Abstract
When a city’s water demand cannot be fully satisfied, the hedging rule can reduce water loss by limiting water supply in advance. Based on water supply priority and benefit loss of water shortage for different users, this paper improved the objective function of hedging rules considering the benefit loss of water shortage. At the same time, according to the idea of restricting water supply by water users in turn, improved hedging rules (IHR) are applied to the urban water supply in Tianjin. The conclusions achieved from this study are as follows: (1) IHR increased water supply assurance rates for domestic water with high-priority and avoided destructive water shortages in agricultural water with low-priority. (2) IHR can better reduce the destructive loss caused by a large number of water shortages and the loss of production caused by a small numbers of water shortages than traditional hedging rules, which ensures high efficiency of water supply during the dry period. The results show that the IHR can improve the operational performance of the urban water supply.
Highlights
Over the past decades, solving reservoir operation problems has been a challenge for water resource planners and managers
improved hedging rules (IHR) is shown as Scheme 1 and the results of the traditional hedging rules as Scheme 2
Previous research of hedging rules was based on urban water supply reservoirs [30] based on the hedging sub-rules with two triggers for rationing supply
Summary
Over the past decades, solving reservoir operation problems has been a challenge for water resource planners and managers. The SOP is the most common water supply strategy for reservoirs that meet water demand [1]. To fully meet the water demand at present, the SOP saves excess water until abandonment occurs. This kind of water supply strategy may cause serious water shortages in the later period. To reduce loss of water shortage, Draper and Lund applied the concept of marginal value in economics to the water supply strategy for reservoirs, and proposed to limit water supply when the reservoir has low water supply capacity (storage + inflow) [2]. Hedging rules mean reducing the occurrence of serious water shortages in the future at the expense of small water shortages in the current period [3]
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