PROGRESS IN GEOGRAPHY ›› 2011, Vol. 30 ›› Issue (1): 80-86.doi: 10.11820/dlkxjz.2011.01.010

• Original Articles • Previous Articles     Next Articles

Response of Simulated Stream Flow to Soil Data Spatial Detail across Different Routing Areas

LI Runkui1,2, ZHU A-Xing1,3, LI Baolin1, PEI Tao1, QIN Chengzhi1   

  1. 1. State Key Lab. of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Graduate University of Chinese Academy of Sciences, CAS, Beijing 100049, China;
    3. Department of Geography, University ofWisconsin-Madison, Madison, WI 53706, USA
  • Received:2010-03-01 Revised:2010-11-01 Online:2011-01-25 Published:2011-01-25

Abstract: Appropriate spatial detail of input data for watershed modeling is partly dependent on the scale of the watershed modeled. It will facilitate data selection for modeling if the effect of watershed scale can be quantitatively described. This paper aims at investigating the variations of simulated differences between different soil data across a series of water routing areas. The study was conducted using soil and water assessment tool, with the 1:24,000 SSURGO soil data and digital soil mapping data from Soil Land Inference Model (SoLIM) at 10m resolution as different input data, to investigate the stream flow differences arising from different soil data at Brewery Creek, Dane county, Wisconsin of the USA. Results show the low consistency of simulated stream flow between the two soil data at small water routing areas, but the consistency generally rises with the increase of routing area. Simulated stream flow based on SSURGO and SoLIM becomes similar especially for area larger than 10 km2. Based on the effects of continuous routing scales on simulated stream flow differences between different soil data, a preliminary conclusion can be made that coarser input data can also be used for a larger watershed for stream flow simulation.

Key words: input data resolution, modeling effects, stream flow simulation, SWAT model, watershed scale