Spatial and temporal variability of turbidity, dissolved oxygen, conductivity, temperature, and fluorescence in the lower Mekong River–Tonle Sap system identified using continuous monitoring

Continuous monitoring of turbidity, dissolved oxygen (DO), conductivity, temperature, and fluorescence was done at five locations on the Tonle Sap Lake and the Mekong–Bassac Rivers near Phnom Penh, Cambodia, between 2004 and 2010 using autonomous datasondes. Seasonal, daily, and spatial trends were...

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Bibliographic Details
Published in:International journal of river basin management 2011-06, Vol.9 (2), p.151-168
Main Authors: Irvine, K. N, Richey, J. E, Holtgrieve, G. W, Sarkkula, J, Sampson, M
Format: Article
Language:English
Subjects:
ARIMA models
Conductivity
continuous monitoring
Dissolution
dissolved oxygen
flood pulse system
fluid mechanics
Fluorescence
forests
Freshwater
Lakes
Mathematical models
Mekong-Bassac Rivers
metabolism
Monitoring
monsoon season
Rivers
Seasons
sediments
Temperature
temporal variation
Tonle Sap
total suspended solids
Turbidity
water quality
wet season
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Summary:Continuous monitoring of turbidity, dissolved oxygen (DO), conductivity, temperature, and fluorescence was done at five locations on the Tonle Sap Lake and the Mekong–Bassac Rivers near Phnom Penh, Cambodia, between 2004 and 2010 using autonomous datasondes. Seasonal, daily, and spatial trends were clearly identified in the data and were related to the annual monsoon rainy season–dry season cycle, system metabolism, system hydraulics, and in some cases, localized phenomena such as waste discharges. The datasondes were particularly useful to track the oxygenation of anoxic black water areas in the flooded forest fringe of the Tonle Sap that occurred during the rainy season freshwater pulse. A strongly developed vertical variation of turbidity, DO, and conductivity in the flooded forest fringe may be related to a combination of factors, including dissolved material release from bed sediment and a floating organic-rich particulate layer near the bottom of the lake. Grab samples for total suspended solids (TSS) were collected at the Preak Leap (PL) site (Mekong River) in 2009 and 2010. An excellent relationship was established between daily mean turbidity and TSS concentration for the PL site, with r² = 0.95. Autoregressive, integrated, moving average models adequately forecast water level and water quality data one month ahead.
ISSN:1814-2060
1571-5124
1814-2060
DOI:10.1080/15715124.2011.621430