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Chlorophyll a. For example, in light winds during the period of thermocline formation resulted in a thicker hypolimnion in the central basin.
Pre- cipitation also plays a role in nutrient concentrations; high rainfall in the early 's over the upper Great Lakes basins resulted in record-high flow rates in the Detroit River in and Of all pge Great Lakes, Lake Erie has been stressed to the furthest extent as a result of man's activities. Zapotosky 5. This report was submitted in fulfillment of Grant No.
Feder and John E. Herdendorf 1 2.
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R Project Officer Nelson A. Also, because of high concentrations of nutrients in the lake, particularly the western basin, the limiting factor in algal production appears to be sunlight.
Environmental Protection Agency, and approved for publication. Up to 10 percent of the phosphorus delivered to the lake can be regenerated under anoxic conditions. The assess- ment was accomplished by visiting approximately 50 stations at nearly monthly intervals during the ice-free periods.
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This report provides an insight into the processes that go on within Lake Erie and our attempt to describe them. Pliodzinskas and E.
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This document is available to the public through the National Technical Informa- tion Service, Springfield. Herbert A. This increased reservoir of oxygen reduced the area of anoxia by over 95 percent and thereby decreased the amount of regenerated phosphorus from the sediments by over 70 percent from the two years. However, physical regeneration due to storm resuspension of sediment 147 have a larger impact peersonals internal nutrient loading, par- ticularly during non-stratified periods.
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Zapotosky vii FIGURES 1 Monitoring stations location map for the central and western basins of Lake Erie 4 2 Schematic representation of sampling depths in Lake Erie 12 3 Water quality grids used for area- and volume- weighted calculations in the central and western basins of Lake Erie , 14 4 Trends in anoxic hypolimnion of Lake Erie 16 5 Relationship between dissolved oxygen concentrations in the lower hypolimnion of central Lake Erie and soluble reactive phosphorus regeneration, cruises 7 and 8, August September pfrsonals, Over 25 water quality, meteorological and biological parameters were routinely determined shipboard or on samples collected at a typical station.
Britt, A. Therefore, during this period the con- centrations and quantities of nutrients within the waters of the lake have remained relatively stable. Measurements were taken pafe several depths in order to characterize the various strata of water in the lake and perosnals permit volume-weighted calculation of nutrient concentrations and quantities.
The concentration of nutrients, although not the quantity, was lowest dur- ing this period from dilution by excessive precipitation. Modifi- cations in agricultural practices will reduce wrie loading of nutrients to the tributaries, but these changes will not be reflected in water quality improvements for several years due to the slow migration of sediment to the lake.
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It is important that this start at improving the conditions of Lake Erie be continued and that new methods pagd lake restoration be explored. Approval does not ify that the contents necessarily reflect the views and policies of the U.
Although the effectiveness of nutrient controls in reversing eutrophication in Lake Erie cannot be demonstrated, the halting of further degradation is an important first step. An encouraging of nutrient control is that although no decreases have been observed, the constant persobals which have taken place in preceeding decades have been stopped.
The pesronals quantity Is delivered by the Detroit River, but the highest concentrations were observed near the mouth of the Maumee River. As we better describe the processes that go on within the Great Lakes, we will be in a better position to understand and predict the management of Great Lakes systems.
;age Protection Agency, nor does mention of trade names or commercial products con- stitute endorsement or recommendation for use. Also, many new treatment facilities are just now being placed in operation. Most of the nutrient loading to Lake Erie occurs in the western basin. Sheffield and Walter E.
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Jaworski, Ph. Larson and David E. Rathke 8.
Environmental Protection Agency, have been grouped into nine series These nine broad cate- gories were established to facilitate further development and application of en- vironrnentai technology Elimination of traditional grouping was consciously planned to tostei technology transfer and a maximum' interface in related fields. This report covers a period from June 15, to June 14, and work was completed as of April 27, Fay and David E. Wise 6. Environmental Protection Agency.
Taft 64 3. The western and central basins are effective sinks for nutrient loading; approximately 82 percent of the phosphorus carried to the lake by the tributaries remains in bottom sediments. The objective of the study was to determine recent trends in lake eutrophication and water quality which may be related to recent attempts to control nutrient loadings to these basins. This work provides the technical basis for setting standards to minimize undesirable changes in living organisms in the aquatic, terrestrial, and atmospheric environments.