@@ -9,3 +9,183 @@ conflate_model
99
1010.. autofunction :: ripple1d.ops.ras_conflate.conflate_model
1111 :no-index:
12+
13+ ********************
14+ Conflation Behavior
15+ ********************
16+
17+ Below are several examples depicting how a HEC-RAS model would be conflated to
18+ the National Water Model (NWM) network.
19+
20+ **Conflation Test A **
21+
22+ .. image :: ../images/conflation_tests/test_a.jpg
23+ :width: 800
24+ :alt: test a
25+ :align: center
26+
27+
28+ In this scenario a single HEC-RAS source model is split into four sub models.
29+ The sub model for each NWM reach contains all intersecting RAS ross-sections
30+ plus one downstream. The downstream cross-section thus matches the upstream-most
31+ cross-section of the next downstream sub model (multi-colored sections in the
32+ third panel), creating a seamless FIM.
33+
34+ Reach 4 does not have any intersecting HEC-RAS cross-sections, however, it is
35+ sandwiched by two NWM reaches with sub models. In this situation, the NWM reach
36+ is marked as "eclipsed".
37+
38+ **Conflation Test B **
39+
40+ .. image :: ../images/conflation_tests/test_b.jpg
41+ :width: 800
42+ :alt: test b
43+ :align: center
44+
45+
46+ This scenario mimics a HEC-RAS model with multiple reaches (only mainstem shown).
47+ Since the HEC-RAS reaches are contained within a single NWM reach, the sub model
48+ is created by joining all HEC-RAS cross-sections together.
49+
50+ **Conflation Test C **
51+
52+ .. image :: ../images/conflation_tests/test_c.jpg
53+ :width: 800
54+ :alt: test c
55+ :align: center
56+
57+
58+ This scenario shows that multiple NWM reaches may be eclipsed in sequence.
59+
60+ **Conflation Test D **
61+
62+ .. image :: ../images/conflation_tests/test_d.jpg
63+ :width: 800
64+ :alt: test d
65+ :align: center
66+
67+
68+ When the next downstream reach of a model would be a junction, the sub model
69+ takes the first cross-section downstream of the junction as its downstream limit.
70+
71+ **Conflation Test D **
72+
73+ .. image :: ../images/conflation_tests/test_d.jpg
74+ :width: 800
75+ :alt: test d
76+ :align: center
77+
78+
79+ When the next downstream reach of a model would be a junction, the sub model
80+ takes the first cross-section downstream of the junction as its downstream limit.
81+
82+ **Conflation Test E **
83+
84+ .. image :: ../images/conflation_tests/test_e.jpg
85+ :width: 800
86+ :alt: test e
87+ :align: center
88+
89+
90+ Similarly to Test E, when two HEC-RAS reaches confluence, the sub models will
91+ share a downstream cross-section with the most upstream cross-section of the
92+ downstream model (shared between three models).
93+
94+ **Conflation Test F **
95+
96+ .. image :: ../images/conflation_tests/test_f.jpg
97+ :width: 800
98+ :alt: test f
99+ :align: center
100+
101+
102+ Same as Test E.
103+
104+ **Conflation Test G **
105+
106+ .. image :: ../images/conflation_tests/test_g.jpg
107+ :width: 800
108+ :alt: test g
109+ :align: center
110+
111+
112+ A sub model may traverse both an eclipsed reach and a confluence to find the
113+ next downstream cross-section.
114+
115+ **Conflation Test H **
116+
117+ .. image :: ../images/conflation_tests/test_h.jpg
118+ :width: 800
119+ :alt: test h
120+ :align: center
121+
122+
123+ Same as Test G but with the eclipsed reach downstream of the confluence.
124+
125+ **Conflation Test I **
126+
127+ .. image :: ../images/conflation_tests/test_i.jpg
128+ :width: 800
129+ :alt: test i
130+ :align: center
131+
132+
133+ In this test, the confluences between the NWM and HEC-RAS are not aligned. The
134+ NWM confluence is upstream of a cross-section on one of the tributary HEC-RAS
135+ reaches. Further complicating the setup, NWM reach 3 intersects cross-sections
136+ along the confluencing HEC-RAS reach.
137+
138+ After ripple1d completes initial conflation, if it finds that the HEC-RAS model
139+ has been conflated with a NWM confluence (i.e., a NWM reach has both children)
140+ present in the conflation.json, it will force both tributary sub models to
141+ have a downstream cross-section at the first section downstream of the HEC-RAS
142+ junction and the downstream sub model to have an upstream cross-section at that
143+ section.
144+
145+ **Conflation Test J **
146+
147+ .. image :: ../images/conflation_tests/test_j.jpg
148+ :width: 800
149+ :alt: test j
150+ :align: center
151+
152+
153+ This test was created in response to `github issue #311 <https://github.com/Dewberry/ripple1d/issues/311 >`_.
154+ This scenario verifies that NWM reaches will not conflate to nearby HEC-RAS
155+ models that to not overlap the reach extents.
156+
157+ **Conflation Test K **
158+
159+ .. image :: ../images/conflation_tests/test_k.jpg
160+ :width: 800
161+ :alt: test k
162+ :align: center
163+
164+
165+ See description of Test J. This complex confluence geometry is still locked
166+ such that the sub models will be on their appropriate tributary and contain the
167+ first cross-section downstream of the junction as their shared cross-section.
168+
169+ **Conflation Test L **
170+
171+ .. image :: ../images/conflation_tests/test_l.jpg
172+ :width: 800
173+ :alt: test l
174+ :align: center
175+
176+
177+ In this example, the HEC-RAS model does not contain a junction. Sub model 3
178+ will therefore not share a cross-section with 1 and 2.
179+
180+ **Conflation Test M **
181+
182+ .. image :: ../images/conflation_tests/test_m.jpg
183+ :width: 800
184+ :alt: test m
185+ :align: center
186+
187+
188+ In this scenario, a first order NWM reach only intersects some of the HEC-RAS
189+ cross-sections. When additional cross-sections are available upstream of a
190+ first order tributary, ripple1d will extend one cross-section upstream of the
191+ last cross-section to provide complete reach coverage.
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