Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Impact of Climate Change on Crop Water Demand and Its Implication on Water Resources Planning: Bangladesh Perspective

Dr. M. H. Ali
AED, BINA

A. K. M. Adham
Assist. Prof.
IWM, BAU

Abstract/ Executive Summary:

In this study, an investigation was made on the response of evapotranspiration (representation of crop water demand) due to possible changes in climatic parameters at three locations of Bangladesh. The results suggest an increase of 11 to 15% of total ET demand with an increase in maximum temperature (in isolation) by 20%. Increase of 10% in temperature alone with 10% decrease in bright sunshine hour (SH) and wind speed (WS) could result even in marginal increase in total ET (3.1%). A 10% increase in temperature coupled with 10% increase in SH, WS, and 15% decrease in relative humidity could result in 18.5% increase in annual ET. Any change in evapotranspiration will be likely to have a profound effect on agriculture and water resource planning. It is the time for planners/users to think in terms of expected change in water requirement due to global climate change while planning for development of future water resources. A wide spectrum climate change scenario is discussed in the paper as guideline for future development and planning of water resources.

Keywords: Climate change, Evapotranspiration, Crop water demand, Water resource planning, Bangladesh

Location: BINA, Mymensingh

Start Date:

End Date:

Program Area: Socio-economic and Policy

Non-commodity: , Impact

Objectives:

To investigation the change in evapotranspiration demand taking into account a wide spectrum scenario of climate change, taking the climatic data of three agro-ecological zones of Bangladesh.

Methodology:

Study area: Data of three different weather stations located at different representative regions: Mymensingh, Rangpur and Rajshahi.

Climatic Data: Data of the climatic variables were collected from Bangladesh Meteorological Department. Monthly average of long-term meteorological parameters have been used as reference data for study.

Range of climatic change considered: Global climate model predicts regional temperature changes, which range from slight cooling to a nearly 10 ⁰C warming, depending on latitude and season. Rosenberg et al.(1989) calculated expected change in temperature ranging between – 4 to + 10 ⁰C. The ET₀ values were calculated using FAO CROPWAT model, windows version 4.2 (FAO, 1995).

Source of Information: J. Agrometeorol., 9(1): 20-25, (2007)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In response to the change in temperature by ± 20 %, ET varied between – 11.6 to + 15.2% in comparison to increased temperature. Change in minimum temperature has a little effect on annual ET. The ET showed an increasing trend with the decrease in humidity and vice versa. Wind speed and bright sunshine hour affect ET in similar fashion, with a little higher magnitude than that of bright sunshine hour. Increasing bright sunshine hour and wind speed by 20%, increased ET by about 8 and 3%, respectively, and vice versa.

Knowledge Management: Journal