Usually, hydrological changes in upstream floodplain wetlands following the construction of dams and dykes for river regulation include a loss of normal flood cycle, a change from periodic high floods to a constantly lower water level, and uncertainty in the timing, duration and depth of flooding. Consequently, there may also be a lack of physical changes such as those caused by siltation and erosion under normal flooding conditions (Klimas, 1988;Petts and Amoros, 1996;Poff et al, 1997;Keddy, 2000). Similar changes may also occur due to the construction of barrages (weirs), but their operation in diverting water greatly determines the frequency and magnitude of water level changes (e.g.…”

Section: Discussionmentioning

confidence: 99%

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Vegetation structure and dynamics of a floodplain wetland along a subtropical regulated river

Chauhan

Gopal

2005

River Res. Applic.

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This paper documents vegetation changes in a floodplain area lying next to a newly constructed reservoir on the River Yamuna (near Delhi), about a kilometre downstream of an older, silted-up reservoir. The study site was a rectangular depression bounded by dykes on three sides and agricultural fields on the fourth. The composition and abundance of species in the plant community were observed over a ten year period (1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996) and changes in water level both at the study site and in the reservoir were followed. Site hydrology was governed by water level changes caused by reservoir operation with effect from 1990, when it was first filled to capacity and water began to seep through the dyke. The study area experienced increasing depth, duration and frequency of flooding. Species richness peaked in 1992, and the plant community developed four distinct zones closely associated with the hydrological gradient. Patchiness also increased though Typha angustata patches merged over time to form a continuous expanse. The microtopography of the study site, and hydrological and plant-induced changes were largely responsible for community changes. Dyke compaction over time resulted in cessation of seepage and the study site gradually dried up by 1998, with a consequent loss of plant species. The study concludes that the hydrological regime, rather than physical connectivity with the river, may play the dominant role in developing and maintaining plant community structure in floodplain wetlands.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Vegetation structure and dynamics of a floodplain wetland along a subtropical regulated river

Chauhan

Gopal

2005

River Res. Applic.

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“…Two key components determining species composition in floodplains and periodically flooded bottomland forests are hydrologic regime and light availability (Menges and Waller 1983;Klimas 1988;Gosselink and Lee 1989). Our study simulated changes in these variables that may occur naturally, or through management practices.…”

Section: Discussionmentioning

confidence: 99%

Growth and competitive abilities of the federally endangered Lindera melissifolia and the potentially invasive Brunnichia ovata in varying densities, hydrologic regimes, and light availabilities

Hawkins

Schiff

Wilson

et al. 2016

Botany

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Brunnichia ovata (Walter) Shinners is a native, perennial, woody vine with the potential to become an aggressive competitor of the federally endangered shrub Lindera melissifolia (Walt.) Blume. Our study simulated habitat disturbances to hydrologic regime and light availability that may occur naturally, or through active management practices aimed at ensuring the sustainability of L. melissifolia, and we determined the species responses to these changes. First-year plants of L. melissifolia and B. ovata were grown at varying densities, in flooding or nonflooding treatments, and receiving 100%, 47%, or 21% light availabilities. For both species, density effects, in combination with light availability and flooding regime influenced total biomass accumulation. Brunnichia ovata exhibited a high degree of plasticity with respect to biomass allocated between above- and below-ground tissues in response to flooding, whereas biomass allocation in L. melissifolia was relatively unaffected. Interspecific competition occurred primarily in nonflooding treatments. Our study highlighted the complexity of the relationship of L. melissifolia and B. ovata with regard to functional trait responses to changes in abiotic and biotic factors, and indicated that it will be necessary to consider entire plant community responses to mitigate increased competitive interactions and ensure the survival of L. melissifolia populations.

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“…Although precise quantitative data are limited, several thousand km of rivers and streams within the United States have been channelized and/or dammed (Benke 1990, National Research Council 1992. Several authors have noted that altered flood frequency, timing, and duration of flooding associated with dams and channelization projects can have significant impacts on BI~H plant and animal communities (Fredrickson 1979, Klimas et al 1981, Klimas 1988, Schneider et al 1989. Generally, dam operations result in reduced peak flows and decreased variability in timing and duration of floods below the dam (Schneider et al 1989).…”

Section: Implications For Management and Restorationmentioning

confidence: 98%

Plant succession and greentree reservoir management: implications for management and restoration of bottomland hardwood wetlands

King¹,

Allen²

1996

Wetlands

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Bottomland hardwood forests are distributed along rivers and streams throughout the central and eastern United States, with the greatest concentration in the Southeast. Past and projected losses of bottomland hardwoods and degradation of remaining stands suggest that habitat management and/or restoration strategies thut target multiple species and multiple uses will be necessary to maintain, enhance, and restore flora and fauna within bottomland hardwood wetlands. A greentree reservoir is a current management strategy that entails manipulating water regimes to provide habitat for wintering waterfowl. We conducted a literature review and synthesis to determine the potential impacts of greentree reservoir management on plant succession within bottomland hardwood wetlands. Greentree reservoirs can impact vegetation establishment through several processes. Despite shortcomings of greentree reservoirs, designs similar to them could be very beneficial in restoring bottomland hardwood plant and animal communities from degraded forests provided water-level control and maintenance are substantially improved. Emulation of natural hydrologic regimes, including natural variability, could produce diverse bottornland hardwood plant communities and provide habitat for a variety of w'ildlife species.

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River Regulation Effects on Floodplain Hydrology and Ecology

Cited by 3 publications

References 4 publications

Vegetation structure and dynamics of a floodplain wetland along a subtropical regulated river

Vegetation structure and dynamics of a floodplain wetland along a subtropical regulated river

Growth and competitive abilities of the federally endangered Lindera melissifolia and the potentially invasive Brunnichia ovata in varying densities, hydrologic regimes, and light availabilities

Plant succession and greentree reservoir management: implications for management and restoration of bottomland hardwood wetlands

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