WEBVTT 00:21.760 --> 00:24.329 Hello , I am Paul Schroder . I'm a 00:24.340 --> 00:25.870 research civil engineer in 00:25.879 --> 00:28.219 environmental lab at DIC . Today , I'm 00:28.229 --> 00:30.760 going to talk about the PSDDF model . 00:30.770 --> 00:32.900 PS CD F stands for primary 00:32.909 --> 00:35.299 consolidation , secondary compression 00:35.770 --> 00:39.150 and desiccation of dredge fill . PSDDF 00:39.159 --> 00:41.590 is a model for predicting long term 00:41.599 --> 00:44.790 storage for numerous different 00:44.799 --> 00:47.080 applications . In particular , it's 00:47.090 --> 00:49.659 used for confined disposal facilities . 00:49.669 --> 00:52.069 In order to predict the elevation of 00:52.080 --> 00:54.349 the dredge fill as a function of time 00:54.459 --> 00:56.770 for multiple disposal operations . The 00:56.779 --> 00:58.946 dredge fill when place you know , will 00:58.946 --> 01:01.080 consolidate and desiccate the storage 01:01.090 --> 01:04.379 capacity will be changing continuously 01:04.389 --> 01:06.611 throughout the disposal operation . The 01:06.611 --> 01:09.660 program will predict the elevation as a 01:09.669 --> 01:12.489 function of time to aid in determining 01:12.500 --> 01:15.309 when uh raising of diets would be 01:15.319 --> 01:17.597 needed . In order to gain new capacity . 01:17.680 --> 01:21.239 PSDEF requires a variety of data to to 01:21.250 --> 01:24.720 run . As shown here is the uh gooey 01:24.730 --> 01:28.620 for PSDDF and shows you 01:28.629 --> 01:30.919 that you need a description of your 01:30.930 --> 01:33.309 foundation materials , your dredge fill 01:33.319 --> 01:35.599 materials that you're placing uh 01:35.610 --> 01:37.889 description of the operation when 01:37.900 --> 01:40.559 you're placing it and properties of the 01:40.889 --> 01:42.889 dredge fill in terms of how it will 01:42.889 --> 01:45.056 desiccate how thick the crust might be 01:45.056 --> 01:48.639 formed and and so on . In order to make 01:48.650 --> 01:50.483 its prediction of elevation as a 01:50.483 --> 01:54.449 function of time shown here is the plot 01:54.459 --> 01:56.459 of surface elevation for a confined 01:56.459 --> 01:59.430 disposal site with multiple placements 01:59.440 --> 02:01.440 or or risks of dredge material over 02:01.440 --> 02:04.769 time . So initially , you know , six 02:05.900 --> 02:08.580 and a half feet roughly or uh dredge 02:08.589 --> 02:10.800 material was placed in here . It then 02:10.809 --> 02:13.559 was allowed to desiccate and and 02:13.570 --> 02:15.681 consolidate before the next placement 02:15.681 --> 02:17.848 at which point in time , another whiff 02:17.848 --> 02:20.369 was placed of approximately 6 ft and 02:20.380 --> 02:22.119 again allowed to consolidate 02:24.149 --> 02:26.427 and then an additional lift , you know , 02:26.427 --> 02:28.839 subsequently the program here , you 02:28.850 --> 02:31.139 know , can show you , you know what is 02:31.149 --> 02:33.160 the benefit of resting in its sight 02:33.169 --> 02:35.520 longer . And what we see here is that 02:35.910 --> 02:39.660 in a matter of 2 to 3 years , 02:40.050 --> 02:42.300 we have achieved as much basically 02:42.309 --> 02:44.710 desiccation and consolidation as we're 02:44.940 --> 02:47.720 as we're likely to receive . And , and 02:47.729 --> 02:49.840 so we could actually place a lift and 02:49.840 --> 02:52.289 basically after every , you know , two 02:52.300 --> 02:54.369 or three years and gain the maximum 02:54.380 --> 02:56.602 storage capacity over the site over the 02:56.602 --> 02:58.940 long term . So it can help you define 02:59.119 --> 03:01.630 your operation in terms of what spacing 03:01.639 --> 03:05.520 you should u use in terms of placing in , 03:05.529 --> 03:07.585 in , in uh material in the site , in 03:07.585 --> 03:09.899 order to gain its maximum storage 03:09.910 --> 03:13.830 capacity , dic 03:14.529 --> 03:17.479 discovering , developing and delivering 03:17.490 --> 03:19.546 new ways to make the world safer and 03:19.546 --> 03:21.039 better every day .