Spatial Water Allocation under Conjunctive Use

联合利用下的空间水资源分配

• 批准号: 10660209
• 负责人: UMETSU Chieko
• 金额: $ 1.47万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10660209/
• 关键词: irrigation; spatial allocation; agricultural production; negative externality; water pollution; mathematical model; simulation; resource economics

1) Spatial water allocation model for conjunctive use of canal water and groundwater is further developed. In agricultural projects where the utility invest in conveyance costs of the water canal and when the seepage is reused as groundwater, groundwater emerges as an endogenous backstop technology. When the on-farm technology is low and more water is available for re-use, the optimization over the entire water basin leads to significant increases in aggregate output. 2) A particular attention was given to the effects of conveyance on the allocation of both surface and groundwater resources and the distribution of rents. An empirical model indicated that higher conveyance costs skew the distribution of water as well as rents over the project area. This suggests that the tail farmers need to face substantially higher price for water if the system deteriorates and conveyance costs increase in the long run. 3) We extend static spatial allocation model to a dynamic dimension. We develop static model as 3-period dynamic model and compare water allocation, shadow price, rents, on-farm technology over periods. Temporal allocation is governed by the Hotelling rule and spatial allocation of water is constrained by the amount of the initial stock of water at each period. 4) Finally, we try to develop a theoretical model for considering groundwater pollution by agrochemicals and fertilizers.

1)进一步建立了渠道水与地下水联合利用的空间配水模型。在农业项目中，公用事业公司投资于水渠的输送成本，当渗漏作为地下水重复利用时，地下水作为一种内生支持技术出现。当农田技术水平较低，有更多的水可供再利用时，整个流域的优化将导致总产出的显著增加。2)特别注意运输对地表水和地下水资源分配和租金分配的影响。经验模型表明，较高的运输成本扭曲了项目区内的水和租金的分布。这表明，如果系统恶化，从长远来看，运输成本增加，尾部农民需要面临更高的水价。3)将静态空间分配模型扩展到动态维度。我们将静态模型发展为三阶段动态模型，并比较了水资源分配、影子价格、租金、农田技术等不同时期的情况。时间分配受制于霍特林规则，空间分配受制于每个时期的初始蓄水量。4)建立了考虑农药和化肥对地下水污染的理论模型。

项目成果

Umetsu, C.: "The Optimal Dynamic Model of Conjunctive Water Use"Japanese Journal of Rural Economics. (forth coming). (2002)

Umetsu, C.：“联合用水的最佳动态模型”日本农村经济学杂志。

Umetsu, C.: "Basinwide Water Managemant : The Case of Downstream Water Pollution"Agricultural Economic Papers of Kobe University. (forth coming). (2001)

Umetsu, C.：“流域水管理：下游水污染案例”神户大学农业经济论文。