夜间灯光改进SWAT模型的建成区径流模拟

Runoff Simulation of Built-up Area Based on Nighttime Light Improved SWAT Model

在极端气候变化和城市化发展的共同驱动下,建成区的扩张直接引起地表径流量增加,对建成区的径流模拟有助于监测水流的变化。以信江流域为研究案例,使用夜间灯光影像提取城市建成区并改进土地利用数据,收集SWAT模型所需的驱动数据集并进行数据预处理,将改进数据输入SWAT模型并进行径流模拟。研究显示,改进SWAT模型在两个水文站点径流模拟的验证期R 2分别为0.86和0.84,NSE分别为0.83和0.76。结果表明,改进SWAT模型在信江流域建成区的应用是可行而有效的。

Driven by extreme climate change and urbanization development,the expansion of built-up areas has directly caused an increase in surface runoff.Runoff simulation in built-up areas can help monitor changes in water flow.Taking the Xinjiang river basin as a case study,nighttime light images were used to extract urban built-up areas and improve land use data,and the required driving data sets of the SWAT model were collected and preprocessed.The improved data are input into the SWAT model and the runoff simulation is carried out.The experiment shows that the R 2 of the runoff simulation of the improved SWAT model is 0.86 and 0.84 respectively in the verification period of the two hydrological stations,and the NSE is 0.83 and 0.76 respectively.The results show that the application of the improved SWAT model in the built-up area of the Xinjiang river basin is feasible and effective.