Estimation of loss in arable land and irrigation requirements using high-resolution imagery and Google Earth Engine

IF 1.6 4区农林科学 Q2 AGRONOMY

Irrigation and Drainage Pub Date : 2024-01-31 DOI:10.1002/ird.2931

Majid Farooq, Fayma Mushtaq, Ubaid Yousuf

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Abstract

Water resources planning and management are critical in intricate basins such as the Indus Basin, shared by India and Pakistan under the Indus Water Treaty (IWT) for food security, conserving the environment, sustainable economic development and supporting livelihoods. The present study assesses arable land loss within the Padshahi and Sindh Extension (SE) canal catchments over 54 years, utilizing high-resolution satellite imagery and Google Earth Engine's normalized difference vegetation index (NDVI) derivations for strategizing irrigation efficiency, minimizing water loss and ensuring sustainable utilization of limited water resources under the IWT. Results revealed that irrigated land has decreased from 5127 ha (1966) to 3501 ha (2020) in both canals. The Padshahi canal sees substantial loss (1278 ha), primarily due to the highest transitions from agricultural land/crop land (−69%) to built-up areas. The SE canal, experiencing shifts to horticulture and plantation, records relatively fewer changes in built-up areas (348 ha). The monthly variation in the NDVI clearly depicted the high demand for irrigation to cater to agricultural lands with the onset of the sowing season for paddy in the Padshahi (1900 ha) and SE (2600 ha) canals in May.

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利用高分辨率图像和谷歌地球引擎估算耕地损失和灌溉需求

在印度和巴基斯坦根据《印度河流域水条约》（IWT）共有的印度河流域等错综复杂的流域，水资源规划和管理对于粮食安全、保护环境、可持续经济发展和支持生计至关重要。本研究利用高分辨率卫星图像和谷歌地球引擎的归一化差异植被指数（NDVI）推导，评估了 54 年来 Padshahi 和信德省扩展（SE）运河集水区的耕地流失情况，以制定灌溉效率战略，最大限度地减少水资源流失，确保在《印度河水条约》下可持续地利用有限的水资源。结果显示，两条运河的灌溉面积从 5127 公顷（1966 年）减少到 3501 公顷（2020 年）。Padshahi 运河的灌溉面积大幅减少（1278 公顷），主要原因是从农田/作物地（-69%）到建筑区的过渡面积最大。而东南运河由于经历了向园艺和种植业的转移，其建筑密集区的变化相对较小（348 公顷）。随着 5 月份 Padshahi（1900 公顷）和东南运河（2600 公顷）水稻播种季节的到来，净植被指数的月度变化清楚地表明了农田灌溉的高需求量。

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来源期刊

Irrigation and Drainage 农林科学-农艺学

CiteScore

3.40

自引率

10.50%

发文量

107

审稿时长

3 months

期刊介绍： Human intervention in the control of water for sustainable agricultural development involves the application of technology and management approaches to: (i) provide the appropriate quantities of water when it is needed by the crops, (ii) prevent salinisation and water-logging of the root zone, (iii) protect land from flooding, and (iv) maximise the beneficial use of water by appropriate allocation, conservation and reuse. All this has to be achieved within a framework of economic, social and environmental constraints. The Journal, therefore, covers a wide range of subjects, advancement in which, through high quality papers in the Journal, will make a significant contribution to the enormous task of satisfying the needs of the world’s ever-increasing population. The Journal also publishes book reviews.