An actionable hydroeconomic Decision Support System for the assessment of water reallocations in irrigated agriculture. A study of minimum environmental flows in the Douro River Basin, Spain

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:298

Article

Dionisio Perez-Blanco, C.¹  Gil-Garcia, Laura¹  Saiz-Santiago, Pablo² 

[1] Univ Salamanca, Dept Econ & Econ Hist, Francisco Tomas & Valiente S-N, Salamanca 37007, Spain

[2] Douro River Basin Author, C Muro 5, Valladolid 47004, Spain

关键词: Socio-hydrology;    Decision Support Systems;    Mathematical programming;    Environmental flows;    Water scarcity;   

DOI  :  10.1016/j.jenvman.2021.113432

来源: Elsevier

【 摘 要 】

Despite major recent advances in socio-hydrology and hydroeconomics research, interdisciplinary methods and models for water policy assessment remain largely concealed to the academic arena. Most river basin authorities still base decision-making on inputs from hydrologic Decision Support Systems (DSS), and have limited information on the economic costs that water policies may impose on the economy. This paper presents a time-variant hierarchical framework that connects a hydrologic module and an economic module by means of two-way feedback protocols. The hydrologic module is designed to fit the AQUATOOL DSS, the hydrologic model used by Spanish river basin authorities to inform decision-making at a basin scale; while the economic module is populated with a Positive Multi-Attribute Mathematical Programming (PMAMP) model that represents the behavior and adaptive responses of irrigators. The proposed hierarchical framework is used to assess the economic repercussions of strengthening irrigation quotas so to achieve minimum environmental flows in the Douro River Basin (Spain) under climate change. Results show that reductions in agricultural water allocations to meet environmental flow requirements create nonlinear incremental profit and employment losses in irrigated agriculture that are on average low to moderate (between -4% and -12.9 % for profit, and between -4.6 % and -12 % for employment, depending on the scenario). During extreme droughts, the abrupt reductions in water availability and agricultural allocations can test farming systems past the breaking point and lead to catastrophic profit and employment losses (>80 %).

【 授权许可】

Free