Modeling peatland hydrology and related elastic deformation

摘要: Reversible surface displacements occur at time scales of hours in peatlands that are subject to drying and rewetting cycles. This phenomenon is related the long term subsidence caused by biological oxidation organic matter under aerobic conditions peat drainage for agricultural purposes induces temperate regions. Modeling land peatland requires, a preliminary stage, separation between elastic deformation water table soil moisture changes irreversible sinking due oxidation. In this paper hydrology modeled together with one-dimensional column fluctuations precipitation, evapotranspiration, drainage. The test case representative field bog located south Venice (Italy), where hydrologic displacement data have been continuously recorded since November 2001. A linear, pattern swelling/shrinkage relating gravimetric content implemented coupling variably saturated finite element flow model volume change equation. study ignored, scale being much less than process. comparison numerical results large dataset available from monitoring site allows calibration hydraulic mechanical parameters assesses validity proposed model.