OBSERVATIONS

      Vast Mini Challenge 2: Like a Duck to Water

Overview

Data Preparation

Observations

Conclusion

Trend Analysis

1. Inconsistent Data Collection

The data is collected from 1998 – 2016 in various locations of the preserve. However, it is noted that readings of many chemical indicators were not collected for the early years. Also, reading from sensors in Achara, Decha, Tansasee were collected only after 2009. There is an inconsistent data collection pattern observed as the number of records in 2006 and 2007 is higher compared to other years. It is found that number of records collected in Boonsri and Chai resulted in 2006 and 2007 contributed to the overall increase in the records.

2. Cyclic Trend

The water temperature and total dissolved O2 shows cyclic pattern over the years. It is also found that they both share a negative relationship; trend shows that increase in water temperature decrease total dissolved O2 value for the given period. The water temperature shows downward trend from October to March whereas total dissolved oxygen shows upward trend during the same time period. April to September is the period when there is increase in water temperature and is seen as an upward trend in the graph.

3. Sudden drop in total hardness

The total hardness reading is collected from 2005. The median value from 2005 to 2016 is 139 mg / l. However, it is found that the hardness value dropped below 5 mg / l in 2011 and this pattern continued in 2012 as well. There is no data collected for the year 2013. There is an increasing trend from year 2014 to 2016 where readings are higher compared to previous 6 years records.