Study And Analysis On Optimal Allocation Of Sediments In The Irrigation District Of Yellow River Delta

The sediment disposal had always been a difficult problem accompanied with the whole operation process in irrigation district in Yellow River Delta. Several different methods, including sediment utilization, disposal and transporting the sediments to farmland were used to solve this problem. But the quantity of treated sediments was so limited to solve the problem.Aimed at the present problem of the sediment disposal in the irrigation district, optimal disposal of sediment resources were studied in Xiaokaihe Irrigation District based on the study of sustainable utilization of soil resource in Yellow River Delta. The effects of muddy irrigation and water irrigation on soil physiochemical properties such as soil organic matter, nutrients, soil particle composition and structural performance were investigated in Xiaokaihe Irrigation District with different time and space scales and different land use type. The results showed that the sediments transported from Yellow River Delta to farmland in Xiaokaihe Irrigation District wouldn’t cause soil desertification.Meanwhile, the optimal allocation pattern of the sediments in the typical irrigation district in Yellow River Delta was proposed as utilization of sediment resource combined with amendment of soil construction and improvement of soil ecological environment according to the distribution of sediments in the irrigation area, the basic properties of soil and the ecological environment of the irrigation area. The mechanism of optimum disposal of sediments in the irrigation district in Yellow River Delta was established based on the mutual adaptability of the soil, the sediment and the environment. The focus of sediment disposal turned from passive distribution of the sediments to active utilization of the sediments using the pattern proposed above, which could utilize the sediments, amend the soil construction, improve the ecological environment of the irrigation district at the same time and supply a reference for further research in irrigation district in Yellow River Delta.