The aim of this thesis was to determine whether there has been a trend of increasing or decreasing water colour, absorbance, in Lake Mälaren during the last 35 years and whether it could be correlated with water discharge. The discharge was accounted for using regression analysis. The data material was analyzed for trends using a nonparametric test, the so-called seasonal Mann- Kendall test. The regression model could only account for a small…
Contents
1 INTRODUCTION
1.1 CHARACTERISTICS OF LAKE MÄLAREN CATCHMENT AREA
2 METHODS
2.1 DATA
2.1.1 Limitations
2.2 WATER COLOUR CLASSIFICATION
2.3 STATISTICAL EVALUATION
2.3.1 Relationship between absorbance at different depths
2.3.2 Accounting for the influence of discharge on absorbance
2.3.3 Trend analysis
3 RESULTS
3.1 CLASSIFICATION OF WATER COLOUR
3.2 CHARACTERISTICS OF DATA
3.2.1 Time series of absorbance
3.2.2 Time series of discharge
3.2.3 Seasonal variation in absorbance
3.2.4 Relationship between precipitation and absorbance
3.3 RELATIONSHIP BETWEEN DEPTHS
3.4 ACCOUNTING FOR THE INFLUENCE OF DISCHARGE ON ABSORBANCE
3.5 TREND ANALYSIS
3.5.1 Trend over the whole year
3.5.2 Trends during individual months
4 DISCUSSION
4.1 WATER COLOUR CLASSIFICATION
4.2 TREND ANALYSIS
4.3 SEASONAL VARIATION
4.4 INFLUENCE OF WATER DISCHARGE ON ABSORBANCE
4.5 CLIMATIC VARIATION
4.6 FURTHER RESEARCH
5 CONCLUSION
6 REFERENCES
Author: Tilja, Marie
Source: Linköping University
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