Calibration and validation of DRAINMOD to model bioretention hydrology

摘要: Summary Previous field studies have shown that the hydrologic performance of bioretention cells varies greatly because factors such as underlying soil type, physiographic region, drainage configuration, surface storage volume, area to ratio, and media depth. To more accurately describe response, a long-term model generates water balance is needed. Some current models lack ability perform simulations others never been calibrated from monitored with underdrains. All peer-reviewed simultaneously both following functions: (1) an internal (IWS) zone configuration (2) account for soil–water content using characteristic curve. DRAINMOD, widely-accepted agricultural model, was used simulate response runoff entering cell. The concepts movement in are very similar those fields pipes, so many design specifications corresponded directly DRAINMOD inputs. Detailed measurements were collected two sites Nashville Rocky Mount, North Carolina, calibrate test model. Each site had sets varying depths, types, configurations, volumes. After 12 months, one these characteristics altered – volume at IWS depth Mount. At Nashville, during second year (post-repair period), Nash–Sutcliffe coefficients exfiltration/evapotranspiration (ET) exceeded 0.8 calibration validation periods. During first (pre-repair drainage, overflow, exfiltration/ET ranged 0.6 0.9 Mount included zone. For periods, modeled within 1% 5% estimated sand (Sand cell) sandy clay loam (SCL soils, respectively. SCL cell periods 0.92.