An efficient method on deriving topographic index from dem for land surface hydrological model simulations
文献类型：期刊论文
| 作者 | Xu Jingwen1,2,3; Zhang Wanchang1; Sun Chengwu4; Fu Congbin1 |
| 刊名 | Acta meteorologica sinica
 |
| 出版日期 | 2009-10-01 |
| 卷号 | 23期号:5页码:609-616 |
| 关键词 | Topmodel Topographic index (ti) Digital elevation model (dem) Pits Flat areas |
| ISSN号 | 0894-0525 |
| 通讯作者 | Zhang wanchang(zhangwc@tea.ac.cn) |
| 英文摘要 | As a kernel parameter of the topmodel-concept-based land surface model (lsm), topographic index (ti) is commonly derived from high resolution digital elevation model (dem). various approaches to compute ti by using different algorithms have been developed in previous literature. however, flat areas and pits in dems of real watershed sometimes impose an arbitrary and spatially constant drainage density which may cause conventional retrieval methods to be very computer-intensive, especially for regional or global climate simulations where rugged mountainous areas are mixed with flat terrains in the dem. in this paper, we propose a new approach to overcome this shortcoming by introducing a quantile classification to sort the dem into eight categories at first and then using a fast and simple algorithm to process the flat areas, fill lip pits in the dem, and make it undulating. thereafter, the algorithm can be directly applied to assigning flow directions of each cell of the processed dem rather than taking the complicated approach of jenson and domingue. this approach dramatically promotes the computing efficiency with a much easier and faster processing. in addition, the effects of different ti computing approaches on the topmodel-concept-based hydrological simulations are investigated based on experimental simulation over a small-scale watershed gauged by the youshuijie hydrological station and a large-scale watershed controlled by the hanzhong hydrological station, respectively. the results show that the new approach is 13 times faster than the conventional one in ti retrieving, and no evident differences are found in rainfall-runoff simulations when using different algorithms in ti computations. these suggest that the proposed new approach for ti computation can be taken as an alternative and used in the topmodel-concept-based hydrological simulations owning to its simplicity and high efficiency, especially for relevant regional and global studies. |
| WOS关键词 | DIGITAL ELEVATION MODELS |
| WOS研究方向 | Meteorology & Atmospheric Sciences |
| WOS类目 | Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000273105500008 |
| 出版者 | ACTA METEOROLOGICA SINICA PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2397879 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Zhang Wanchang |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Reg Climate Environm Res Temperate E Asia, Inst Atmospher Phys, Beijing 100029, Peoples R China 2.Sichuan Agr Univ, Coll Resource & Environm, Yaan 625014, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 4.Linyi Bur Meteorol, Linyi 276004, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu Jingwen,Zhang Wanchang,Sun Chengwu,et al. An efficient method on deriving topographic index from dem for land surface hydrological model simulations[J]. Acta meteorologica sinica,2009,23(5):609-616. |
| APA | Xu Jingwen,Zhang Wanchang,Sun Chengwu,&Fu Congbin.(2009).An efficient method on deriving topographic index from dem for land surface hydrological model simulations.Acta meteorologica sinica,23(5),609-616. |
| MLA | Xu Jingwen,et al."An efficient method on deriving topographic index from dem for land surface hydrological model simulations".Acta meteorologica sinica 23.5(2009):609-616. |
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来源：中国科学院大学
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