Daily streamflow modelling and assessment based on the curve‐number technique

A cell-based long-term hydrological model (CELTHYM) that can be integrated with a geographical information system (GIS) was developed to predict continuous stream flow from small agricultural watersheds. The CELTHYM uses a cell-by-cell soil moisture balance approach. For surface runoff estimation, the curve number technique considering soil moisture on a daily basis was used, and release rate was used to estimate baseflow. Evapotranspiration was computed using the FAO modified Penman equation that considered land-use-based crop coefficients, soil moisture and the influence of topography on radiation. A rice paddy field water budget model was also adapted for the specific application of the model to East Asia. Model sensitivity analysis was conducted to obtain operational information about the model calibration parameters. The CELTHYM was calibrated and verified with measured runoff data from the WS#1 and WS#3 watersheds of the Seoul National University, Department of Agricultural Engineering, in Hwaseong County, Kyounggi Province, South Korea. The WS#1 watershed is comprised of about 35·4% rice paddy fields and 42·3% forest, whereas the WS#3 watershed is about 85·0% forest and 11·5% rice paddy fields. The CELTHYM was calibrated for the parameter release rate, K, and soil moisture storage coefficient, STC, and results were compared with the measured runoff data for 1986. The validation results for WS#1 considering all daily stream flow were poor with R2, E2 and RMSE having values of 0·40, −6·63 and 9·69 (mm), respectively, but validation results for days without rainfall were statistically significant (R2 = 0·66). Results for WS#3 showed good agreement with observed data for all days, and R2, E2 and RMSE were 0·92, 0·91 and 2·23 (mm), respectively, suggesting potential for CELTHYM application to other watersheds. The direct runoff and water balance components for watershed WS#1 with significant areas of paddy fields did not perform well, suggesting that additional study of these components is needed. Copyright © 2002 John Wiley & Sons, Ltd.

[1]  J. L. Kittle,et al.  Hydrological simulation program: Fortran. User's manual for release 10 , 1993 .

[2]  Wesley P. James,et al.  Hydrologic Parameter Estimation Using Geographic Information System , 1992 .

[3]  R. E. Rallison,et al.  Past, present, and future SCS runoff procedure , 1982 .

[4]  Jens Christian Refsgaard,et al.  Application of the SHE to catchments in India Part 2. Field experiments and simulation studies with the SHE on the Kolar subcatchment of the Narmada River , 1992 .

[5]  M. Kujawa,et al.  FAO Plant Production and Protection Paper. Pesticide Residues in Food — 1977, Evaluations 1977. 459 Seiten. Food and Agriculture Organization of the United Nations, Rome 1978. Preis: 9,90 $ , 1980 .

[6]  John R. Williams,et al.  LARGE AREA HYDROLOGIC MODELING AND ASSESSMENT PART I: MODEL DEVELOPMENT 1 , 1998 .

[7]  K. Beven,et al.  A physically based, variable contributing area model of basin hydrology , 1979 .

[8]  V. Ponce,et al.  Runoff Curve Number: Has It Reached Maturity? , 1996 .

[9]  B. Bhaduri,et al.  Assessing Watershed-Scale, Long-Term Hydrologic Impacts of Land-Use Change Using a GIS-NPS Model , 2000, Environmental management.

[10]  J. Nash,et al.  River flow forecasting through conceptual models part I — A discussion of principles☆ , 1970 .

[11]  N. Crawford,et al.  DIGITAL SIMULATION IN HYDROLOGY' STANFORD WATERSHED MODEL 4 , 1966 .

[12]  P. E. O'connell,et al.  An introduction to the European Hydrological System — Systeme Hydrologique Europeen, “SHE”, 2: Structure of a physically-based, distributed modelling system , 1986 .

[13]  P. E. O'connell,et al.  An introduction to the European Hydrological System — Systeme Hydrologique Europeen, “SHE”, 1: History and philosophy of a physically-based, distributed modelling system , 1986 .

[14]  J. Harbor.  A Practical Method for Estimating the Impact of Land-Use Change on Surface Runoff, Groundwater Recharge and Wetland Hydrology , 1994 .

[15]  James C. Bathurst,et al.  Physically-based distributed modelling of an upland catchment using the Systeme Hydrologique Europeen , 1986 .

[16]  B. Bhaduri,et al.  A geographic information system-based model of the long-term impact of land use change on nonpoint-source pollution at a watershed scale , 1998 .

[17]  L. F. Huggins,et al.  ANSWERS: A Model for Watershed Planning , 1980 .

[18]  Marvin E. Jensen,et al.  Design and Operation of Farm Irrigation Systems , 1980 .

[19]  Stephen R. Workman,et al.  SIMULATION OF DAILY AND MONTHLY STREAM DISCHARGE FROM SMALL WATERSHEDS USING THE SWAT MODEL , 2000 .

[20]  K. Beven,et al.  Testing a physically-based flood forecasting model (TOPMODEL) for three U.K. catchments , 1984 .