Author(s): Ting Wang; Yu Liu; Xinmin Xie; Wenrui Wang
Linked Author(s): TING WANG
Keywords: Brackish water Safety threshold Optimal allocation SWAP-WOFOST model Irrigation-yield response simulation
Abstract: In order to safely and maximize the use of brackish water and solve the problem of shortage of conventional fresh water in some areas, a brackish water irrigation-yield response model for crops based on SWAP-WOFOST model was constructed to analyze and determine the salinity threshold by simulating various brackish water irrigation schemes, combining with the differentiated salt tolerance characteristics of crops at different growth stages. On this basis, the optimal allocation model of brackish water resources was constructed with brackish water recoverable amount as the boundary condition, and a case study was carried out in Guantao County, Hebei Province. The results show that: The brackish water salinity thresholds of winter wheat, a typical crop in Guantao County, were 3g/L, 3g/L and 4g/L, respectively at greening stage, jointing stage and heading stage. Under the moderate social and economic development level, the appropriate brackish water supply of Guantao County in 2030 and 2035 is 12.6 million m3 and 13 million m3 respectively, which increases by 80% and 86% compared with the current brackish water supply. Brackish water in Guantao County is mainly used for agricultural irrigation, and its irrigation amount in 2030 and 2035 will be 12.54 million m3 and 12.92 million m3 respectively, accounting for 99.5% and 99.4% of the brackish water supply in that year, respectively. Only a small amount of brackish water is used for industrial production. The research results can provide scientific basis for the safe and rational utilization of brackish water and the expansion of unconventional water sources.
Year: 2025