Improvement Of Basin Irrigation For Water Savings And Salinity Control In The Yellow River Basin, China
2002
A study focusing the improvement of the basin irrigation is performed in the Huinong
Irrigation District, in the upper reaches of the Yellow River basin, Ningxia Province, and in the Bojili
Irrigation District, in the lower reaches of the basin, Shandong Province. Studies include the field
evaluation of current basin irrigation practices and the use of the simulation models SRFR and
SIRMOD to simulate improved designs and practices. The target depths are generated by the
irrigation scheduling simulation model ISAREG. For Huinong, achieving a control of present excess
irrigation water applied and the induced water table rise and salinity requires that the basin water
advance would be completed in a much smaller time than at present. Therefore, improvements on
field sizes, land leveling, infiltration conditions and inflow discharges available are identified aiming at
water savings and controlling waterlogging and salinity. At Bojili, the main problems relate to
excessive field lengths and relatively poor land leveling, which induce very slow advance times and
therefore, either excess water application or the under-irrigation of the downstream part of the field.
Solutions therefore include improved land leveling, larger inflow discharges and reduction of field
lengths. The paper summarizes the approaches used to calibrate the simulation models from field
observations, an analysis of present conditions and performances, and a discussion on the proposed
issues for both areas.
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