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Utvärdering av grumlighet i miljökontrollprogram för ytvatten vid konstruktionsarbeten
| Content Provider | Semantic Scholar |
|---|---|
| Author | Anna, Sporre |
| Copyright Year | 2015 |
| Abstract | It has been noticed that construction activities close to watercourses often result in turbidity values that exceed guideline values. A detailed analysis of annual reports from the Swedish infrastructure project “BanaVag i Vast” has shown that recommended values of turbidity often are determined without consideration of natural variations in turbidity. The performance probably depends on the lack of appropriate legislation on acceptable turbidity values and on how turbidity should be monitored during construction activities. The objective of this thesis was therefore to develop a method to determine background values for turbidity as a basis for setting water system adapted reference values. In the thesis a model for turbidity was developed with agricultural area, clay content within the watershed and discharge as input variables. With the dynamic model variations in turbidity could best be explained in watercourses of watersheds less than 100 km2, but even for these watercourses the model performance remained poor. For watercourses draining larger watersheds the model performance became even poorer, most probably due to complex interactions of a variety of driving variables, of which some were not included as input variables. A recommendation is therefore a national initiative where more advanced models can be used, at least for large watercourses that are highly vulnerable, after adaption to Swedish conditions. This study clearly shows that there is an urgent need in Sweden to improve methods to monitor turbidity as well as to improve guideline values by adjusting them according to background turbidity levels. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.diva-portal.org/smash/get/diva2:856510/FULLTEXT01.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
