Campbell Met One 034A-L Manual do Operador descarregar pdf (Página 11)

Manual

1.1 General

This manual presents detailed instructions for the installation, operation, and maintenance of the Automatic Weath-

er Stations (AWS) installed in the Nile Basin by the FAO Nile Basin Water Resources Project. The monitoring equip-

ment was procured from Campbell Scientific, USA. This company has a proven track record in Africa, and a number

of Campbell Scientific AWS have been operational in the basin for several years.

The reader is advised to study this manual carefully before starting to work with the monitoring equipment. We

have worked hard to present the user instructions as concise as possible, although we have not compromised on the

necessary detail. Background information on the functioning of the various instruments is presented at appropri-

ate occasions. We hope this will provide the user with a clear overview of the role of each AWS element in the data

acquisition process.

In the remainder of this text, Automatic Meteorological Station is referred to as Met Station.

Main purpose of the Met Stations is to collect continuous high quality climatological data. Such information is used

for many purposes, including:

- Climate change assessment;

- Hydrological analysis;

- Calibration of METEOSAT rainfall estimation algorithm;

- Evaporation estimation of large water bodies (Lake Victoria, Lake Nasser);

- Agricultural planning, etc.

The Met Stations are equipped with sensors for (1) rainfall, (2) air temperature, (3) relative humidity, (4) wind

speed, (5) wind direction, and (6) incoming short wave solar radiation. These parameters facilitate estimating poten-

tial (open water) evaporation using the Penman-Monteith or Priestley-Taylor approach.

The project has advocated the introduction of electronic monitoring equipment in the Nile basin. The use of elec-

tronic sensors connected to a datalogger is now well established in the world, and carries many advantages. For

example, it facilitates automation of data processing. It is the experience of the authors that processing of the obser-

vations often forms the main obstacle in the data collection process, not so much the actual measurement. Another

major benefit of electronic monitoring is the acquisition of a continuous set of sub daily data values. This provides

important additional information on the behavior of the often highly variable climatological parameters.

The project operated an AWS at its compound for testing and manual preparation purposes for several months.

This station worked impeccable and did not show any technical problem in the testing period. Based on this experi-

ence, and the fact that other Campbell Scientific AWS’ are satisfactorily operational in the basin for several years

now, the project believes that automatic monitoring of meteorological parameters is feasible within the Nile basin.

However, this under the provision that the user follows the operation and maintenance instructions presented in

this manual.

1.2 Individual Components of the Met Station

Figure 1 shows a Met Station with a similar sensor configuration as selected for the Nile basin. Obviously, this

figure only shows the external hardware components. A number of essential elements (datalogger and power

supply) are placed within the protective enclosure and therefore not visible on this picture.

tions will be issued in the future.

Introduction

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Campbell Met One 034A-L Manual do Operador Página 11