DAYTRANS model

DAYTRANS is a process-level compartment simulation model that uses climatic, edaphic, and stand data to estimate transpiration, soil moisture depletion, and water stress development in a forest stand.

process-levelclimaticedaphictranspirationsoil moisture depletionwater stressforest

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Initial contribute: 2020-01-04

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Quoted fromDocumentation and Preliminary Validation of H20TRANS and DAYTRANS, Two Models for Predicting Transpiration and Water Stress in Western Coniferous Forestshttps://books.google.ru/books?id=_p1sXRV3D3QC&pg=PA18&lpg=PA18&dq=H2OTRANS+model&source=bl&ots=RcatxV7zj2&sig=ACfU3U2dVz14b-hgGzDbQ_KChOv2yk67wA&hl=en&sa=X&ved=2ahUKEwiXyayuqYHuAhXjkcMKHSUhAJoQ6AEwAHoECAIQAg#v=onepage&q&f=false 

      H2OTRANS and DAYTRANS are two process-level compartment simulation models that use climatic, edaphic, and stand data to estimate transpiration, soil moisture depletion, and water stress development in a forest stand. The primary difference between the two models is that H2OTRANS runs on hourly input climatic data while DAYTRANS only requires daily average in-puts of climatic data. The most significant outputs from the models are soil moisture depletion, stand transpiration, leaf conductance, and leaf water potential. Compartment diagrams with flow linkages are illustrated in figures 1 and 2.

      Both models were constructed using a general simulation processor similar to the FLEX/REFLEX system developed in the IBP Coniferous Forest Biome by Whiteand Overton (1977) for large-scale ecosystem models. Application of the FLEX modeling format also can be found in the description of the CONIFER model of theU.S.IBP Coniferous Forest Biome (CFBMG 1979,Swart-zman 1979]. The processor assigns all parameters a subscripted variable so that changes in the model can be made easily. State variables or compartments are designated as X(i). The change in X(i) from (t) to (t+ 1) is I(i).The flow between state variables is designated F(i. j). where material flows from X(i) to X(j). Driving variables, which typically input climatic variables in ecological models, are Z(i). Constant parameters used in the model are B(i). Finally, intermediate variables used to compute the functions controlling flow in the model are G(i). Other variable notations are given in appendix 1.

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DAYTRNAS team (2020). DAYTRANS model, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/d26faeae-d179-47bb-834a-c222b6fc126c
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zhangshuo
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2021-01-11
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Initial contribute : 2020-01-04

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zhangshuo
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