C. Brogi, H. Bogena, M. Köhli, J. Huisman, H. Hendricks Franssen, Olga Dombrowski
{"title":"宇宙射线中子传感器监测灌溉的可行性","authors":"C. Brogi, H. Bogena, M. Köhli, J. Huisman, H. Hendricks Franssen, Olga Dombrowski","doi":"10.5194/gi-11-451-2022","DOIUrl":null,"url":null,"abstract":"Abstract. Accurate soil moisture (SM) monitoring is key in\nirrigation as it can greatly improve water use efficiency. Recently,\ncosmic-ray neutron sensors (CRNSs) have been recognized as a promising tool\nin SM monitoring due to their large footprint of several hectares. CRNSs also\nhave great potential for irrigation applications, but few studies have\ninvestigated whether irrigation monitoring with CRNSs is feasible, especially\nfor irrigated fields with a size smaller than the CRNS footprint. Therefore,\nthe aim of this study is to use Monte Carlo simulations to investigate the\nfeasibility of monitoring irrigation with CRNSs. This was achieved by\nsimulating irrigation scenarios with different field dimensions (from 0.5\nto 8 ha) and SM variations between 0.05 and 0.50 cm3 cm−3.\nMoreover, the energy-dependent response functions of eight moderators with\ndifferent high-density polyethylene (HDPE) thickness or additional\ngadolinium thermal shielding were investigated. It was found that a\nconsiderable part of the neutrons that contribute to the CRNS footprint can\noriginate outside an irrigated field, which is a challenge for irrigation\nmonitoring with CRNSs. The use of thin HDPE moderators (e.g. 5 mm) generally\nresulted in a smaller footprint and thus stronger contributions from the\nirrigated area. However, a thicker 25 mm HDPE moderator with gadolinium\nshielding improved SM monitoring in irrigated fields due to a higher\nsensitivity of neutron counts with changing SM. This moderator and shielding\nset-up provided the highest chance of detecting irrigation events,\nespecially when the initial SM was relatively low. However, variations in SM\noutside a 0.5 or 1 ha irrigated field (e.g. due to irrigation of\nneighbouring fields) can affect the count rate more than SM variations due\nto irrigation. This suggests the importance of retrieving SM data from the\nsurrounding of a target field to obtain more meaningful information for\nsupporting irrigation management, especially for small irrigated fields.\n","PeriodicalId":48742,"journal":{"name":"Geoscientific Instrumentation Methods and Data Systems","volume":null,"pages":null},"PeriodicalIF":1.8000,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"Feasibility of irrigation monitoring with cosmic-ray neutron sensors\",\"authors\":\"C. Brogi, H. Bogena, M. Köhli, J. Huisman, H. Hendricks Franssen, Olga Dombrowski\",\"doi\":\"10.5194/gi-11-451-2022\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Abstract. Accurate soil moisture (SM) monitoring is key in\\nirrigation as it can greatly improve water use efficiency. Recently,\\ncosmic-ray neutron sensors (CRNSs) have been recognized as a promising tool\\nin SM monitoring due to their large footprint of several hectares. CRNSs also\\nhave great potential for irrigation applications, but few studies have\\ninvestigated whether irrigation monitoring with CRNSs is feasible, especially\\nfor irrigated fields with a size smaller than the CRNS footprint. Therefore,\\nthe aim of this study is to use Monte Carlo simulations to investigate the\\nfeasibility of monitoring irrigation with CRNSs. This was achieved by\\nsimulating irrigation scenarios with different field dimensions (from 0.5\\nto 8 ha) and SM variations between 0.05 and 0.50 cm3 cm−3.\\nMoreover, the energy-dependent response functions of eight moderators with\\ndifferent high-density polyethylene (HDPE) thickness or additional\\ngadolinium thermal shielding were investigated. It was found that a\\nconsiderable part of the neutrons that contribute to the CRNS footprint can\\noriginate outside an irrigated field, which is a challenge for irrigation\\nmonitoring with CRNSs. The use of thin HDPE moderators (e.g. 5 mm) generally\\nresulted in a smaller footprint and thus stronger contributions from the\\nirrigated area. However, a thicker 25 mm HDPE moderator with gadolinium\\nshielding improved SM monitoring in irrigated fields due to a higher\\nsensitivity of neutron counts with changing SM. This moderator and shielding\\nset-up provided the highest chance of detecting irrigation events,\\nespecially when the initial SM was relatively low. However, variations in SM\\noutside a 0.5 or 1 ha irrigated field (e.g. due to irrigation of\\nneighbouring fields) can affect the count rate more than SM variations due\\nto irrigation. 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Feasibility of irrigation monitoring with cosmic-ray neutron sensors
Abstract. Accurate soil moisture (SM) monitoring is key in
irrigation as it can greatly improve water use efficiency. Recently,
cosmic-ray neutron sensors (CRNSs) have been recognized as a promising tool
in SM monitoring due to their large footprint of several hectares. CRNSs also
have great potential for irrigation applications, but few studies have
investigated whether irrigation monitoring with CRNSs is feasible, especially
for irrigated fields with a size smaller than the CRNS footprint. Therefore,
the aim of this study is to use Monte Carlo simulations to investigate the
feasibility of monitoring irrigation with CRNSs. This was achieved by
simulating irrigation scenarios with different field dimensions (from 0.5
to 8 ha) and SM variations between 0.05 and 0.50 cm3 cm−3.
Moreover, the energy-dependent response functions of eight moderators with
different high-density polyethylene (HDPE) thickness or additional
gadolinium thermal shielding were investigated. It was found that a
considerable part of the neutrons that contribute to the CRNS footprint can
originate outside an irrigated field, which is a challenge for irrigation
monitoring with CRNSs. The use of thin HDPE moderators (e.g. 5 mm) generally
resulted in a smaller footprint and thus stronger contributions from the
irrigated area. However, a thicker 25 mm HDPE moderator with gadolinium
shielding improved SM monitoring in irrigated fields due to a higher
sensitivity of neutron counts with changing SM. This moderator and shielding
set-up provided the highest chance of detecting irrigation events,
especially when the initial SM was relatively low. However, variations in SM
outside a 0.5 or 1 ha irrigated field (e.g. due to irrigation of
neighbouring fields) can affect the count rate more than SM variations due
to irrigation. This suggests the importance of retrieving SM data from the
surrounding of a target field to obtain more meaningful information for
supporting irrigation management, especially for small irrigated fields.
期刊介绍:
Geoscientific Instrumentation, Methods and Data Systems (GI) is an open-access interdisciplinary electronic journal for swift publication of original articles and short communications in the area of geoscientific instruments. It covers three main areas: (i) atmospheric and geospace sciences, (ii) earth science, and (iii) ocean science. A unique feature of the journal is the emphasis on synergy between science and technology that facilitates advances in GI. These advances include but are not limited to the following:
concepts, design, and description of instrumentation and data systems;
retrieval techniques of scientific products from measurements;
calibration and data quality assessment;
uncertainty in measurements;
newly developed and planned research platforms and community instrumentation capabilities;
major national and international field campaigns and observational research programs;
new observational strategies to address societal needs in areas such as monitoring climate change and preventing natural disasters;
networking of instruments for enhancing high temporal and spatial resolution of observations.
GI has an innovative two-stage publication process involving the scientific discussion forum Geoscientific Instrumentation, Methods and Data Systems Discussions (GID), which has been designed to do the following:
foster scientific discussion;
maximize the effectiveness and transparency of scientific quality assurance;
enable rapid publication;
make scientific publications freely accessible.