سال انتشار: ۱۳۹۰

محل انتشار: همایش بین المللی دانش سنتی مدیریت منابع آب

تعداد صفحات: ۱۱

نویسنده(ها):

C. S Jahan – Department of Geology and Mining, University of Rajshahi, Rajshahi 6205, Bangladesh
Q. H. Mazumder –
N Ali –
A. T. M. S Rahaman –

چکیده:

For socio-economic emancipation by achieving self-sufficiency in food through agricultural growth, the Barind Integrated Area Development Project (BIADP) under the Barind Multipurpose Development Authority (BMDA) was launched more than three decades back in barren agro-based landscape of Barind area in NW Bangladesh. In the area low rainfall results in harsh climate with high summer temperature. Due to scarcity of surface water, presently 74% cultivable land area is being irrigated mostly (96%) by groundwater boosting cropping intensity from 117% to about 200% (national average: 174.6%). Recurring prolonged draught and inadequate irrigation reduces yield of paddy in rainless period by about 50%. Since the start of BIADP, average rainfall had an increasing trend (1.68-4.90 mm/year) in the southern portion, but in the northeast trend was reverse (-0.46 mm/year). During this period, due to lack of replenishment and over exploitation of groundwater water table progressively declined (average -0.10 m/day) turning the area into zone of low groundwater potential where northern part creeping towards semi-aridity. Annual long time observed and projected (up to 2050) climate change scenario by time series analysis reveals a general decrease in summer precipitation together with increase in temperature and enhanced evaporative demand would lead to reduced summer soil moisture and therefore more frequent and more intense droughts. Moreover, in the western part of the area high level of arsenic content in aquifers is associated with fine grained sediments. So the available groundwater resource must not be used indiscriminately and proper resource management approach with ecological balance must be warranted. Consequently, the strongly felt need for sustainable solution to this woe has led to the search for year-round dependable source of irrigation water in the context of climate change scenario and water quality challenges. So water buffer management practices like rainwater conservation, rainwater harvesting, small-scale river bank infiltration and irrigation by river water have been undertaken in the drought prone area as a heart of climate change adaptation, playing vital role for livelihood of people and economy