Assessment of Runoff and Sediment Yields Using the AnnAGNPS Model in a Three-Gorge Watershed of China

Lizhong Hua, Xiubin He, Yongping Yuan and Hongwei Nan
Additional contact information
Lizhong Hua: Department of Spatial Information Science and Engineering, Xiamen University of Technology, Xiamen 361021, China
Xiubin He: Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
Yongping Yuan: USEPA-Office of Research and Development, 944 E. Harmon Ave, Las Vegas, NV 89119, USA
Hongwei Nan: Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China

IJERPH, 2012, vol. 9, issue 5, 1-21

Abstract: Soil erosion has been recognized as one of the major threats to our environment and water quality worldwide, especially in China. To mitigate nonpoint source water quality problems caused by soil erosion, best management practices (BMPs) and/or conservation programs have been adopted. Watershed models, such as the Annualized Agricultural Non-Point Source Pollutant Loading model (AnnAGNPS), have been developed to aid in the evaluation of watershed response to watershed management practices. The model has been applied worldwide and proven to be a very effective tool in identifying the critical areas which had serious erosion, and in aiding in decision-making processes for adopting BMPs and/or conservation programs so that cost/benefit can be maximized and non-point source pollution control can be achieved in the most efficient way. The main goal of this study was to assess the characteristics of soil erosion, sediment and sediment delivery of a watershed so that effective conservation measures can be implemented. To achieve the overall objective of this study, all necessary data for the 4,184 km 2 Daning River watershed in the Three-Gorge region of the Yangtze River of China were assembled. The model was calibrated using observed monthly runoff from 1998 to 1999 (Nash-Sutcliffe coefficient of efficiency of 0.94 and R 2 of 0.94) and validated using the observed monthly runoff from 2003 to 2005 (Nash-Sutcliffe coefficient of efficiency of 0.93 and R 2 of 0.93). Additionally, the model was validated using annual average sediment of 2000–2002 (relative error of ?0.34) and 2003–2004 (relative error of 0.18) at Wuxi station. Post validation simulation showed that approximately 48% of the watershed was under the soil loss tolerance released by the Ministry of Water Resources of China (500 t·km ?2 ·y ?1 ). However, 8% of the watershed had soil erosion of exceeding 5,000 t·km ?2 ·y ?1 . Sloping areas and low coverage areas are the main source of soil loss in the watershed.

Keywords: AnnAGNPS; modeling; Daning River watershed; Three-Gorge; erosion and sediment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2012
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1660-4601/9/5/1887/pdf (application/pdf)
https://www.mdpi.com/1660-4601/9/5/1887/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:9:y:2012:i:5:p:1887-1907:d:17788

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().