On The Study Of Water Consumption Quota Of Rural Domestic Water And Farmland Irrigation Water In Songhua River Basin

With the implementation of national food security strategy,the rapid economic development in rural areas and the living standards of farmers are improved constantly,thus the rural domestic water and farmland irrigation water demands are increasing continuously.In accordance with the requirements of"Assessment Method for Implementation of the Most Strict Water Management System",the implementation of the"control of total amount,quota management”water management mechanism has very important practical significance for the construction of water-saving society,alleviating water resources shortage and realization of sustainable utilization of water resources.Based on the theoretical basis of systematic collection of relevant quota research results at home and abroad,this paper carried out research for the status quo of domestic water and irrigation water in representative regions,collected a lot of data and took the water quota of four provinces(autonomous region)as a reference,the affecting factors of rural domestic water and irrigation water were analyzed from the aspects of living and farmland irrigation,clearly plan the determination method of water quota.In the spatial scale,take the three-level administrative division as the basic unit,striving to fairly reflect the quota changes due to different regional climates and underlying surface conditions,and objectively reflect the water-use efficiency differences in different regions,finally obtained the major research results as follows:(1)Assorted the commonly used determination method of water quota.According to the actual characteristics of the basin,the coverage area is relatively large,and the data statistics are relatively detailed.Based on the statistical analysis method and the typical quota analysis method,to predict the planning level annual water consumption quota based on quota standard issued by the provinces.(2)Divided computational regions of water quota.This study involves three second level regions of water resource,ten third level regions,four provincial administrative regions and 25 municipal administrative regions,in order to facilitate statistical analysis and assessment and in combination with the climate differences,the research areas of this paper are divided into 52 computational units,and unit aggregation was carried according to the three-level administrative division.(3)Division of farmland irrigation area.The farmland irrigation division is based on the comprehensive agricultural division,water conservancy division and water resource division,considering the conditions of water,soil and heat,as well as the farmland irrigation distribution,development direction and integrity of administrative division.(4)Analysis of variation tendency and cause of water quota in rural areas in the last five years.Utilizing the typical area investigation,chart analysis and comparison of the water quota issued by four provinces;the trend and reasons of rural domestic water consumption and farmland irrigation water index were analyzed one by one,so as to lay the foundation for predicting and planning annual water consumption quota level.(5)Forecast the rural domestic water consumption quota.Using Malthus model,simple linear regression model and Logistic model to predict the population of the three-level administrative divisions,it is forecasted the population of this region would reach 18.48 million by 2030.Based on the current mode of water consumption,it is predicted the water demand would reach 559.80*10~6 m~3.Take the data of 2015as a benchmark and determine the suggestive value of rural domestic water quota according to the forecast results of population and water demand,the rural domestic water gross quota is 83L/person·d by 2030.(6)Forecast farmland irrigation water quota.The variation tendency of net irrigation quota value determined in this paper present a progressive increase from east to west,the areas with a lower net quota are located along the outer ring of international rivers,the paddy fields of higher quota areas are below the Jiangqiao,the irrigable lands are located in the Arguna River basin.The utilization coefficient of irrigation water is distributed according to the principle of slightly fast increasing in the near future(according to 45%of added value),moderate in the middle term(according to 35%in 2020)and slowdown in the long term(planning according to20%in 2030),determine the comprehensive utilization efficiency variation of irrigation water is between 0.55-0.78.Finally determine the comprehensive gross quota of farmland irrigation,75%guarantee rate of water supply,gross irrigation quota of paddy field is 410m~3/mu-1147 m~3/mu;irrigable land is 80 m~3/mu-297m~3/mu,vegetable field is 165 m~3/-542 m~3/mu.