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| 基于SWAT模型的延河流域土地利用对径流影响模拟研究 | |
| 其他题名 | Runoff Response to Land Use Change in the Yan River Using |
| 赵传普 | |
| 出版年 | 2015 |
| 学位类型 | 硕士 |
| 导师 | 徐学选 |
| 学位授予单位 | 中国科学院大学 |
| 中文摘要 | 基于SWAT模型的延河流域土地利用对径流影响模拟研究 学生姓名：赵传普 导师姓名：徐学选 专 业：水土保持与荒漠化防治 研究方向：流域管理 摘 要 本文以黄土高原典型流域——延河流域作为研究区，建立SWAT水文模型基础数据库及确定其适用参数，并对流域多年月径流量进行模拟验证。在此基础上，研究了流域土地利用对径流的影响。主要研究成果如下： 1）构建了延河流域SWAT水文模型基础数据库。收集并处理模型运行所需流域基础资料，主要包括DEM数据、土地利用数据、土壤数据和气象数据，建立模型运行所需数据库。 2）确立了适用于延河流域的SWAT模型输入参数值。采用数字滤波法分割基流量，确定基流指数。在此基础上，运用SWAT-CUP进行模型参数率定及验证，确定了14个径流模拟敏感参数适用值。对径流模拟结果影响最大的前5个参数分别为：CN2、SOL_BD、SOL_K、ALPHA_BNK、GWQMN。 3）评价了SWAT模型在延河流域的适用性。本文选择甘谷驿水文站1982-1988年实测月均径流量对模型参数率定，参数率定期决定系数R2=0.74且纳什效率系数NS=0.69；采用1991-1996年实测月均流量进行参数验证，验证期决定系数R2=0.79且纳什效率系数NS=0.72，符合模型评价标准。但是，在验证期峰值流量模拟效果欠佳。 4）土地利用对径流影响分析表明：相同气象条件下，植被恢复等生态治理措施对流域产流有较大影响，导致径流量及基流量减少，基流指数增大。研究发现相同气象条件下，1985年土地利用情景下的年均地表径流量为30.26 mm，其中基流量为14.60 mm，基流指数为0.48；2010年土地利用情景下的年均地表径流量为24.03 mm，年均基流量为12.78 mm，基流指数为0.53。1985年土地利用情景下甘谷驿水文站年均河道径流量模拟值为5.21 m3/s，2010年土地利用情景下为4.47 m3/s，比1985年减少0.74 m3/s，减幅为-14.2%。 关键词：延河流域；土地利用变化；SWAT模型；径流模拟；基流 |
| 英文摘要 | Runoff Response to Land Use Change in the Yan River Watershed Using SWAT Model Student: Zhao Chuanpu Supervisors: Xu Xuexuan Major: Soil and Water Conservation Research field: Watershed Management ABSTRACT This paper selects the typical watershed in loess plateau – Yan river watershed as the study area .The basic database and parameter system of SWAT model are constructed to simulate and validate the monthly runoff in the Yan river watershed. Then we studied the runoff response to land use change in the watershed. The main conclusions of the study are as follows: 1) The basic database of SWAT model is constructed. The basic data of the Yan river watershed are collected and processed, including DEM data, the land use data, soil data, meteorological data and the other data SWAT model needed. 2）The SWAT model’s input parameters and its applicable value were determined. Digital filtering method is used to calculate the baseflow index, then the SWAT-CUP is selected to calibrate and validate the input parameters, the values of 14 sensitive parameters are determined. The five parameters which have great influence on the runoff simulation results are: CN2 (Runoff curve number), SOL_BD (Moist bulk density), SOL_K (Saturated hydraulic conductivity), ALPHA_BNK (Baseflow alpha factor for bank storage), GWQMN(Threshold depth of water in the shallow aquifer required for return flow to occur). 3) To evaluate the applicability of the SWAT model in Yan river watershed . The monthly runoff data of the Ganguyi hydrological station from 1982 to 1988 are used for model calibration. In the calibration period, R2=0.74 and NS=0.69. The monthly data from 1991 to 1996 are used for model validation. In the validation period, R2=0.79 and NS=0.72. The results can meet the evaluation criteria, but in the validation period simulation values are lower than the measured values in the month with larger runoff. 4) Analysis of hydrological response to land use change show that vegetation restoration has greate influence on stream flow,which reduces the runoff. The annual surface runoff is 30.26 mm , the annual base flow is 14.60 mm and the baseflow index is 0.48 under the land use situation in 1985; The annual surface runoff is 24.03 mm , the annual base flow is 12.87 mm and the baseflow index is 0.53 under the land use situation in 2010. The annual simulation value of stream flow is 5.21 m3 / s at the Ganguyi hydrological station under the land use situation in 1985. The annual simulation value of stream flow is 4.47 m3 / s at the Ganguyi hydrological station under the land use situation in 2010, which decreased by 0.74 m3 / s, the rate of change is -14.2%. Key Words： Yan river watershed; Land use change; SWAT model;Runoff simulation;Baseflow 2）The SWAT model’s input parameters and its applicable value was determined. Digital filtering method is used to split the measured stream flow, and then we use the SWAT model to simulate runoff. The SWAT-CUP is selected to calibrate and validate the input parameters, the values of 14 sensitive parameters are determined. The five parameters which have great influence on the runoff simulation results are: CN2 (Runoff curve number), SOL_BD (Moist bulk density), SOL_K (Saturated hydraulic conductivity), ALPHA_BNK (Baseflow alpha factor for bank storage), GWQMN(Threshold depth of water in the shallow aquifer required for return flow to occur). 3) To evaluate the applicability of the SWAT model in yan river watershed . The monthly runoff data of the Ganguyi hydrological station from 1982 to 1988 are used for model calibration. In the calibration period, R2=0.74 and NS=0.69. The monthly data from 1991 to 1996 are used for model validation. In the validation period, R2=0.79 and NS=0.72. The results meet the evaluation criteria, but in the validation period simulation values are lower than the measured values in the month with larger runoff, and the simulation values coordinate not very well wit |
| 中文关键词 | 延河流域 ; 土地利用变化 ; SWAT模型 ; 径流模拟 ; 基流 |
| 英文关键词 | Yan river watershed Land use change SWAT model Runoff simulation Baseflow |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源学科分类 | 水土保持与荒漠化防治 |
| 来源机构 | 中国科学院水利部水土保持研究所 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/287584 |
| 推荐引用方式 GB/T 7714 | 赵传普. 基于SWAT模型的延河流域土地利用对径流影响模拟研究[D]. 中国科学院大学,2015. |
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