WEBVTT 00:22.420 --> 00:24.719 Hello , I'm Paul Schroder . I work in 00:24.729 --> 00:26.951 the environmental engineering branch of 00:26.951 --> 00:29.007 the environmental laboratory here at 00:29.007 --> 00:31.309 DIC . Today , I'm going to talk about 00:31.319 --> 00:35.150 the CD fate model CD . Fate stands for 00:35.159 --> 00:37.048 fate of a continuous discharge of 00:37.048 --> 00:38.937 dredge material in open water for 00:38.937 --> 00:42.630 predicting water quality effects . CD 00:42.750 --> 00:44.694 eight covers a variety of dredging 00:44.694 --> 00:47.680 operations in the upper left corner . 00:47.689 --> 00:49.709 You can see a pipeline disposal 00:49.720 --> 00:51.831 operation of dredged material in open 00:51.831 --> 00:54.053 water . In the upper right corner , you 00:54.053 --> 00:56.909 can see a confined disposal facility in 00:56.919 --> 00:59.340 the near shore where discharges are 00:59.349 --> 01:01.516 actually released by filtering through 01:01.516 --> 01:04.400 the dives in the lower left corner . 01:04.599 --> 01:07.750 You , you see pipeline discharges from 01:07.760 --> 01:10.629 the CD F . And similarly , you can see 01:10.639 --> 01:12.800 this in the lower right corner where 01:12.809 --> 01:15.209 you can see the plume coming from the 01:15.220 --> 01:17.760 discharge . Additionally , it covers 01:17.769 --> 01:19.989 the releases of overflow from hopper 01:20.000 --> 01:23.779 dredges . CD fade is 01:23.790 --> 01:26.639 used to compute required mixing song 01:27.410 --> 01:29.309 and our dilutions for dredging 01:29.319 --> 01:33.279 operations be a CD F effluence . Hopper 01:33.290 --> 01:35.440 overflows or pipeline discharges or 01:35.449 --> 01:38.050 dredge material . And it's used for 01:38.059 --> 01:40.610 compliance purposes for the Clean Water 01:40.620 --> 01:43.529 Act 401 water Quality certification . 01:45.639 --> 01:48.139 The program simulates jet dynamics and 01:48.150 --> 01:50.860 train of initial discharge density 01:50.870 --> 01:54.029 driven spreading , passive transport 01:54.800 --> 01:57.669 and turbulent diffusion for suspended 01:57.680 --> 02:01.330 solids and contaminants . The 02:01.339 --> 02:03.919 program is used in the short term . It , 02:03.930 --> 02:06.097 it , it simulates a couple of hours of 02:06.097 --> 02:08.263 plum transport over a few kilometers . 02:09.380 --> 02:11.839 The model is based on the U SEPA Coric 02:12.210 --> 02:14.740 modeling system . There are other 02:14.750 --> 02:17.820 models available for looking at 02:17.830 --> 02:20.750 transport beyond suspended solids and 02:20.759 --> 02:24.630 contaminants . The DIF CD model can 02:24.639 --> 02:26.528 be used to look at the deposition 02:26.528 --> 02:28.639 associated with pipeline discharges . 02:28.970 --> 02:32.229 The particle tracking model PTM is look 02:32.240 --> 02:34.880 is used for longer simulations and look 02:34.889 --> 02:38.490 at sedimentation and resuspension as 02:38.500 --> 02:42.149 well as just the transport Decor mix 02:42.880 --> 02:45.039 was developed for just looking at 02:45.050 --> 02:47.100 pipeline discharges but it included 02:47.110 --> 02:50.250 sedimentation . This slide shows the 02:50.259 --> 02:52.679 interface for the CD fate model . 02:54.539 --> 02:57.520 There are four sets of data required 02:57.529 --> 03:00.399 for the model discharge conditions , 03:00.419 --> 03:03.399 receiving water data , effluent density 03:03.410 --> 03:05.466 and and modeling parameters and then 03:05.466 --> 03:07.479 mixing zone data . There are six 03:07.490 --> 03:09.800 different discharge cases that can be 03:09.809 --> 03:11.979 evaluated . There are three cases 03:11.990 --> 03:15.660 associated with CD F discharges . The 03:15.669 --> 03:18.300 first case showing in the upper left is 03:18.309 --> 03:21.690 discharged from the CD F via a a stream 03:21.699 --> 03:24.520 or creek feeding back into the water 03:24.529 --> 03:28.020 body . The schematic shows the data 03:28.029 --> 03:32.009 requirements . The second case shown on 03:32.020 --> 03:34.800 the upper right is a discharge directly 03:34.809 --> 03:38.289 to the water body from a pipeline . 03:38.550 --> 03:42.369 Again , it gives you a schematic as to 03:42.380 --> 03:44.809 how to interpret the data needs . You 03:44.820 --> 03:46.931 know , the height above the water for 03:46.931 --> 03:48.931 discharge or slope of the receiving 03:48.931 --> 03:51.098 water and so forth . The third case is 03:51.098 --> 03:53.500 for discharge through the dives . In 03:53.509 --> 03:55.979 this case , the , it could be an island 03:55.990 --> 03:59.080 CD F or a near shore CD F that is built 03:59.089 --> 04:01.399 into the water body . In this case , 04:01.410 --> 04:04.860 the , the effluent discharges from the 04:04.869 --> 04:08.619 dykes as a , so as a filter cell and , 04:08.970 --> 04:11.789 and so it , it leaves the facilities a 04:11.800 --> 04:15.619 as in a manner that's represented by a 04:15.630 --> 04:18.598 submerged diffuser . So the data 04:18.609 --> 04:20.759 requirements again are shown in the 04:20.769 --> 04:24.079 schematics and to help you interpret 04:24.088 --> 04:27.579 what data needs , you have . The second 04:27.589 --> 04:30.179 set of cases deal with dredge 04:30.190 --> 04:33.209 discharges . In this case , in the 04:33.220 --> 04:34.970 upper left corner is shown the 04:34.980 --> 04:37.929 discharge directly from a dredge into 04:37.940 --> 04:41.209 the water body . In this case , we're 04:41.299 --> 04:43.709 pumping a slurry of dredge material , 04:43.720 --> 04:46.609 unlike the discharges from the CD F 04:46.619 --> 04:48.452 which would be clarified water . 04:50.510 --> 04:54.450 Again , the schematic shows you the 04:54.459 --> 04:56.619 information needed to describe the 04:56.630 --> 05:00.350 circumstances of this discharge . The 05:00.850 --> 05:04.679 second uh discharge case is 05:04.690 --> 05:06.801 showing in the upper right corner and 05:06.801 --> 05:08.579 this is a hopper dredge that is 05:08.579 --> 05:11.109 allowing overflow across a weir . 05:12.880 --> 05:15.690 In this case , the its model as a a 05:15.910 --> 05:19.549 diffuser release of of again , the 05:19.559 --> 05:21.640 overflow which could be uh 05:22.709 --> 05:25.200 containing high concentrations of 05:25.209 --> 05:28.730 solids are are simple clear water . 05:28.980 --> 05:32.209 And , and again , the schematic shows 05:32.220 --> 05:34.459 you the information that you need to 05:34.470 --> 05:36.859 provide . Uh to describe the case . 05:39.459 --> 05:43.130 The third case is 05:43.329 --> 05:46.079 a pipeline discharge such as from a 05:46.089 --> 05:49.079 cutter head dredge . In this case , the 05:49.089 --> 05:52.920 the model assumes the 05:52.929 --> 05:56.049 discharge will flow out as a jet 05:56.059 --> 05:58.720 through the water column and then land 05:58.730 --> 06:01.008 on the bottom and spread on the bottom . 06:01.329 --> 06:04.779 The model models this as both a jet 06:04.989 --> 06:07.869 and as a diffuse case from the bottom . 06:08.579 --> 06:10.635 In which case , now , it's necessary 06:10.635 --> 06:12.857 again to describe the , the environment 06:12.857 --> 06:15.239 in which the jet is released as well as 06:15.250 --> 06:17.720 then the footprint of the of the 06:17.730 --> 06:20.470 spreading dredge material . Again , the 06:20.480 --> 06:22.980 schematic helps in in aiding you and 06:22.989 --> 06:25.369 providing the data required . 06:27.429 --> 06:30.529 The additional three sets of inputs are 06:30.540 --> 06:33.410 shown on this slide . They consist of 06:33.420 --> 06:36.230 receiving water data , effluent density 06:36.239 --> 06:38.720 and model parameters and mixing zone 06:38.730 --> 06:42.260 data . The upper left 06:42.269 --> 06:45.260 shows the receiving water data and this 06:45.269 --> 06:49.260 is mainly related to velocities 06:49.500 --> 06:51.722 that you're discharging into the bottom 06:51.722 --> 06:53.889 roughness and the turbulence that will 06:53.889 --> 06:55.722 be occurring at the site and the 06:55.722 --> 06:57.600 proximity of boundaries to your 06:57.609 --> 07:01.209 discharge . The second set of data is 07:01.220 --> 07:02.887 effluent density and modeling 07:02.887 --> 07:04.942 parameters . This is helped describe 07:04.942 --> 07:07.140 the the dense nature of the discharge 07:07.149 --> 07:10.859 jet as with CD FS . You know , 07:10.869 --> 07:13.059 this would be representative of just 07:13.070 --> 07:15.179 normal water but for pipeline 07:15.190 --> 07:17.369 discharges or or pay or maybe hopper 07:17.440 --> 07:19.769 dredge overflows , this could be , you 07:19.779 --> 07:22.001 know , containing a considerable amount 07:22.001 --> 07:24.112 of solids in which you could describe 07:24.112 --> 07:26.112 the distribution of those solids as 07:26.112 --> 07:28.223 well to calculate the density of that 07:28.223 --> 07:32.200 discharge . Lastly is the mixing 07:32.209 --> 07:34.160 zone data . This is describing 07:34.670 --> 07:37.459 information related to the contaminants 07:37.470 --> 07:39.679 that you might be wanting to model or 07:39.690 --> 07:42.929 just total suspended solids . It 07:42.940 --> 07:46.799 requires the concentration that of the , 07:46.809 --> 07:48.865 of the contaminant in the background 07:48.865 --> 07:50.910 water or , or TSS , it would also 07:50.920 --> 07:53.750 require the concentration that you're 07:53.760 --> 07:56.660 trying to meet so that the program can 07:56.670 --> 08:00.260 then calculate when it can meet 08:00.269 --> 08:02.839 those uh criteria . 08:06.279 --> 08:08.529 Additionally , it , and ask you , you 08:08.540 --> 08:10.762 know , for some basic information as to 08:10.762 --> 08:13.489 how you want your mixing zone described . 08:13.500 --> 08:15.667 Do you want to describe as an area , a 08:15.667 --> 08:18.480 length or width ? And , and , and , and 08:18.489 --> 08:21.170 what is the maximum area you want to 08:21.179 --> 08:23.489 consider or length of the mixing zone ? 08:27.589 --> 08:30.869 The output from CD F is either 08:30.880 --> 08:34.758 graphical or or or text . The 08:34.768 --> 08:37.379 text is a long string of data , you 08:37.388 --> 08:41.119 know , describing the the disposal and 08:41.129 --> 08:43.129 discharge . It describes , you know 08:43.129 --> 08:45.351 when it goes through the jet conditions 08:45.351 --> 08:47.296 and when it transitions then to uh 08:47.296 --> 08:49.869 spreading and then to passive transport 08:50.239 --> 08:52.350 and diff and dilution and diffusion . 08:53.799 --> 08:57.299 The output of interest is generated in 08:57.309 --> 08:59.799 the concentration of the contaminant or 08:59.809 --> 09:01.698 suspended solids as a function of 09:01.698 --> 09:04.169 distance from the discharge shown here 09:04.559 --> 09:07.099 are , is a concentration of lead in the 09:07.229 --> 09:10.909 dissolved phase of our discharge . And 09:10.919 --> 09:14.549 what we see it starts off near 25 09:14.659 --> 09:16.826 you know , milligrams per year in this 09:16.826 --> 09:18.770 case and and decreases relative to 09:18.770 --> 09:20.826 rapidly and then slowly uh decreases 09:20.826 --> 09:23.049 after that as it goes through passive 09:23.059 --> 09:26.299 transport infusion , the 09:26.309 --> 09:29.739 bottom graph shows you the mixing zone , 09:30.799 --> 09:34.039 it is depicting the width of the plume 09:34.070 --> 09:36.419 as a function of distance from the 09:36.429 --> 09:39.390 discharge point . In addition , it 09:39.400 --> 09:41.456 tells you , you know , when you have 09:41.456 --> 09:43.511 met certain water quality criteria , 09:43.830 --> 09:47.669 the maximum or acute toxicity 09:47.679 --> 09:50.039 consideration is shown in red . You 09:50.049 --> 09:52.271 know , in this case , it occurs roughly 09:52.271 --> 09:54.327 about 100 and 20 m from the distrust 09:54.327 --> 09:56.750 point . And then it also gives you the 09:56.760 --> 09:59.950 chronic criteria for toxicity , you 09:59.960 --> 10:02.127 know , which is shown here to be about 10:02.127 --> 10:05.570 460 m from the discharge point . So in 10:05.580 --> 10:07.580 this case , it would show you our 10:07.619 --> 10:11.270 mixing zone would need to be 100 and 20 10:11.280 --> 10:14.799 m long and 4 m wide , you know , at 10:14.840 --> 10:18.109 the for the acute toxicity and , and 10:18.119 --> 10:21.669 460 m long and , and 5 m wide 10:21.679 --> 10:25.070 for meeting the chronic toxicity . 10:27.049 --> 10:29.750 The CD F model is available on the dots 10:29.760 --> 10:33.000 website shown here is a uh picture of 10:33.010 --> 10:36.760 the uh the website . Uh It is one of 10:36.770 --> 10:39.500 several of our material disposal 10:39.510 --> 10:43.270 management models which are which you 10:43.280 --> 10:45.710 often use in conjunction in order to 10:45.719 --> 10:48.570 feed the input data into CD fate . So 10:48.580 --> 10:50.858 if you look at the satellite and , and , 10:50.880 --> 10:54.219 and effluent quality and , and we use 10:54.229 --> 10:56.340 that in the CD fate , then that's the 10:56.340 --> 10:59.530 input . It shows that the model is 10:59.539 --> 11:01.679 available both in AD OS version and a 11:01.690 --> 11:04.650 Windows version . And there is a user's 11:04.659 --> 11:08.020 guide documentation manual 11:08.229 --> 11:10.299 with the uh download 11:14.489 --> 11:18.099 er discovering , developing and 11:18.109 --> 11:20.220 delivering new ways to make the world 11:20.220 --> 11:22.280 safer and better every day .