An enhanced version of the D-Risk decision support webtool for multi-scale management of water abstraction and drought risks in irrigated agriculture
An enhanced version of the D-Risk decision support webtool for multi-scale management of water abstraction and drought risks in irrigated agriculture
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DOI：
10.1016/j.compag.2022.107516
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发表时间：
2022-11-26
影响因子：
8.3
通讯作者：
Holman, Ian P.
中科院分区：
文献类型：
--
作者：
Chengot, Rishma;Knox, Jerry W.;Holman, Ian P.
由于它具有最低优先级的水分配在干旱事件和随之而来的农艺和经济影响的提取限制，英国灌溉农业已被确定为一个关键的商业部门的风险。开发了一个增强版的D-Risk网络工具，以帮助农业利益攸关方和集水管理人员评估取水限制（自愿和强制）和干旱期间灌溉量不足的联合多尺度风险。该网络工具使用年度最大潜在土壤水分亏缺作为农业气候指数，计算选定作物组合、土壤有效水容量和位置的月度和年度体积灌溉需求。模拟河流流量用于确定不受取水限制的天数。灌溉赤字和许可利用率（净空）的年度概率分布来自每月时间步长水平衡模型，该模型计算每个月的农场灌溉需求是否可以得到满足，考虑到基于河流流量的取水限制，每日和每年的体积许可取水限制，许可取水期和任何农场水库蓄水量。增强的D-Risk工具可以更全面地了解从单个农场到集水区规模的灌溉农业的干旱风险，并支持改善有关未来水资源共享、水交易和农场水库投资的协作决策，以减少业务对干旱和监管变化的脆弱性。
Due to it having the lowest priority for water allocation during drought events and the consequent agronomic and economic impacts of abstraction restrictions, UK irrigated agriculture has been identified as a key business sector 'at risk'. An enhanced version of the D-Risk webtool has been developed to help agricultural stakeholders and catchment water managers to evaluate the joint multi-scale risks of abstraction restrictions (voluntary and mandatory) and having insufficient irrigation volumes during drought events. The webtool uses annual maximum potential soil moisture deficit as the agroclimate index to calculate monthly and annual volumetric irrigation demand for the selected crop mix, soil available water capacity and location. Simulated river flows are used to identify days not under abstraction restrictions. Annual probability distributions of irrigation deficit and licence utilisation (headroom) are derived from a monthly time-step water balance model that calculates whether the farm irrigation demand in each month can be met, taking account of river flow-based abstraction restrictions, daily and annual volumetric licensed abstraction limits, the licenced abstraction period(s) and any on-farm reservoir storage. The enhanced D-Risk tool provides a more holistic understanding of drought risk on irri-gated agriculture from individual farm to catchment scales and supports improved collaborative decision-making regarding future water sharing, water trading and on-farm reservoir investment to reduce business vulnerability to drought and regulatory change.