To elucidate the effects of engineering and agronomic measures on soil water and salt transport in soils with low‐permeability layers, a field experiment was conducted using a dual‐layer subsurface drainage system. Soil water–salt distribution and desalination performance were evaluated under drainage‐only and combined drainage–Fenlong tillage treatments. Under the drainage‐only treatment, four leaching events reduced salinity...

To address the complex many‐to‐many supply–demand relationship between channels and field plots in irrigation systems (where a single channel can irrigate multiple plots and a single plot can receive water from multiple channels), this study developed a novel optimized water distribution model for channel systems. The model innovatively incorporates channel water transmission time parameters to precisely control irrigation seq...

Water productivity (WP) reflects crop yield per unit of water input, but its assessment varies with scale due to differing water inputs and reuse patterns. This study investigates the scale dependency of the WP in the Shijin Irrigation District, the largest well–canal irrigation area in the North China Plain, by defining five scales: crop, field, subbranch canal, main canal and irrigation district. Using the HYDRUS‐1D and MODF...

Open canals are a common water transfer method used in water transfer projects and agricultural irrigation and drainage projects. With the emergence of drawbacks in traditional canal control models and the increasingly severe shortage of water resources, accurate transport and distribution of water in the canal system of the irrigation district, rational allocation of water resources, reduction in water loss, improvement in th...

Coastal eutrophication is a major issue of marine pollution. The main factors controlling eutrophication must be identified to ensure effective marine environmental management according to the respective local conditions. Zhanjiang Bay (ZJB), located northwest of the South China Sea, is a semi-closed bay influenced by complex water flows and the development of surrounding cities. In this study, we investigated the development...

The optimal operation of water distribution systems is an important research area for the modernization of irrigation schemes. In this paper, an improved 0–1 programming model is developed. This model has three objectives: minimum time of water distribution, minimum spacing of tertiary canals in a group, and the minimum difference of water distribution duration among tertiary canals in the group. The study results show that wi...