Abstract
The Middle Route of the South-to-North Water Diversion Project (MRP) is an important water supply for 20 large cities and 100 counties in Northern China. However, since 2016, the growth of large filamentous algae clusters has threatened the safety of the main canal water supply and water quality. In this study, a field investigation, monitoring, and hydrodynamic simulation were performed to analyze the hydrodynamic habitat conditions in areas with vigorous algae growth and establish a relationship between the hydrodynamic habitat conditions of the main canal and the growth, distribution, and correlation of macrobenthic algae in the main canal. The results showed that: (1) algae zones in the main canal are more likely to appear along curves, and the largest algal zone was at the front of the large curved section; (2) the length of the algae growth zone is related to the flow rate; and (3) a lower flow velocity in the main canal facilitates faster growth of an algae zone. This study provides specific and effective suggestions for the key prevention and control positions, which has important guidance on improving the efficiency of algae control in the main canal.
Highlights
The Middle Route of the South-to-North Water Diversion Project (MRP) was completed in 2014 and diverts water from the Danjiangkou Reservoir in the Hanjiang River Basin to 20 large cities and 100 counties in Henan and Hebei Provinces and Beijing and Tianjin Municipalities [1]
Since 2016, rapid algae growth has occurred in areas of the main canal of MRP in the spring and autumn, and the large number of filamentous algae clusters in the main canal has caused problems such as blockages of the watershed grilles and rapid siltation before the exit sluice; this has threatened the safety of the water supply and influenced the grade of water quality
The environmental fluid dynamic code (EFDC) model recommended by the United States
Summary
The Middle Route of the South-to-North Water Diversion Project (MRP) was completed in 2014 and diverts water from the Danjiangkou Reservoir in the Hanjiang River Basin to 20 large cities and 100 counties in Henan and Hebei Provinces and Beijing and Tianjin Municipalities [1]. Investigations of algae growth areas are urgently needed to determine the source of the algae and analyze the key factors that affect algae growth in the main canal in order to develop scientific and effective strategies for dealing with abnormal algae proliferation. Increased the hydrodynamic influence factor and obtained a linear relationship between the influence of the hydrodynamic conditions and the algae growth rate in the tributaries of the Three Gorges Reservoir area by applying a numerical fitting analysis. It is important to investigate those areas with vigorous algae growth and determine the source of algae in order to analyze the key factors that affect algae growth, while addressing the lack of algae monitoring in the main canal as well as the need for related research. The conditions in the main canal and the growth, distribution, and correlation of macrobenthic algae in the main canal were established to support the prevention and control of abnormal algae proliferation in the main canal
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