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Water quality characteristics and pollution load estimation of main rivers around Erhai Lake
Vol 3, Issue 1, 2022
VIEWS - 81 (Abstract)
Abstract
In order to reveal the pollution characteristics of the main rivers entering Erhai Lake, from January 2014 to December 2016, taking total nitrogen (TN), total phosphorus (TP), ammonia nitrogen (NH3-N) and chemical oxygen demand (CODcr) as pollutant indicators, the water quality and quantity of 27 main rivers entering Erhai Lake were monitored and investigated along the way At the same time, combined with the analysis of the precipitation data in the same period and the water quality monitoring data of the lake area, this paper expounds the water quantity and water quality characteristics of the main rivers entering the lake, estimates the pollution load entering the lake, and evaluates the impact of the pollution load entering the Lake on the water quality of the lake area The results show that: a. from 2014 to 2016, the total water inflow of 27 main rivers into the lake was 287 million~474 million m3, and the water inflow in flood season accounted for 79.17%, 74.90% and 61.96% of the annual water inflow respectively. The water inflow into the lake was positively correlated with the precipitation of the basin; b. On the time scale, the pollutant concentration shows a fluctuating trend of first increasing and then decreasing in the whole year. The water quality in rainy season is generally good, the spatial difference of pollutant concentration is not as obvious as that on the time scale, and the pollutant concentration has a significant negative correlation with the rainfall of the basin; c.
The pollution load of Erhai Lake decreases first, then increases and then decreases in the year. The load of Erhai Lake is mainly controlled by the amount of water. The contribution rate of pollution load is in the order of north bank>West Bank>southeast bank. The total nitrogen input of rivers entering the lake is positively correlated with the total nitrogen concentration in the lake area, and the total phosphorus input is positively correlated with the total phosphorus concentration in the lake area. It is an important source of nitrogen and phosphorus in Erhai Lake
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Prof. Jesus Simal Gandara
Food Science, the University of Vigo, Spain
