海河平原农业供水的决策分析模型

海河平原农业供水的决策分析模型

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contributed at 2018-12-04

Authorship

Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
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Classification(s)

Application-focused categoriesNatural-perspectiveLand regions
Application-focused categoriesHuman-perspectiveEconomic activities
Application-focused categoriesIntegrated-perspectiveRegional scale

Model Description

Chinese {{currentDetailLanguage}} Chinese

海河平原农业供水的决策分析模型

1.   目标函数

     

式中,表示保证率为p的第i种灌溉方式的灌溉面积,i=1,2,3,4,5,  1为河灌,2为滴灌,3为喷灌,4为引江渠灌,5为管(带)灌,2,3,5属于节水灌溉技术,p=1,2,3150%275%395%);表示灌溉方式为i、作物结构为n、在水量保证率P时灌溉供水的增产效益,n为农作物综合项目(小麦、玉米、棉花、谷子等),i=1,2,3,4,5的意义同前,其计算公式为:Lp为灌溉效益的分摊系数,Pn为农产品的单位价格;W为灌溉水量;abn而变(这里分析计算中是固定的);表示由n中农作物结构和保证率p确定的i种灌溉方式的灌溉定额,在海河平原取n=1,2,3,41为小麦,2为玉米,3为棉花,4为谷子);表示保证率为p时第i种灌溉方式(技术)的年成本,m为综合成本项目(设备费、水源工程费和运行费等),一般取各项目费用之和;表示农业用水的管理水平,以水的有效利用率为指标。在海河平原,管理水平较低时,λ1=0.35,管理水平较高时λ2=0.6.

2.   约束条件

以下分述约受条件约束方程:

(1)供水约束;

  首先,总的可供水量应满足区域总体的供需平衡,即:

              

式中,要是保证率为p时第j种供水来源的可供水量。这里j=1,2,3,4,5,6(1为山口水库对平原的供水,2为平原水库供水,3为闸、坝、塘的供水,4为地下水提水,5为引黄供水,6为引江渠灌供水)D为需水量。

        其次,各种频率下可供水量都应满足区域总体的供需平衡:

           

          

             

(2)灌溉面积限制条件:

在不同的灌溉保证率下,各种灌溉技术所灌溉的农田灌溉面积的总和应当等于当地实际有效灌溉面积。

         

         

         

(3)灌溉方式限制条件:

 由于农业生产灌溉技术水平和农业经济条件、自然条件的限制,各种灌溉技术只能在农业灌区的一定范围内实施,因此,各种灌溉技术的灌溉面积(亩)应当是有限制的:

                     

(4)节水灌溉面积关系限制条件

不同的灌溉技术在同等的水量条件下所灌溉的面积大小是不同的,它们之间有一定的对应关系。例如在同等水量条件下,滴灌面积可以是河灌的3倍,但不大于3倍,喷管面积是河灌的2倍,以2倍为限。

                         

                         

                         

                         

                         

                         

                         

                         

                         

                         

(5)负限制条件;

 各种灌溉技术的灌溉面积都应当是正值,至少等于零,出现负值就失去了物理意义,因此有:

                          

 在计算时,不同的灌区可以根据当地的实际情况来选择模型参数,使模型的最优解更加接近实际,精度更高。

参考文献:

   刘昌明;海河平原农业供水的决策分析模型。自然资源学报,1988,33

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How to Cite

《资源环境数学模型手册》 (2018). 海河平原农业供水的决策分析模型, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/bd3b9b2e-b094-46d5-bdff-28041a13eb50
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Last modifier : 
Zihuan Wang
Last modify time : 
2020-10-31
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Contributor(s)

Initial contribute: 2018-12-04

Authorship

Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
Homepage:  
View
Is authorship not correct? Feedback

History

Last modifier : 
Zihuan Wang
Last modify time : 
2020-10-31
Modify times : 
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