| Abstract: | The patterns of temporal variations of precipitation (P), streamflow (SF) and baseflow (BF) as well as their nitrate-nitrogen (nitrate) concentrations (C) and loads (L) from a long-term record (28 years) in the Raccoon River, Iowa, were analyzed using variogram and spectral analyses. The daily P is random but scaling may exist in the daily SF and BF with a possible break point in the scaling at about 18 days and 45 days, respectively. The nitrate concentrations and loads are shown to have a half-year cycle while daily P, SF, and BF have a one-year cycle. Furthermore, there may be a low-frequency cycle of 6-8 years in C. The power spectra of C and L in both SF and BF exhibit fractal 1/f scaling with two characteristic frequencies of half-year and one-year, and are fitted well with the spectrum of the gamma distribution. The nitrate input to SF and BF at the Raccoon watershed seems likely to be a white noise process superimposed on another process with a half-year and one-year cycle. ?? 2005 Elsevier Ltd. All rights reserved. |
| Genre: | Article |
| ProdID: | 70029316 |
| Citation Author: | Zhang, Y. -K.; Schilling, K. |
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| Citation End Page: | 710 |
| Citation Issue: | 7 |
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| Citation Language: | English |
| Citation Larger Work Title: | Advances in Water Resources |
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| Citation Number Of Pages: | 10 |
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| Citation Search Results Text: | Temporal variations and scaling of streamflow and baseflow and their nitrate-nitrogen concentrations and loads; 2005; Article; Journal; Advances in Water Resources; Zhang, Y. -K.; Schilling, K. |
| Citation Start Page: | 701 |
| Citation Volume: | 28 |
| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | Temporal variations and scaling of streamflow and baseflow and their nitrate-nitrogen concentrations and loads; 2005; Article; Journal; Advances in Water Resources; Zhang, Y. -K.; Schilling, K. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/j.advwatres.2004.12.014 |
| Date Other: | Sat, 1 Jan 2005 00:00 -0600 |
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