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）进一步发展渠道水与地下水联合利用的空间水分配模型。在农业项目中，公用事业公司投资水渠的输送成本，并且当渗漏物被重新用作地下水时，地下水作为一种内生后备技术出现。当农场技术水平较低且有更多水可供再利用时，整个流域的优化会导致总产量显着增加。 2）特别关注运输对地表和地下水资源分配以及租金分配的影响。实证模型表明，较高的运输成本会扭曲项目区域的水分配和租金。这表明，如果系统恶化并且从长远来看运输成本增加，尾农需要面临大幅上涨的水价。 3）我们将静态空间分配模型扩展到动态维度。我们将静态模型开发为三期动态模型，并比较不同时期的水分配、影子价格、租金、农场技术。水的时间分配受霍特林规则控制，水的空间分配受每个时期初始水存量的限制。 4）最后，我们尝试建立一个考虑农用化学品和肥料污染地下水的理论模型。

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。