都江堰的主要结构是由3个人工堤坝和一个缓冲区构成的河流分割系统，该系统

The main structure of Dujiangyan is a river segmentation system composed of three artificial dams and a buffer zone. This system divides the Minjiang River three times. As shown in the figure, the first segmentation is located at Yuzui, dividing the river into external and internal. The location and construction of the dam conforms to the principle of concave bank erosion and convex bank accumulation in hydrology, and the difference in flow velocity between the inner river and the outer river is taken into account. It will lead to sedimentation of the Neijiang River, so the river bed of the Neijiang River will be deepened to prevent the sedimentation of the river bed and ensure the stability of the water. The second division is located in Feishayan, from Neijiang to the second division. As the river is narrow and the flow rate slows down, sediment will be deposited here to form a buffer zone. As a result, the river bed rises in the buffer zone, which prevents the river from flowing into the outer river during the dry season, and during the flood period, the rise in the water level will take away the sediment in the buffer zone and deepen the river bed to accelerate drainage. The lower third division is located at the mouth of the Aquarius, where it took eight years to manually excavate the rock to form a relatively solid waterway. Due to the first two divisions, the amount of water entering the mouth of the Aquarius will remain relatively stable, thereby achieving sufficient throughout the year. Irrigation and domestic water.

The main structure of Dujiangyan is a river segmentation system consisting of three artificial dams and a buffer zone, which divides the Weijiang River three times. As shown in the figure, the first division is located in the mouth of the fish, the river is divided into external and internal, the location and creation of the dam in line with the principle of concave erosion in the hydrology, convex bank accumulation, while taking into account the flow rate difference between the inner and outer rivers will lead to sedimentation of the inner river, thus deepening the riverbed of the inner river, to prevent siltriver accumulation to ensure water stability. The second segment is located in Feishayan, from the inner river in the secondary division, because the river is narrow, the flow rate slows down, the sediment will be deposited here, forming a buffer zone. As a result, the riverbed rises in the buffer zone, which prevents the flow of water into the outer rivers during the dry season, while rising water levels in floods take away the sediment from the buffer zone, and the riverbed deepens and accelerates drainage. The low three segments are located at the mouth of the bottle, which takes eight years to manually cut the rock to form a more robust waterway, and due to the first two segments, the amount of water entering the bottle mouth will remain relatively stable, thus achieving adequate irrigation and domestic water throughout the year.

The main structure of Dujiangyan is a river segmentation system composed of three artificial dikes and a buffer zone, which divides Minjiang River three times. As shown in the figure, the first division is located at Yuzui, which divides the river into external and internal parts. The site selection and construction of the dam conform to the principle of concave bank erosion and convex bank accumulation in hydrology. Meanwhile, considering that the velocity difference between the inner river and the outer river will lead to sediment deposition in the inner river, the riverbed of the Neijiang River will be deepened to prevent sedimentation and ensure the stability of water volume. The second division is located in feishayan, and the second segmentation is from Neijiang River. Due to the narrow channel and slow flow velocity, the sediment will deposit here and form a buffer zone. Therefore, the riverbed rises in the buffer zone, which will prevent the river from flowing into the outer river in the dry season, while in the flood period, the rising water level will take away the sediment in the buffer zone, deepen the riverbed and accelerate the drainage. The lower third division is located at the baopingkou, where it takes eight years to excavate the rock manually to form a relatively solid waterway. Due to the previous two divisions, the water entering the baopingkou will remain relatively stable, thus achieving sufficient irrigation and domestic water throughout the year.<br>