HYPROP manual - UMS

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Appendix Description of the measuring process • The measurement process is typical of a sand with low fines • The water tensions rise spontaneously immediately after the start of measurement, until they reach a level that corresponds to the bubble point. In this case it is about 30 cm (pF 1.5). • Small "spikes" at the beginning of the measurements indicates that the air is not uniform, but in jerks occur in the system. This will be shown in the evaluation of the retention curve. • The tensiometers run for a long time completely parallel, and differs only around a hydrostatic pressure difference of 2.5 hPa . • Only after the main pores are beeing drained, the upper tensiometer value initially rises exponentially. The tensiometer failled very quickly, and the air entry point of the ceramic tip is reached shortly, while the lower tensiometer is still in the regular measuring range. • The difference of the tensions is suitable only after reaching the exponential rise, that hydraulic conductivities can be calculated. • The measurement is completed due to the failure of the upper tensiometer after a lost of of nearly 30% water. . 86/104
Appendix Evaluation The additional data in the dry zone were by Lisa Heise within their thesis at TU Braunschweig / <strong>UMS</strong> Munich measured using a device made by Decagon (WP4C. They are documented in Heise's thesis (http://www.soil.tubs.de/mitarbeiter/dipl_detail.php? id=78). • The pronounced air entry point and the steep drop down of the retention curve after reaching the air entry point is characteristic of the sand. • The hydraulic conductivity can be determined only from 2.0 pF, and then drops down steeply. • Suitable models for data description are the Fayer-Simmons model, or the bimodal model to describe the subsequent drop of the retention values towards dehydration. 87/104
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User Manual HYPROP
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HYPROP system 5.2.5 Stored readings
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HYPROP system 1 HYPROP system Labor
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HYPROP system Bag 2 (white lock): s
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HYPROP system 2. Peters, A., and W.
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HYPROP system 1.6 Important note Th
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Product description 3 Product descr
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Product description 3.2.3 Tensiomet
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With tensioLINK ® you are able to
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Get ready to start a measuring camp
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Page 35 and 36: Set-up the HYPROP 5 Set-up the HYPR
Page 37 and 38: Set-up the HYPROP In the single dev
Page 39 and 40: Set-up the HYPROP Please note the f
Page 41 and 42: Set-up the HYPROP 5.2 Software tens
Page 43 and 44: Set-up the HYPROP Depending on the
Page 45 and 46: Set-up the HYPROP Soil volume Volum
Page 47 and 48: Set-up the HYPROP 5.2.4 Current rea
Page 49 and 50: Set-up the HYPROP Select the scale
Page 51 and 52: Perform a measuring campaign 3. The
Page 53 and 54: Perform a measuring campaign 6.3 Co
Page 55 and 56: Perform a measuring campaign 6.4.4
Page 57 and 58: Perform a measuring campaign Figure
Page 59 and 60: Perform a measuring campaign 6.5 De
Page 61 and 62: Perform a measuring campaign If the
Page 63 and 64: Perform a measuring campaign 3. Ple
Page 65 and 66: Perform a measuring campaign 6.8 Dr
Page 67 and 68: Trouble shooting 8 Trouble shooting
Page 69 and 70: Service and maintenance 9 Service a
Page 71 and 72: Service and maintenance 9.4 Change
Page 73 and 74: Theoretical basics 10 Theoretical b
Page 75 and 76: Theoretical basics 10.3.1 The van G
Page 77 and 78: Additional notes 11 Additional note
Page 79 and 80: Additional notes 11.2 Vapour pressu
Page 81 and 82: Appendix Description of the measuri
Page 83 and 84: Appendix 12.1.2 Clayey silt (Ut3) S
Page 85: Appendix 12.1.3 Slightly loamy Sand
Page 89 and 90: Appendix • After draining the mai
Page 91 and 92: Appendix 12.3 Parameter list 12.3.1
Page 93 and 94: Appendix 12.3.3 Parameter listing a
Page 95 and 96: Appendix 12.5 Technical specificati
Page 97 and 98: Appendix 12.6 Accessories 12.6.1 HY
Page 99 and 100: 13 List of literature • Brooks, R
Page 101 and 102: List of literature • Schindler, U
Page 103 and 104: Index M matric potential ..........
Page 106: © 2012 UMS GmbH, Munich, Germany P
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