Development And Application Of A Social Hydrological Model Considering Farmers’ Irrigation Behavior In Canal Well Combined Irrigation District

Irrigation is an indispensable prerequisite for the construction of modern agriculture in my country,and it is also an effective way to improve the ecological environment in arid and semi-arid regions.With the continuous improvement of the level of agricultural development in my country,the strengthening and sustainable development of irrigated agriculture in modern irrigation districts will help large-scale irrigation districts.The high-yield and stable production of northern my country’s agriculture and even the country’s food security all play a pivotal role.Since the 1970 s,on the basis of the original canal irrigation facilities,some irrigation areas in northern my country have vigorously developed well irrigation and replaced drainage with well irrigation,forming a canal and well dual irrigation model.The water cycle of canal and well combined irrigation areas is affected by many human activities,so the process is complex and difficult to quantify.Traditional research methods,such as statistical models,can obtain the water balance relationship,but cannot quantitatively calculate the impact of various influencing factors on the water cycle,and it is difficult to accurately describe the groundwater cycle process.In the hydrological model,a module that considers the farmer’s irrigation water behavior factors is needed to build a more realistic water cycle model.This article uses the typical regional canal and well combined irrigation area-Baojixia Irrigation District in Shaanxi Province as the research area.Through field surveys,Collected a large number of irrigation water data of farmers,and based on further analysis and conceptualization of the water cycle characteristics of the combined canal and well irrigation area,tried to use the Python language to build an irrigation water model for farmers in the combined canal and well irrigation area,so that the model can comprehensively consider the irrigation water source and irrigation quota,Irrigation time and irrigation methods and other links on the water cycle of the irrigation area,and finally assume different scenarios to make the model simulate the change trend of the groundwater level in the irrigation area.With a view to providing strong technical support for water resources management in irrigation districts.The main conclusions obtained from the research are as follows:(1)Selecting a “bottom-up” approach to investigate 15 management stations in the Baojixia Irrigation District of Shaanxi Province,screening more than 397 farmers based on conditions,and understanding their corresponding irrigation decision-making arrangements.design the research survey.The survey results show that: farmers have the largest proportion of 1-4 mu of land;the largest proportion of total agricultural income is 3000-8000 yuan,mainly due to the adjustment of the area of arable land and planting structure;the most concerned issue of farmers is the aspect of agricultural water use.Further visualize the collected quantitative and qualitative data,and at the same time provide a data basis for the construction of the model.(2)The system sorts out all aspects of irrigation water,and lists seven influencing factors including water source location conditions,canal well irrigation principles,water price,canal system maintenance,irrigation water volume,groundwater level,and lack of water resources,aiming at the actual water cycle in the irrigation area.According to the situation,a conceptual model of irrigation water used by farmers in the irrigation area combined with channels and wells with four modules including hydrology module,crop module,farmer’s livelihood module and irrigation behavior module has been constructed to realize the close coupling between farmer’s behavior and hydrological and physical processes.The conceptual model can facilitate the arrangement of farmers’ irrigation practices,help farmers improve irrigation water efficiency,increase crop yields,increase agricultural income,guide the government to formulate more scientific irrigation policies,and accelerate agricultural development.(3)The low income of farmers due to unreasonable irrigation methods requires a model to guide farmers’ agricultural production.Based on Python language development,using Num Py,Pandas,Matplotlib,Seaborn and other extension libraries to construct four submodules: hydrological function(Hydrological＿Model),crop yield function(Crop＿Model),farmer’s livelihood function(Livelihood＿Model)and auxiliary function module(Utility＿model).The simulation result output mainly includes three parts: daily groundwater level change,crop yield and farmer income.The prediction result of the model assumes that the irrigation method is the combination of channel and well and the simulated groundwater change results are more accurate,which verifies the rationality of the calculation process of the HCLU model and the correctness of the simulation results.(4)Based on the farmer irrigation water model,this paper simulates the impact of canal well combined with irrigation on groundwater in irrigation area,sets different irrigation scenarios,and makes great improvement in the simulation of irrigation amount.It simulates the change trend of groundwater depth in irrigation area under different canal well irrigation water proportion,different water-saving efficiency,different planting structure proportion and their combination.The proportion of canal and well water has the greatest influence on the groundwater dynamics in the irrigation area.Using water-saving measures can make the groundwater depth rise to a certain extent.The increase of the proportion of economic crops will not only increase the income of farmers,but also reduce the groundwater depth.It provides theoretical guidance for farmers to reasonably arrange irrigation and adjust the appropriate planting structure,choose irrigation methods and improve their income.