Now that sand is so expensive, why not use the sand contained in the Yellow River water?

The sand in the Yellow River can be used, but there are very few sand and gravel resources in the Yellow River that can be used. Although the Yellow River is mainly caused by the fact that most of the coarse sand cannot be washed away and accumulates in the "river channel", causing the Yellow River to become an above-ground "suspended river", it should be noted that the so-called coarse sand in the Yellow River refers to particles larger than 0.05 mm, and sand used for construction The 4.75mm grain size is very different and too fine. Therefore, a lot of Yellow River sand is not suitable for construction sand. The picture below shows various construction sand and gravels that meet the requirements.

Due to a large amount of silt deposited in the lower reaches of the Yellow River, the river shrank and became an above-ground hanging river. The ability to pass water was reduced and it was prone to small floods and major disasters. The strategy to control the Yellow River was to widen the river and consolidate embankments. The so-called "reinforcement of embankments" means to continuously heighten and strengthen the embankments to improve flood control capabilities. The Yellow River Water Conservancy Commission has raised and thickened the Yellow River embankment three times. Most of the reinforcement materials were directly mined from the Yellow River. The total sand mining volume is about 400 million cubic meters.

In addition to public welfare sand mining, the Yellow River Commission also plans for-profit sand mining, which is the mining of sand used for construction. The scope of sand mining includes the main stream of the Yellow River, 12 tributaries of the Yellow River, and the old lake area of ??Dongping Lake. The total annual controlled sand mining volume is 68.24 million tons, of which 27.11 million tons are in the section above Yumenkou of the main stream of the Yellow River, accounting for 10% of the total controlled volume in the basin. 39.7; tributaries accounted for 56.5 of the total; Dongping Lake Old Lake District accounted for 3.8 of the total.

However, there are still over-exploitation, indiscriminate mining and illegal mining in the mining of Yellow River sand, which affects flood control safety. For example, in 2012, the sand mining volume above Tongguan in the middle reaches of the Yellow River reached 193 to 295 million tons. Therefore, it is not that the sand in the Yellow River is not allowed to be mined, but it is a question of how to mine it in an orderly and planned manner, taking into account the safety of the river.