城市绿地空间径流下渗与海绵设施参数研究  

Runoff Infiltration in Urban Green Space and Parameters of Sponge Facilities

作　　者：蒋春博 许文斌 高佳玉 李家科[1] 刘柯涵 党振国 Jiang Chunbo;Xu Wenbin;Gao Jiayu;Li Jiake;Liu Kehan;Dang Zhenguo(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi’an University of Technology,Xi’an,Shaanxi 710048,China;Nanchang Urban Planning&Design Institute,Nanchang,Jiangxi 330038,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,陕西西安710048 [2]南昌市城市规划设计研究总院,江西南昌330038

出　　处：《水土保持通报》2023年第4期146-153,169,共9页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目“改良填料生物滞留系统淋溶—堵塞过程与多元阻控机制研究”(52000150);南昌市第二批科技计划项目(2020-NCGCZX-005)。

摘　　要：[目的]对城市绿地空间径流下渗特性与海绵设施参数进行研究,为城市建成区绿地空间海绵设施构建提供理论支持。[方法]以江西省南昌市为例,通过土壤颗粒级配和SPAW(Soil-Plant-Air-Water)模型演算获取土壤特性参数;利用单环现场实测结合Matlab拟合霍顿(Horton)入渗公式,获取初始、稳定入渗率与衰减系数;通过HYPROP2与HYPROP-Data Evaluation Software(HYPROP-DES)测定土壤水张力以及非饱和导水率。[结果]现场入渗开始5~10 min后基本达到稳定入渗过程,且稳定入渗率大部分低于100 mm/h;入渗过程受水文土壤分组差异以及人为扰动等影响较大;土壤在完全饱和状态下约需7 d可以恢复到初始状态的下渗速率;基于RECARGA模型构建了海绵城市理念下绿地空间海绵设施改建技术路线。[结论]3种方法推演绿地土壤下渗过程可提高海绵设施关键参数设计精度。模型演算过程需考虑初始含水率与现场因素影响。[Objective]The infiltration characteristics of urban green space runoff and the infiltration parameters for sponge facilities were studied in order to provide theoretical support for the construction of sponge facilities in built-up urban green space areas.[Methods]Taking Nanchang City,Jiangxi Province as a case area.Soil characteristic parameters were calculated by particle size distribution(PSD)and the soil-plant-air-water(SPAW)model.The Horton infiltration equations were fitted to single-ring infiltration field measurements of infiltration rate using Matlab to obtain the initial and stable infiltration rates and the attenuation coefficient.Soil water tension and unsaturated hydraulic conductivity were estimated by HYPROP2 and HYPROP-data evaluation software(HYPROP-DES).[Results]The stable infiltration rate was basically reached the stage of stable infiltration 5—10 min after the start of on-site infiltration,and most of the observed stable infiltration rates were less than 100 mm/h.The infiltration process was greatly affected by differences in hydrological soil groups and human disturbance.It took about seven days after full saturation for the infiltration rate of the soil to recover to the initial state.Based on the RECARGA model,a technical route for green space sponge facility reconstruction under the concept of sponge city was constructed.[Conclusion]The three methods can be used to deduce the process of urban green space soil infiltration and can improve the design accuracy of key parameters of sponge facilities.Initial water content and site factors need to be considered in the process of model calculations.

关 键 词：雨水径流 绿地空间 水分特征曲线 恢复系数 

分 类 号：X52[环境科学与工程—环境工程]