半湿润地区公园绿地径流收集灌溉利用成本研究——以迁安市滨湖东路集雨型绿地为例

Runoff collection and irrigation utilization cost of park green space in semi humid area:a case study of the green space of East Binhu Road in Qian’an City,Hebei Province of northern China

【目的】为探索半湿润地区城市公园绿地海绵城市建设的可行性和经济性,为设计师和决策者提供经济层面的决策参考,本文以雨水径流收集灌溉利用的成本效益为研究内容,以河北省迁安市滨湖东路已建成集雨型绿地为研究对象,研究半湿润地区公园绿地径流收集灌溉利用成本。【方法】根据场地径流量确定雨水调蓄池容积,基于2014-2021年逐日实测降雨数据和2022-2024年预测降雨数据,利用容积法测算年收集径流量,对比绿地完全用自来水灌溉成本和用收集径流与自来水共同灌溉成本,得到节约成本,并对比建设成本和维护成本得出建设效益。【结果】基于2014-2021年的实际降雨数据和2022-2024年的预测降雨数据与建设成本测算,在汇水面积为155.37 hm;、灌溉面积为151.410 hm;时,以解决径流为目的,从长期效益出发,调蓄池规模最佳选择方案为3 000 m^(2),年平均节约灌溉费用101 114.15元,年平均效益65 424.15元。【结论】半湿润地区径流收集灌溉利用具有一定效益,基于某个时间段内植物的灌溉需求量作为径流收集的标准,可明显减少建设成本,增加径流利用效率。

[Objective] In order to explore the feasibility and economy of urban park green space sponge city construction in semi humid area and provide economic decision-making reference for designers and decision makers, this paper takes the cost-effectiveness of rainwater runoff collection and irrigation as the research content, and takes the built rainwater collection green space on Binhu East Road, Qian’an City,Hebei Province of northern China as the research object to study the cost of rainwater collection and irrigation of park green space in semi humid area. [Method] The volume of rainwater storage tank was determined according to the site runoff. Based on the daily measured rainfall data from 2014 to 2021 and the predicted rainfall data from 2022 to 2024, the volume method was used to calculate the annual collected runoff. The cost savings were obtained by comparing the cost of green land irrigation with tap water and the cost of irrigation with collected runoff and tap water, and the construction benefits were obtained by comparing the construction cost and maintenance cost. [Result] Based on the actual rainfall data from 2014 to 2021, the predicted rainfall data from 2022 to 2024 and the calculation of construction cost, when the catchment area was 155.37 ha and the irrigation area was 151.410 ha, for the purpose of solving runoff and from the perspective of long-term benefits, the best scheme for the scale of regulating and storage tank was 3 000m^(2), and the average annual irrigation cost was 101 114.15 CNY, the average annual benefit was 65 424.15 CNY. [Conclusion] Runoff collection and irrigation utilization in semi humid areas has certain benefits. Taking the irrigation demand of plants in a certain period of time as the standard of runoff collection can significantly reduce the construction cost and increase the runoff utilization efficiency.