[Back]

I. Schnauder, C. Anlanger:
"River Mulde, Germany - Transient storage of wake flows induced by large woody debris";
Talk: 6th biennial Symposium of the International Society for River Science (ISRS), Wien; 2019-09-08 - 2019-09-13; in: "Riverine landscapes as coupled socio-ecological system", (2019), 1 pages.

Transient storage is an important process in rivers. It's a major contributor to the transport and retention dynamics of sediments and matter and thus the biological and physico-chemical productivity of rivers. Transient storage exists in a variety of types and across different spatial and temporal scales - from hyporheic flow to large flow recirculations in river bends or bank cavities (review in Schiemer & Hein, 2007). At intermediate scales, large woody debris (LWD) has been recognised as important transient storage (review in Jackson et al. 2013). This coincides with river restoration practice, where LWD has become increasingly important to achieve the goals of the EU water framework directive (EU-WFD). One example is river Mulde, a tributary of Elbe in central Germany. Hereby, the main research challenge lies in an appropriate structural parameterisation of LWD. It determines the induced flow and turbulence structure of the near and far wake and thus the storage efficiency. While fundamental research on wake flows focused on idealised cylindrical objects, which may hold for simpler configurations of LWD, we still lack a generalised concept for most LWD real-world cases. Our contribution gives an overview of real-world cases, including river Mulde, and reviews approaches to parameterise the geometric structure and wake properties of LWD with regard to transient storage.

transient storage, large wood, wake flow, dispersion