Han River Ipo-Bo opened the door of the water, "Football field 12"

After the opening of the Han Ippo River, the egg that feeds in the Yangcheon. [사진 환경부]

Since the first opening on the Han River on the 4th of last month, sandbags have appeared and the waterbirds have multiplied by 15, confirming that the river has returned to its original shape.

The Ministry of the Environment announced on January 29 that the original rivers had been observed following the opening of the Ippo Boat system on the Han River system from October 4 to the last. day to the catchment level (EL.26.4 m).

Previously, the Ministry of Environment had opened the Ipo Boo, which offers good opening conditions between the three water courses of the Han River drainage system. At the time of the four major river projects, the Han River accounted for 47 million m3 (255㎞ of the construction section), the seventh of the Nakdong River (323 million m3 of dredging, 470 km of construction area). The Ministry of the Environment has focused on 14 areas such as water quality, landscape and ecosystems since the opening.

The appearance of the merged branch of Yangcheoncheon before the opening of the river. [사진 환경부]

After the opening of the Han River, the melting section of Yanghwa Creek. [사진 환경부]

According to the Ministry of the Environment, when the water level was lowered due to the opening of reservoirs, layers of sand, gravel and layers of sedimentary perl appeared in the Combined water courses of both rivers and Yangcheoncheon.

With this opening, new sandbags of about 12 times (0.086 km2) were created and the waterside space increased by 9.8%, or about 58 times ( 0,406㎢) of the football field.

After opening the lake, the ecological space increased and wetlands, puddles and shallow sections were formed, and many waterfowl were observed. The number of waterbirds that were only 26 species in September, before September, was multiplied by more than 15, with 404 species of 9 species.

Migratory birds such as drones, herons and herons, as well as backcrosses and freshwater cormorants, are thought to have migrated from neighboring areas due to improved habitat conditions around the area. # 39; Ippo.

A river crosses the Han Ippo-bao River in the city of Yeoju, which has opened its door. [사진 환경부]

The water flow was improved as the residence time decreased and the flow increased as the bearing surface opened.

The retention time after beam opening was 0.4 days, which decreased by 50% over the previous 0.8 days and the flow rate was 19 cm / s, an increase of 124% compared to 8.5 cm / s before opening.

However, the overall quality of water, such as green algae and total phosphorus, was similar to that of the same period of the previous year.

The Ministry of the Environment has carefully encouraged the opening of the ecosystem to minimize the impact of ecosystems.

A Ministry of Environment official said: "We lowered the water level to 1.6 cm per hour and stopped watering at night," he said. .

During the opening process, the Ministry of Environment saved 103,370 shellfish, including reeds, and became a source of deep water.

The Ministry of the Environment explained that the groundwater fluctuation was below the level of open water and that the water intake and pumping station were not problematic.

The details of Ippo's opening will be published in the comprehensive information monitoring system as of May 30th.

Chun Kwon-pil, journalist [email protected]