Characterization of the reservoir ecosystem

Modifications of nutrient regime, chlorophyll-a, and trophic state relations in Daechung Reservoir after the construction of an upper dam

“…This reservoir is a large branch-type lake with a 72-m-high dam and a gross storage capacity of 1490 Mm 3 (Oh et al 2001). Previous studies of reservoirs (artificial lakes; Kimmel and Groeger 1984;Kennedy et al 1985;Cole and Hannan 1990) pointed out that spatial heterogeneities in physical structure, chemical water quality, and biological components are large and temporal variations are large due to large fluctuations of rainfall and/ or runoff from the watershed. Such heterogeneity is mainly attributed to greater flushing rate than natural lakes (Canfield and Bachmann 1981;Straskraba 1996).…”

“…Reservoir ecosystems typically have prominent longitudinal heterogeneities in water quality from the headwaters to the dam (Kennedy et al 1982(Kennedy et al , 1985Kimmel et al 1990). Spatial and temporal variabilities of nutrients, trophic state, and algal productions are large in reservoir ecosystems, and the variabilities are especially greater in monsoon regions (Asia) than non-monsoon regions (Park et al 2010).…”

Greenhouse Gas Emissions from Hydroelectric Reservoirs: What Knowledge Do We Have and What is Lacking?

“…Compared to natural lakes, reservoirs tend to have shorter water residence times and more complex heterogeneity due to the presence of one or more major water inlets, instead of multiple diffuse water sources characteristic for most natural lakes (Kennedy et al, 1985;Kennedy & Walker, 1990). Reservoirs are intrinsically linked to the rivers that feed them (Baxter, 1977), creating a river-reservoir continuum, in which water and sediment inputs are functions of the land use in the watershed (Kelly, 2001).…”

Predicting the summer chlorophylla concentration in a reservoir based on the environmental conditions of the preceding spring

“…The water depth of this density current can be approximated as the depth with the nearest temperature to the inflowing river water (Fig. 3), although other factors, such as the outflow magnitude and location at the dam might influence current depth (Kennedy et al, 1985). Figure 3 shows that the inflowing river water flowed at the lake surface in April and downward into the metalimnion throughout the summer of 1984.…”