Analysis of Long-Term Trends in Lake Water Quality Observations

2012 ◽  
Vol 12 (1) ◽  
pp. 231-238 ◽  
Author(s):  
Eung Seok Kim ◽  
Jo Hee Yoon ◽  
Jae Woon Lee ◽  
Hyun Il Choi
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Lake Water Quality ◽  
Long Term Trends

scholarly journals Retention and Internal Loading of Phosphorus in Shallow, Eutrophic Lakes

2001 ◽  
Vol 1 ◽  
pp. 427-442 ◽  
Author(s):  
Martin Sondergaard ◽  
Peder Jens Jensen ◽  
Erik Jeppesen
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Recovery Period ◽  
Internal Loading ◽  
External Loading ◽  
Lake Water Quality ◽  
Eutrophic Lakes ◽  
P Release ◽  
P Accumulation

This paper gives a general overview of the nature and important mechanisms behind internal loading of phosphorus (P), which is a phenomenon appearing frequently in shallow, eutrophic lakes upon a reduction of the external loading. Lake water quality is therefore not improved as expected. In particular summer concentrations rise and P retention may be negative during most of the summer. The P release originates from a pool accumulated in the sediment when the external loading was high. In most lake sediments, P bound to redox-sensitive iron compounds or P fixed in more or less labile organic forms constitute major fractions forms that are potentially mobile and eventually may be released to the lake water. The duration of the recovery period following P loading reduction depends on the loading history, but it may last for decades in lakes with a high sediment P accumulation. During the phase of recovery, both the duration and net P release rates from the sediment seem to decline progressively. Internal P loading is highly influenced by the biological structure as illustrated by lakes shifting from the turbid to the clearwater state as a result of, for example, biomanipulation. In these lakes P concentrations may be reduced to 50% of the pre-biomanipulation level and the period with negative retention during summer can thus be reduced considerably. The duration of internal loading can be reduced significantly by different restoration methods such as dredging to remove accumulated P or addition of iron or alum to elevate the sorption capacity of sediments. However, an important prerequisite for achieving long-term benefits to water quality is a sufficient reduction of the external P loading.

Long-term changes in lake sediments and their infl uences on lake water quality in Japanese shallow lakes

2010 ◽  
Vol 177 (3) ◽  
pp. 177-188 ◽  
Author(s):  
Takehiko Fukushima ◽  
Koichi Kamiya ◽  
Yuichi Onda ◽  
Akio Imai ◽  
Kazuo Matsushige
Keyword(s):  
Water Quality ◽  
Lake Sediments ◽  
Shallow Lakes ◽  
Lake Water ◽  
Lake Water Quality ◽  
Long Term Changes

Long-term lake water quality predictors

1996 ◽  
Vol 30 (12) ◽  
pp. 2835-2852 ◽  
Author(s):  
Midhat Hondzo ◽  
Heinz G. Stefan
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Lake Water Quality

A modeling approach to forecast the effect of long-term climate change on lake water quality

2007 ◽  
Vol 209 (2-4) ◽  
pp. 351-366 ◽  
Author(s):  
Eiji Komatsu ◽  
Takehiko Fukushima ◽  
Hideo Harasawa
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Lake Water ◽  
Lake Water Quality ◽  
Modeling Approach

Improvement of Lake Water Quality by using Moving Rapid Water Treatment System

2018 ◽  
Vol 18 (1) ◽  
pp. 107-115 ◽  
Author(s):  
Kwang-Hee Lee ◽  
◽  
Min-Ho Kim ◽  
Nam-Woo An ◽  
Chul-hwi Park
Keyword(s):  
Water Quality ◽  
Water Treatment ◽  
Lake Water ◽  
Treatment System ◽  
Lake Water Quality ◽  
Water Treatment System

An Assessment of Lake Water Quality Index of Manipu Lake of District Ahmedabad, Gujarat

2012 ◽  
Vol 3 (4) ◽  
pp. 448-450 ◽  
Author(s):  
Nikesh G Kotadiya ◽  
◽  
C. A. Acharya C. A. Acharya
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Water Quality Index ◽  
Quality Index ◽  
Lake Water Quality

A modeling approach to simulate impact of climate change in lake water quality: phytoplankton growth rate assessment

1998 ◽  
Vol 37 (2) ◽  
pp. 177-185 ◽  
Author(s):  
Hany Hassan ◽  
Keisuke Hanaki ◽  
Tomonori Matsuo
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Growth Rate ◽  
Dissolved Oxygen ◽  
Lake Water ◽  
Phytoplankton Growth ◽  
Quality Data ◽  
Model Parameters ◽  
Lake Water Quality ◽  
Phytoplankton Growth Rate

Global climate change induced by increased concentrations of greenhouse gases (especially CO2) is expected to include changes in precipitation, wind speed, incoming solar radiation, and air temperature. These major climate variables directly influence water quality in lakes by altering changes in flow and water temperature balance. High concentration of nutrient enrichment and expected variability of climate can lead to periodic phytoplankton blooms and an alteration of the neutral trophic balance. As a result, dissolved oxygen levels, with low concentrations, can fluctuate widely and algal productivity may reach critical levels. In this work, we will present: 1) recent results of GCMs climate scenarios downscaling project that was held at the University of Derby, UK.; 2) current/future comparative results of a new mathematical lake eutrophication model (LEM) in which output of phytoplankton growth rate and dissolved oxygen will be presented for Suwa lake in Japan as a case study. The model parameters were calibrated for the period of 1973–1983 and validated for the period of 1983–1993. Meterologic, hydrologic, and lake water quality data of 1990 were selected for the assessment analysis. Statistical relationships between seven daily meteorological time series and three airflow indices were used as a means for downscaling daily outputs of Hadley Centre Climate Model (HadCM2SUL) to the station sub-grid scale.

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