RIVER RESTORATIONS IMPACT ON THE DIURNAL AND SEASONAL CHANGES IN RIVER WATER QUALITY IN THE THUR CATCHMENT
The importance of river restoration projects can only be realized upon evaluating their success or failure in a region mainly with regards to water quality, ecological adaptations and flood mitigation. The lack of temporal data in many restoration projects demand a spatial analysis of water quality parameters between the restored and unrestored parts of the river. Further, in large catchments there is a lack of water quality data in high frequency which are needed for the understanding of stream biogeochemical processes. In this study these challenges are addressed by collecting high frequency data (15 minutes) of several water quality parameters to observe the diurnal and seasonal changes in water quality across a river reach. The pre-alpine Thur catchment in North eastern Switzerland with an average yearly discharge of 52 m3/s is the chosen study area. A 2 km restored stretch in the downstream part of the river with natural meanders and gravel deposits is the focus of this study. In comparison to the upstream and downstream stretches, the restored section seems to have a major influence on the different parameters thus demonstrating the increased hyporheic exchange and biological activity in this section.
River restoration Large pre-alpine catchment Diurnal oscillations Surface water quality
Vidhya Chittoor Viswanathan Mario Schirmer
EAWAG, Water Resources and Drinking Water, CH-8600 Duebendorf, Switzerland;Université de Neuchatel, Centre d‘Hydrogéologie, Rue Emile-Argand 11, CH- 2000 Neuchatel, Switzerland
国际会议
The 3rd Biennial ISRS Symposium Achieving Healthy and Viable Rivers (ISRS)第3届国际河流大会
北京
英文
429-436
2013-08-05（万方平台首次上网日期，不代表论文的发表时间）