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Basin Irrigation

The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

Yinong Li – 1st expert on this subject based on the ideXlab platform

  • A Non-Uniform Broadcast Fertilization Method and Its Performance Analysis under Basin Irrigation
    Water, 2020
    Co-Authors: Kai Zhang, Shaohui Zhang, Yinong Li, Di Xu

    Abstract:

    The broadcast fertilization method is widely used under Basin Irrigation in China. A reasonable broadcast fertilization method can effectively improve application performance of fertilization and reduce pollution from non-point agricultural sources. In this study, firstly, a non-uniform broadcast fertilization method and a non-uniform application coefficient were proposed. The value of non-uniform application coefficient is defined in this paper. It represents the ratio of the difference between the maximum and the average fertilization amount of fertilizer applied on the Basin surface to the average fertilization amount of fertilizer applied on the Basin surface. Secondly, field experiments were conducted to study the movement characteristics of fertilizer under non-uniform broadcast fertilization for Basin Irrigation. Field experiment results showed that under the condition of Basin Irrigation, the non-uniform broadcast fertilization method could weaken the non-uniform distribution of fertilizer due to erosion and transport capacity of solid fertilizer by Irrigation water flow, which could significantly improve the uniformity of soil solute content. Thirdly, the solute transport model for broadcast fertilization was corroborated by the field experiment results. The variation rule of fertilization performance with non-uniform application coefficient under different Basin length and inflow rate was achieved by simulation. The simulation results showed that fertilization uniformity and fertilization storage efficiency increased first and then decreased with the increase of non-uniform application coefficient. In order to be practically applicable, suitable Irrigation programs of non-uniform application coefficient under different Basin length and inflow rate conditions were proposed by numerical simulation.

  • Coupled impact of spatial variability of infiltration and microtopography on Basin Irrigation performances
    Irrigation Science, 2017
    Co-Authors: Di Xu, Yinong Li, Shaohui Zhang

    Abstract:

    Soil surface elevation and infiltration are two key variables that affect Basin Irrigation performances. A number of sets of spatially variable surface elevation and infiltration parameters were generated using stochastic modeling, and a 2D Basin Irrigation model was used to simulate Irrigation for the generated sets. Strip, narrow, and wide Basins, with different slope, land leveling precision, infiltration variation and inflow rate were analyzed. The coupled influence of spatial variation of microtopography and infiltration on Irrigation performance, relationship between the influence degrees and degrees of spatial variance, and other Irrigation factors were discussed. Results show that the Basin Irrigation performance decreased with increased spatial variability of microtopography and infiltration. The effect of the spatial variability of microtopography became more obvious when S
    d (land leveling precision) was more than 1 cm. Smaller spatial variability of infiltration resulted in a stronger influence degree of microtopography on Irrigation performance, and increasing the inflow can weaken this influence. The spatial variability of infiltration mainly affected the Irrigation uniformity CU, and the effect on the infiltrated depth when advance was completed (Z
    adv) was very small. The influence of infiltration variation on Irrigation performances increased with Enhanced land leveling precision, especially for zero-leveled Basins. For such Basins, the influence of infiltration variation on Irrigation performance should be paid more attention in the design and management of Irrigation systems.

  • Two-dimensional zero-inertia model of surface water flow for Basin Irrigation based on the standard scalar parabolic type
    Irrigation Science, 2014
    Co-Authors: Shaohui Zhang, Di Xu, Yinong Li

    Abstract:

    The two-dimensional zero-inertia equations for Basin Irrigation were formulated as a standard scalar diffusion equation subject to neumann boundary condi- tions. The formulation can handle anisotropic variations in hydraulic resistance. a numerical solution was developed using finite-volume method on unstructured triangular cells. The simulation performance of the constructed model was validated based on typical experimental data. The com- plete hydrodynamic model of Basin Irrigation was selected as the comparative model. The validated results show that the constructed model can successfully simulate the Basin surface water flow when the Basin surface microtopog- raphy condition is relatively smooth. Similar results were found in terms of both the water quantity conservation and

Shaohui Zhang – 2nd expert on this subject based on the ideXlab platform

  • A Non-Uniform Broadcast Fertilization Method and Its Performance Analysis under Basin Irrigation
    Water, 2020
    Co-Authors: Kai Zhang, Shaohui Zhang, Yinong Li, Di Xu

    Abstract:

    The broadcast fertilization method is widely used under Basin Irrigation in China. A reasonable broadcast fertilization method can effectively improve application performance of fertilization and reduce pollution from non-point agricultural sources. In this study, firstly, a non-uniform broadcast fertilization method and a non-uniform application coefficient were proposed. The value of non-uniform application coefficient is defined in this paper. It represents the ratio of the difference between the maximum and the average fertilization amount of fertilizer applied on the Basin surface to the average fertilization amount of fertilizer applied on the Basin surface. Secondly, field experiments were conducted to study the movement characteristics of fertilizer under non-uniform broadcast fertilization for Basin Irrigation. Field experiment results showed that under the condition of Basin Irrigation, the non-uniform broadcast fertilization method could weaken the non-uniform distribution of fertilizer due to erosion and transport capacity of solid fertilizer by Irrigation water flow, which could significantly improve the uniformity of soil solute content. Thirdly, the solute transport model for broadcast fertilization was corroborated by the field experiment results. The variation rule of fertilization performance with non-uniform application coefficient under different Basin length and inflow rate was achieved by simulation. The simulation results showed that fertilization uniformity and fertilization storage efficiency increased first and then decreased with the increase of non-uniform application coefficient. In order to be practically applicable, suitable Irrigation programs of non-uniform application coefficient under different Basin length and inflow rate conditions were proposed by numerical simulation.

  • Coupled impact of spatial variability of infiltration and microtopography on Basin Irrigation performances
    Irrigation Science, 2017
    Co-Authors: Di Xu, Yinong Li, Shaohui Zhang

    Abstract:

    Soil surface elevation and infiltration are two key variables that affect Basin Irrigation performances. A number of sets of spatially variable surface elevation and infiltration parameters were generated using stochastic modeling, and a 2D Basin Irrigation model was used to simulate Irrigation for the generated sets. Strip, narrow, and wide Basins, with different slope, land leveling precision, infiltration variation and inflow rate were analyzed. The coupled influence of spatial variation of microtopography and infiltration on Irrigation performance, relationship between the influence degrees and degrees of spatial variance, and other Irrigation factors were discussed. Results show that the Basin Irrigation performance decreased with increased spatial variability of microtopography and infiltration. The effect of the spatial variability of microtopography became more obvious when S
    d (land leveling precision) was more than 1 cm. Smaller spatial variability of infiltration resulted in a stronger influence degree of microtopography on Irrigation performance, and increasing the inflow can weaken this influence. The spatial variability of infiltration mainly affected the Irrigation uniformity CU, and the effect on the infiltrated depth when advance was completed (Z
    adv) was very small. The influence of infiltration variation on Irrigation performances increased with Enhanced land leveling precision, especially for zero-leveled Basins. For such Basins, the influence of infiltration variation on Irrigation performance should be paid more attention in the design and management of Irrigation systems.

  • Efficient Simulation of Surface Water Flow in 2D Basin Irrigation Using Zero-Inertia Equations
    Journal of Irrigation and Drainage Engineering-asce, 2016
    Co-Authors: Shaohui Zhang, Hongjing Yu

    Abstract:

    AbstractZero-inertia equations are more easily numerically solved than complete hydrodynamic equations. Thus, the zero-inertia equations were applied to describe the surface water flows in 2D Basin Irrigation. Then, finite-volume and finite-difference approaches in the spatial cell and cell interface spatially were applied to discretize the continuous and momentum components of zero-inertia equations, respectively. Meanwhile, a dual time-stepping approach was implicitly implemented to achieve unconditional stability. The Gauss–Seidel iterative method was used to solve the space–time discretized expressions of the zero-inertia equations, and an efficient numerical model for 2D Basin Irrigation was developed. Three field experiments were conducted to validate the developed model. The validated results show that the developed model presents good agreement between the simulated and observed data, and achieves more mass conservation than the existing model. Its high efficiency is suitable for practical enginee…

Di Xu – 3rd expert on this subject based on the ideXlab platform

  • A Non-Uniform Broadcast Fertilization Method and Its Performance Analysis under Basin Irrigation
    Water, 2020
    Co-Authors: Kai Zhang, Shaohui Zhang, Yinong Li, Di Xu

    Abstract:

    The broadcast fertilization method is widely used under Basin Irrigation in China. A reasonable broadcast fertilization method can effectively improve application performance of fertilization and reduce pollution from non-point agricultural sources. In this study, firstly, a non-uniform broadcast fertilization method and a non-uniform application coefficient were proposed. The value of non-uniform application coefficient is defined in this paper. It represents the ratio of the difference between the maximum and the average fertilization amount of fertilizer applied on the Basin surface to the average fertilization amount of fertilizer applied on the Basin surface. Secondly, field experiments were conducted to study the movement characteristics of fertilizer under non-uniform broadcast fertilization for Basin Irrigation. Field experiment results showed that under the condition of Basin Irrigation, the non-uniform broadcast fertilization method could weaken the non-uniform distribution of fertilizer due to erosion and transport capacity of solid fertilizer by Irrigation water flow, which could significantly improve the uniformity of soil solute content. Thirdly, the solute transport model for broadcast fertilization was corroborated by the field experiment results. The variation rule of fertilization performance with non-uniform application coefficient under different Basin length and inflow rate was achieved by simulation. The simulation results showed that fertilization uniformity and fertilization storage efficiency increased first and then decreased with the increase of non-uniform application coefficient. In order to be practically applicable, suitable Irrigation programs of non-uniform application coefficient under different Basin length and inflow rate conditions were proposed by numerical simulation.

  • Coupled impact of spatial variability of infiltration and microtopography on Basin Irrigation performances
    Irrigation Science, 2017
    Co-Authors: Di Xu, Yinong Li, Shaohui Zhang

    Abstract:

    Soil surface elevation and infiltration are two key variables that affect Basin Irrigation performances. A number of sets of spatially variable surface elevation and infiltration parameters were generated using stochastic modeling, and a 2D Basin Irrigation model was used to simulate Irrigation for the generated sets. Strip, narrow, and wide Basins, with different slope, land leveling precision, infiltration variation and inflow rate were analyzed. The coupled influence of spatial variation of microtopography and infiltration on Irrigation performance, relationship between the influence degrees and degrees of spatial variance, and other Irrigation factors were discussed. Results show that the Basin Irrigation performance decreased with increased spatial variability of microtopography and infiltration. The effect of the spatial variability of microtopography became more obvious when S
    d (land leveling precision) was more than 1 cm. Smaller spatial variability of infiltration resulted in a stronger influence degree of microtopography on Irrigation performance, and increasing the inflow can weaken this influence. The spatial variability of infiltration mainly affected the Irrigation uniformity CU, and the effect on the infiltrated depth when advance was completed (Z
    adv) was very small. The influence of infiltration variation on Irrigation performances increased with Enhanced land leveling precision, especially for zero-leveled Basins. For such Basins, the influence of infiltration variation on Irrigation performance should be paid more attention in the design and management of Irrigation systems.

  • Two-dimensional zero-inertia model of surface water flow for Basin Irrigation based on the standard scalar parabolic type
    Irrigation Science, 2014
    Co-Authors: Shaohui Zhang, Di Xu, Yinong Li

    Abstract:

    The two-dimensional zero-inertia equations for Basin Irrigation were formulated as a standard scalar diffusion equation subject to neumann boundary condi- tions. The formulation can handle anisotropic variations in hydraulic resistance. a numerical solution was developed using finite-volume method on unstructured triangular cells. The simulation performance of the constructed model was validated based on typical experimental data. The com- plete hydrodynamic model of Basin Irrigation was selected as the comparative model. The validated results show that the constructed model can successfully simulate the Basin surface water flow when the Basin surface microtopog- raphy condition is relatively smooth. Similar results were found in terms of both the water quantity conservation and