Can we restore badly degraded urban lakes?

被引:47
|
作者
Dunalska, Julita A. [1 ]
Grochowska, Jolanta [1 ]
Wisniewski, Grzegorz [1 ]
Napiorkowska-Krzebietke, Agnieszka [2 ]
机构
[1] Univ Warmia & Mazury, Dept Water Protect Engn, PL-10719 Olsztyn, Poland
[2] Inland Fisheries Inst, PL-10719 Olsztyn, Poland
关键词
Water quality; Trophic State Index; Urban lakes; Lake protection; Lake restoration; TROPHIC STATE INDEX; HYPOLIMNETIC WITHDRAWAL; WATER; PHOSPHORUS; BIOMANIPULATION; EUTROPHICATION; INDICATORS; ECOSYSTEM; CARBON;
D O I
10.1016/j.ecoleng.2015.05.037
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
We investigated the effect of long-term inflow of untreated municipal sewage on the trophic status of the four urban lakes (Mielenko, Karczemne, Klasztorne Male, Klasztorne Duze) connected by the river into one system. We delineated the catchments and sub-catchments of the individual lakes, to determine their hydrological parameters as well as the physicochemical properties of water in the lakes, their surface inflow and outflow as well as water discharged to lakes from stormwater and drainage ditches. Results of the TSI demonstrated that Karczemne Lake and Klasztorne Male Lake were the most polluted of the analyzed lakes. The value of TSITP was extremely high: 103 and 85, respectively. The biggest hazard for the quality of waters in the lakes was: angling in Mielenko Lake (44.8%); point sources (42.1%) and the inflow from Mielenko Lake (33.5%) to Karczemne Lake; the inflow from Karczemne Lake (60.4%) and point sources (35.9%) for Klasztorne Male Lake; and the inflow from Klasztorne Male Lake (95.2%) to Klasztorne Duze Lake. According to Vollenweider's hydraulic model, the actual phosphorus load introduced to Mielenko Lake is double the critical load (7.8 kg y(-1)); in Karczemne and Klasztorne Male Lakes, the critical load is exceeded by 700% (12.1 kg y(-1) and 37.8 kg y(-1), respectively) and in Klasztorne Duze Lake, the actual load is 1000% higher than the critical one (the critical load-96.0 kg y(-1)). With such high phosphorus concentrations, natural inhibition of the lake's severe degradation is impossible. To achieve permanent water quality improvement we recommend the comprehensive protective and restoration actions: constructing pipelines and perimeter drainage ditches with waterproof walls sealed with PVC vinyl sheet piling along the entire lake system; removal of the bottom sediments from Karczemne Lake and some of the bottom sediments from Klasztorne Male Lake; phosphorus inactivation in the lakes Mielenko, Karczemne and Klasztorne Male, along with supportive actions in the form of biomanipulation. (C)2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:432 / 441
页数:10
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