熱収支・水収支観測圃場 観測日誌

Observation diary (excel version)

Observation diary (csv version) (updated 2021.1.06)


Observation diary database structure

The following is an excerpt from “Heat Balance / Water Balance Observation Diary (2)” (published in the separate volume of Report No. 7 of the Land Environment Research Center) .

About 30 years have passed since the hydraulic experiment center, which was the predecessor of the Land Environment Research Center of Tsukuba University, was born, and more than 25 years have passed since the routine observation in the heat balance / water balance observation field was started. It is a rare data that covers all items of balance and water balance, and has been widely used by researchers inside and outside the university and has produced results. In addition, the accumulation of long-term routine data has made it possible to analyze long-term fluctuations and trends of each observation element, and the utility value of the data is increasing. However, on the other hand, the public data has problems such as missing data due to failure of observation equipment and power outage, deterioration of the sensor and the influence of its update. At the time of analysis, it is important to check the quality of the data by referring to the observation diary that records missing data and maintenance items.
Ta et al. (1995) created a database of observation diaries recorded from the beginning of observation in a unified format. This database is open to the public for free on the Internet and is still being updated from time to time. This time, we have published the observation diary from 1996 to 2005, which was compiled by Ta et al. (1995) . We would appreciate it if you could use it as an initial check when analyzing observation data. However, it should be noted that this observation diary describes the range dealt with by the administrator and cannot be said to cover all missing data and errors. Each item in the observation diary database is summarized in Appendix 1 and each observation element is summarized in Appendix 2. For an overview of the observation points and the instruments used for observation, refer to the explanation in this book. sea ​​bream.

Appendix Table 1 .

start date:

The first date when missing data, maintenance, etc. occurred. It is represented by a 6-digit number (YYMMDD). For example, January 1, 1990 is expressed as 900101, and June 30, 2000 is expressed as 100630.

At the start:

Blank means that it is not filled in if it is missing, all day long, otherwise time is not important.

End date:

If left blank, it is the same as the start date. The notation is the same as the start date.

When finished:

The notation is the same as at the start.

Channel:

0 represents all channels, and non-zero represents the element numbers in Table 2. If multiple channels are applicable, they are separated by commas (,).

Missing data:

1 is applicable, blank is not applicable.

Sensor replacement:

1 is applicable, blank is not applicable.

measurement:

1 is applicable, blank is not applicable. Measurements for the purpose of checking routine observation data, such as manual measurement of groundwater level, are applicable.

Coefficient change:

1 is applicable, blank is not applicable. The coefficient of the relational expression between the input voltage and the physical quantity may be changed in order to perform sensor replacement or calibration during regular maintenance. See Toritani et al. (1989) for details.

maintenance:

1 is applicable, blank is not applicable. In addition to regular inspections of measuring instruments and recorders once or twice a year, field maintenance (mowing), replacement of the polydome of the net radiometer, etc. are applicable.

others:

1 does not correspond to missing data, sensor replacement, measurement, coefficient change, or maintenance, and blank corresponds to any of them. Although it is not a routine observation, it also includes those related to intensive observations made in the field. See the article section for specific details.

media:

A, C, P, D, and T mean all media, chart paper, printer output, floppy disks and tapes, respectively. The tape has not been used since November 8, 1988. In addition, after the transition to the 3rd generation meteorological and hydrological observation data collection and disclosure system (Asanuma et al. 2004) on May 1, 2003, no recording paper or printer was output.

article:

This is a slight change in terms and phrases to the contents described in the observation diary.

Appendix Table 2.

Appendix Table 2
In addition, there are cases where two or more items such as missing data, maintenance, sensor replacement, and coefficient change are applicable.

In this way, it can be easily used for checking data, etc., because it is possible to know at a glance which media corresponds to missing data, maintenance, sensor replacement, coefficient change, and so on. However, due to inconsistencies in terms and phrases due to updates of observation equipment and data recording systems and frequent changes in the person in charge, some inaccuracies were included when reclassifying these categories from articles, and some entries were omitted. Of course, it is possible.

In the future, we plan to update the observation diary together with the observation data as needed and post it on the Internet.
Tadashi et al. (1996) “Heat Balance / Water Balance Observation Diary, University of Tsukuba Hydraulic Experiment Center” (Hydraulic Experiment Center Report No. 20 Supplement)

Masato Taniguchi, Ryuichi Kawamura, Jun Shimada (1989): Heat Balance / Water Balance Observation Data (3) — Water Balance Edition–August 1981-December 1987, University of Tsukuba Hydrological Experiment Center-Report, NO .13 Separate volume, 80pp.

Hitoshi Toriya, Ryuichi Kawamura, Kazuo Kofujita, Jun Shimada (1988): Heat Balance / Water Balance Observation Data (2) — Heat Balance — July 1981-December 1987, University of Tsukuba Hydraulic Experiment Center -Report, NO.12 separate volume, 73pp.

Hitoshi Toriya, Ryuichi Kawamura, Jun Shimada, Masato Taniguchi, Takahisa Nishimoto (1989): University of Tsukuba Hydraulic Experiment Center-Report, NO.13, p147–158.

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