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lawrence

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About lawrence

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  1. I understand TUFLOW is widely used in the UK and Australia. Are there users in north america and asia? Is 2d modelling common in north america? I think HEC, MIKE and Infoworks widely used in other places. thanks,
  2. There are some guidances available on estimating the joint probability storm events occuring on combined systems (eg. main river and tributary have a joint probability of 2year to 100year). However once the joint probability on the storm event is decided, I am finding it difficult to decide on the coincidence of the time to peak as the catchments would have different time of concentration. Also because the smaller system(tributary) could peak earlier in relation to the larger system (main river) leading to a two peak scenario thereby resulting in a short duration peak water levels which may not be the worst case flooding situation in the catchment. Should we manage to forcefit the peaks to occur at the same time on both systems which could be unrealistic (eg. worst case approach) or left to appropriate time to peak for the individual systems? Any guidance for best practice approach or previous experiences on this topic will be really helpful. Thanks
  3. folks, anybody out there!!!! will be greatly appreciated if you someone cld let me know the ways for representing this scenario?!
  4. I am currently building a 1d-2d (ISIS-TuFLOW) linked model where i need to connect the 1d ISIS reservoir unit(floodplain) to the 2d domain. This is the case both upstream and downstream of the 2d domain. I have an option of adding an ISIS 'FP' or 'spill unit' to represent the floodplain section in 1D. But then for the 2D domain, can i use HTBDY followed by an SX drawn to the same width of the floodplain. Assuming the HTBDY has the same name as the 1D 'FP' or 'spill unit', it should be able to transfer flows either ways. Will greatly appreciate if someone could let me know the correct way of representing the floodplains in this case. A snapshot of the model layout as attached. Thanks
  5. Thanks Bill for the assistance. I have now intalled the lastest version and it works well. All results as expected. Thanks again. Cheers, Lawrence
  6. Hi, I processed the results of a stable model run using TUFLOW to GIS utility. I then imported the result through table import. Then i found that the flood level information in all the ZC grid point are 'zero' value. all the adjacent grid points gave correct Water Level. I used a 10m grid (zpt for every 5m). But the Results obtained using the TUFLOW to GIS did not pick the water level for the centre point(ZC). So far tried: 1. I therfore checked the 'Zpt data file' and there are no null values found. 2. installed the latest version of the utility(TUFLOW to GIS) and re-processed the results, but no success. 3. Finally used the result data with missing ZC water level, but interpolated to a grid with a 12m(slightly greater than 10m). this produced an interpolated grid with reasonable accuracy. BUT not quite sure if i can rely on the results. Anyone has experienced something like this? Any help would be much appreciated. FOR MORE INFO, I HAVE INCLUDED A SNAPSHOT OF THE TYPE OF RESULT DATA I AM TALKING ABOUT. regards Lawrence
  7. Is it possible to use more than one HQ automatic outflow boundary within a single 2d domain. I am experiencing problems having more than one. I am getting error message as 'Boundary does not select one or more 2D cells, Check line crosses cell cross-hairs'. I have checked and it is well snapped to the 2d boundary. Any advice would be much appreciated.
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