Impact of temperature changes on groundwater levels and irrigation costs in a groundwater-dependent agricultural region in Northwest Bangladesh

IF 0.6 Q4 WATER RESOURCES

Hydrological Research Letters Pub Date : 2017-03-25 DOI:10.3178/HRL.11.85

Golam Saleh Ahmed Salem, S. Kazama, Shamsuddin Shahid, N. Dey

引用次数: 29

Abstract

Changes in hydrological processes due to rising temperatures and related effects on the socio-economy and people’s livelihood are major concerns in Bangladesh. A study has been performed to assess the effects of increasing temperature on the groundwater levels and consequent changes in irrigation costs for groundwater-dependent irrigated agriculture in Northwest Bangladesh. A support vector machine (SVM) was used to model the temporal variations in groundwater level from rainfall, evapotranspiration, groundwater abstraction, and agricultural return flow. A multiple linear regression (MLR) model was developed to define the functional relationship between irrigation costs and groundwater levels. The model showed that average groundwater level during the major irrigation period (January-April) decreased by 0.15-2.01 m due to an increase in temperature of 1-5°C, which increased irrigation costs by 0.05-0.54 thousand Bangladesh Taka (BDT) per hector.

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孟加拉国西北部依赖地下水的农业区温度变化对地下水位和灌溉成本的影响

气温上升引起的水文过程变化以及对社会经济和人民生活的相关影响是孟加拉国的主要关切。已经进行了一项研究，以评估孟加拉国西北部依赖地下水灌溉农业的温度升高对地下水位的影响以及由此导致的灌溉成本变化。使用支持向量机（SVM）对降雨、蒸散、地下水抽取和农业回流引起的地下水位的时间变化进行建模。开发了一个多元线性回归（MLR）模型来定义灌溉成本和地下水位之间的函数关系。该模型显示，由于温度升高1-5°C，主要灌溉期（1-4月）的平均地下水位下降了0.15-2.01 m，灌溉成本每公顷增加0.05-0.54万孟加拉塔卡（BDT）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Hydrological Research Letters WATER RESOURCES-

CiteScore

1.90

自引率

18.20%

发文量

审稿时长

10 weeks

期刊介绍： Hydrological Research Letters (HRL) is an international and trans-disciplinary electronic online journal published jointly by Japan Society of Hydrology and Water Resources (JSHWR), Japanese Association of Groundwater Hydrology (JAGH), Japanese Association of Hydrological Sciences (JAHS), and Japanese Society of Physical Hydrology (JSPH), aiming at rapid exchange and outgoing of information in these fields. The purpose is to disseminate original research findings and develop debates on a wide range of investigations on hydrology and water resources to researchers, students and the public. It also publishes reviews of various fields on hydrology and water resources and other information of interest to scientists to encourage communication and utilization of the published results. The editors welcome contributions from authors throughout the world. The decision on acceptance of a submitted manuscript is made by the journal editors on the basis of suitability of subject matter to the scope of the journal, originality of the contribution, potential impacts on societies and scientific merit. Manuscripts submitted to HRL may cover all aspects of hydrology and water resources, including research on physical and biological sciences, engineering, and social and political sciences from the aspects of hydrology and water resources.