Changes between Version 123 and Version 124 of DevelopmentActivities/ORCHIDEE-DOFOCO
- Timestamp:
- 2017-06-20T14:05:50+02:00 (7 years ago)
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DevelopmentActivities/ORCHIDEE-DOFOCO
v123 v124 30 30 The computational cost of using diameter classes is negligible and when a reasonable low number of diameter classes is used, the memory cost remains very small as the dimensions of only two variables are increased. The number of diameter classes is the same for all PFTs and is set by the parameter '''NCIRC'''. ORCHIDEE-CN, ORCHIDEE-CNP, and ORCHIDEE-MICT are all coded and used for NCIRC = 1. ORCHIDEE-CAN and ORCHIDEE-CN-CAN are coded and tested for NCIRC = 3. Until further testing, three diameter classes are considered sufficient. 31 31 32 Given earlier choices in ORCHIDEE, we either need to define the boundaries of each diameter class or the diameter distribution. While developing the code, we considered the second approach the most flexible. To allow maximal flexibility, each diameter class needs to be defined separately by the variable '''CIRC_CLASS_DIST_0000X''', where X is the number of the diameter class. The smallest number presents the smallest diameter class. From literature it is known that a truncated exponential distribution is a good first guess: 32 Given earlier choices in ORCHIDEE, we either need to define the boundaries of each diameter class or the diameter distribution. While developing the code, we considered the second approach the most flexible. To allow maximal flexibility, each diameter class needs to be defined separately by the variable '''CIRC_CLASS_DIST_0000X''', where X is the number of the diameter class. The smallest number presents the smallest diameter class. From literature it is known that a truncated exponential distribution is a good first guess: 33 {{{ 33 34 CIRC_CLASS_DIST_00001=9 34 35 CIRC_CLASS_DIST_00002=3 35 36 CIRC_CLASS_DIST_00003=1 36 37 }}} 37 38 The above declaration implies that 9/13th of the trees will always be in the smallest diameter class, 3/13th will be in the medium class and 1 tree out of 13 will be in the largest diameter class. These ratios are kept throughout the simulations and the boundaries of the diameter classes are adjusted to respect this constraint. Consequently, an even-aged stand will be simulated with three diameter classes where the diameter of the first class may be, for example, 20.3 cm, the diameter of the second class 20.4 cm and the diameter of the third class 20.5 cm. The same code and set-up allows to simulate, in the same simulation, an uneven-aged stand for the same PFT but in a different pixel with, for example, the smallest diameter 7 cm, the medium diameter 25 cm and the largest diameter 45 cm. 38 39 … … 50 51 51 52 If you want to use IMPOSE_VEG=y then only vegetation should be added to the youngest age class. ORCHIDEE will update the vegetation fractions during the simulations 53 {{{ 52 54 SECHIBA_VEG_01=0.0769230769231 53 55 SECHIBA_VEG_02=0.0769230769231 … … 63 65 SECHIBA_VEGMAX_05=0.0 64 66 ... 65 67 }}} 66 68 Link PFTs to MTCs 69 {{{ 67 70 PFT_TO_MTC_01=1 68 71 PFT_TO_MTC_02=2 … … 71 74 PFT_TO_MTC_05=2 72 75 ... 76 }}} 73 77 74 78 Tell ORCHIDEE which PFTs have a successional relationship 79 {{{ 75 80 AGEC_GROUP_01=1 76 81 AGEC_GROUP_02=2 … … 79 84 AGEC_GROUP_05=2 80 85 ... 86 }}} 81 87 82 88 Give all PFTs a name for clarity 89 {{{ 83 90 PFT_NAME__01=Soilbare 84 91 PFT_NAME__02=Broadleavedevergreentropical_age01 … … 87 94 PFT_NAME__05=Broadleavedevergreentropical_age04 88 95 ... 89 90 91 96 }}} 92 97 93 98 === CWRR vs Choinell ===
