Temporary streams in a peatland catchment: pattern, timing, and controls on stream network expansion and contraction

摘要: In peatlands, poorly maintained baseflows mean that network expansion during storm events can be rapid and pronounced, resulting in large changes catchment connectivity. This has implications for the timing magnitude of material fluxes from these environments, understanding which is becoming increasingly important due to peatlands' significance as global carbon stores. this study, electrical resistance (ER) technology been used create sensors capable detecting presence absence flow ephemeral portions channel network. These provide data on patterns variation Upper North Grain research catchment, a small peatland headwater South Pennines, UK. Networks around 40 were deployed autumn 2007 summer 2008, giving total almost four months high-resolution monitoring data. Drainage density was found vary between 1.4 30.0�€‰km/km2, suggesting significant differences connectivity expanded contracted networks. Water table depth identified key factor determining temporal pattern streamflow at both site- catchment-wide scales. Spatially, contraction occurred disjointed manner, following similar events, localized controls are generation. Spatial generation relate local water levels, include drainage area, dissection, slope gully morphology. The importance control suggests potential future change tables, associated with projected climate or restoration by rewetting, will modify frequency full