| 地形和土壤/土地利用空间聚合对径流和输沙量影响的AnnAGNPS模拟 |
| |
| 引用本文： | 钟科元,陈兴伟,陈 莹,刘梅冰.地形和土壤/土地利用空间聚合对径流和输沙量影响的AnnAGNPS模拟[J].农业工程学报,2016,32(8):127-135. |
| |
| 作者姓名： | 钟科元 陈兴伟 陈 莹 刘梅冰 |
| |
| 作者单位： | 1. 福建师范大学地理科学学院,福州,350007;2. 福建师范大学地理科学学院，福州 350007; 湿润亚热带山地生态国家重点实验室培育基地，福州 350007; 福建省陆地灾害监测评估工程技术研究中心，福州 350007 |
| |
| 基金项目： | 国家自然科学基金项目（41301031）；福建省科技厅重点项目（2013N0013）。 |
| |
| 摘 要： | 为进一步揭示分布式水文模型子流域划分对径流和输沙量模拟的影响,以东南沿海桃溪流域为研究区,构建日尺度产流产沙的AnnAGNPS模型,基于9种不同临界源面积(critical source area,CSA),分析了不同子流域划分对输入参数空间聚合的影响,并设置7种组合情景,分别从年和日尺度,定量区分了地形与土壤/土地利用参数的空间聚合对产流产沙过程的影响。结果表明:1)随着CSA取值的增加,地形、土壤和土地利用类型在空间上存在明显的聚合。2)土壤/土地利用参数空间聚合导致年平均径流量和输沙量减少,且对输沙量影响更显著;地形参数的空间聚合导致年输沙量减少,但对年平均径流量无显著影响。3)地形参数的空间聚合造成的洪峰流量增加、峰现时间提前,是影响日径流过程变化的主要因素。4)土壤/土地利用参数的空间聚合对多年平均最大1 d、连续最大5 d输沙量的影响随着聚合程度的增加而显著下降,而地形参数的空间聚合造成日输沙过程峰值的出现时间提前。
|
| 关 键 词： | 地形 土壤 土地利用 模型 径流 泥沙 水文效应 AnnAGNPS 参数聚合 |
| 收稿时间： | 2015/10/7 0:00:00 |
| 修稿时间： | 2016/2/11 0:00:00 |
Simulation of effects of topography and soil/land use spatial aggregation on sediment yield and runoff using AnnAGNPS |
| |
| Zhong Keyuan,Chen Xingwei,Chen Ying and Liu Meibing.Simulation of effects of topography and soil/land use spatial aggregation on sediment yield and runoff using AnnAGNPS[J].Transactions of the Chinese Society of Agricultural Engineering,2016,32(8):127-135. |
| |
| Authors: | Zhong Keyuan Chen Xingwei Chen Ying and Liu Meibing |
| |
| Institution: | 1. College of Geographical Science Fujian Normal University, Fuzhou 350007, China;,1. College of Geographical Science Fujian Normal University, Fuzhou 350007, China; 2. Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China; 3. Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters, Fuzhou 350007, China;,1. College of Geographical Science Fujian Normal University, Fuzhou 350007, China; 2. Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China; 3. Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters, Fuzhou 350007, China; and 1. College of Geographical Science Fujian Normal University, Fuzhou 350007, China; 2. Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China; 3. Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters, Fuzhou 350007, China; |
| |
| Abstract: | The parameter spatial aggregation has significant impacts on the results of Annualized Agricultural Nonpoint Source Pollution model (AnnAGNPS). Parameter spatial aggregation mainly includes spatial aggregation of topographic (T) parameters and soil & land use (SL) parameters. The previous studies mainly focused on the coupling impacts of the 2 kinds of parameters’ spatial aggregation on the hydrologic process, lacking the separate impacts of the 2 kinds of parameters’ spatial aggregation on the hydrologic process in different time scales, and the comparison of the impacts of 2 kinds of parameters’ spatial aggregation on hydrologic process. The objective of this study was to distinguish the impacts of T parameters aggregation and SL parameters aggregation on the simulation results of the AnnAGNPS. Taoxi watershed which is located in the southeast of China was selected as the study area. Based on the sensitivity analysis of parameter by differential sensitivity analysis (DSA) method, the AnnAGNPS model with the daily time step was set up. Nine discretization scenarios including 15, 30, 50, 70, 100, 150, 200, 250 and 300 hm2 were established, and 6 topographic indices (i.e., channel length, slope length of subbasin, average slope of channel, maximum gradient of channel, average slope of subbasin and maximum gradient of subbasin) and the areas of different soil and land use types were calculated to evaluate the impact of cell division on the parameter aggregation. And then 7 combination scenarios were carried out to evaluate the impact of T and SL parameters spatial aggregation on runoff and sediment yield at annual and daily time scale, the scenarios T15SL15, T15SL50, T15SL100 and T15SL300 with the same T parameters aggregation were used to analyze the effect of SL parameters spatial aggregation on hydrologic process, and the scenarios T15SL300, T50SL300, T100SL300 and T300SL300 with the same SL parameters aggregation were used to analyze the effect of T parameters spatial aggregation on sediment yield and runoff. The results showed as follows: 1) The aggregation effects of T and SL parameters significantly increased with the increasing of critical source area (CSA). 2) The spatial aggregation of SL parameters reduced the annual runoff and annual sediment yield, and the predicated sediment yield decreased at a greater rate compared to annual runoff responding to the increase in values of CSA; while the T parameters aggregation reduced the annual sediment yield, but had not significant influence on the annual runoff. 3) Aggregation of T parameters was the main factor affecting the daily runoff process, resulting in the increase of peak runoff and the decrease of the time reaching the peak runoff, and its influence on the annual maximum one-day runoff was greater than the annual maximum five-day runoff. 4) The spatial aggregation of SL parameters had great effects on annual maximum one-day and annual maximum five-day sediment load, and the annual maximum one-day and annual maximum five-day sediment load decreased significantly with the increase of aggregation degree. The change ratio of the annual maximum five-day sediment load was a little larger than that of the annual maximum one-day. Additionally, the T parameters aggregation resulted in the decrease of the time reaching the peak sediment. |
| |
| Keywords: | topography soils land use models runoff sediments hyduology effect AnnAGNPS parameter aggregation |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《农业工程学报》浏览原始摘要信息 |
| 点击此处可从《农业工程学报》下载免费的PDF全文 |
|
