"At daybreak, the Danxia River flows down and shines on the head of the city" is a literary phrase describing the beautiful scene of the sun shining on the head of the city at sunrise. Among them, "Daybreak" indicates the time of sunrise, "Danxia 流宕" describes that the sunlight is like flowing red clouds, and "Shining on the City Head" describes the scene of the sunlight shining on the city head, and "The sunlight shines on the city head" describes that the sunlight shines on the city head. The word "sunlight" describes the splendor and quantity of the sunlight.
The meaning of the whole sentence is that whenever the sun rises, there will always be streams of red sunlight floating and shining on the city, forming a magnificent scene of ten thousand channels of sunlight.