Your search found 3 records
1 Babel, M. S.; Wahid, S. M.. 2009. Freshwater under threat, South East Asia: vulnerability assessment of freshwater resources to environmental change, Mekong River Basin. Nairobi, Kenya: UNEP. 31p.
River basins ; Water resources ; Assessment ; Ecology ; River basin management ; Territorial waters / South East Asia / Cambodia / Mekong River Basin / Tonle Sap River Basin
(Location: IWMI HQ Call no: e-copy only Record No: H034801)
http://www.roap.unep.org/publications/SEA_Water_report.pdf
https://vlibrary.iwmi.org/pdf/H034801.pdf
https://vlibrary.iwmi.org/pdf/H034801.pdf
(4.44 MB)
2 Bastakoti, Ram C.; Bharati, Luna; Bhattarai, U.; Wahid, S. M.. 2017. Agriculture under changing climate conditions and adaptation options in the Koshi Basin. Climate and Development, 9(7):634-648. [doi: https://doi.org/10.1080/17565529.2016.1223594]
Climate change adaptation ; Water availability ; Water scarcity ; Agricultural practices ; Agricultural production ; Cultivated land ; Highlands ; Households ; Floodplains ; Drought ; Crop yield ; Land use ; Living standards ; Risk management ; Diversification ; Communities ; Upstream ; Downstream ; River basins ; Temperature / Nepal / Koshi Basin / Himalayas
(Location: IWMI HQ Call no: e-copy only Record No: H048038)
Using biophysical and social analysis methods, this paper evaluated agricultural practices under changing climate in the Koshi Basin and assessed adaptation options. Agricultural trend analysis showed that in the recent three to four decades, the total cultivated area had declined in all parts of the basin except in the Nepal Mountain Region. Household survey results also confirmed such decline and further revealed shifts towards non-agricultural activities. Climate trend analysis showed changes in the frequency of wet and dry days in study districts, implying an increasing chance of flood and drought events. Household surveys further revealed that, in general, people perceived a decline in agricultural water availability and an increase in drought and flood events. The direct impacts of these changes were reduced crop yield, increased fallow lands, displacement of people from settlement areas, sedimentation of cultivable land and damage to properties. Household surveys showed that despite the perceived impacts on agriculture and livelihoods, only limited adaptation options are currently practised. Adaptation efforts are constrained by several factors, including: finance; technical knowledge; lack of awareness about adaptation options; lack of collective action; unclear property rights; and ineffective role of state agencies.
3 Shrestha, N. K.; Qamer, F. M.; Pedreros, D.; Murthy, M. S. R.; Wahid, S. M.; Shrestha, M. 2017. Evaluating the accuracy of Climate Hazard Group (CHG) satellite rainfall estimates for precipitation based drought monitoring in Koshi Basin, Nepal. Journal of Hydrology: Regional Studies, 13:138-151. [doi: https://doi.org/10.1016/j.ejrh.2017.08.004]
Meteorological observations ; Satellite observation ; Drought ; Rain ; Monitoring techniques ; Evaluation ; Precipitation ; Weather data ; Estimation ; Meteorological stations ; Mountains ; River basins / Nepal / Koshi Basin
(Location: IWMI HQ Call no: e-copy only Record No: H048329)
http://www.sciencedirect.com/science/article/pii/S2214581817300563/pdfft?md5=a0555e8065605f69522a60b59a4520d2&pid=1-s2.0-S2214581817300563-main.pdf
https://vlibrary.iwmi.org/pdf/H048329.pdf
https://vlibrary.iwmi.org/pdf/H048329.pdf
(1.64 MB) (1.64 MB)
Study region: Koshi basin, Nepal.
Study focus: While rainfall estimates based on satellite measurements are becoming a very attractive option, they are characterized by non-negligible biases. As such, we assessed the accuracy of two satellite products of the Climate Hazard Group (CHG) – (a) a satellite-only Climate Hazards Group InfraRed Precipitation (CHIRP) product, and (b) a CHIRP blended with ground-based station data (CHIRPS) – at a monthly time scale from 1981 to 2010 in the Koshi basin of Nepal using ground-based measurements. A separate analysis was also made for the data set after 1992, as the number of stations used in the blending has significantly reduced since 1992. Next, both CHG data sets were used to calculate one of the most popularly-used precipitation-based drought indicators – the Standardized Precipitation Index (SPI).
New hydrological insights for the study region: The accuracy of the CHG data set was found to be better in low-lying regions, while it was worse in higher-elevation regions. While the CHIRPS data set was better for the whole period, the CHIRP data set was found to be better for the period after 1992. Physiographic region-wise bias correction has improved the accuracy of the CHG products significantly, especially in higher-elevation regions. In terms of SPI values, the two CHG data sets indicated different drought severity when considering the whole period. However, the SPI values, and hence the drought severity were comparable when using the data from after 1992.
Study focus: While rainfall estimates based on satellite measurements are becoming a very attractive option, they are characterized by non-negligible biases. As such, we assessed the accuracy of two satellite products of the Climate Hazard Group (CHG) – (a) a satellite-only Climate Hazards Group InfraRed Precipitation (CHIRP) product, and (b) a CHIRP blended with ground-based station data (CHIRPS) – at a monthly time scale from 1981 to 2010 in the Koshi basin of Nepal using ground-based measurements. A separate analysis was also made for the data set after 1992, as the number of stations used in the blending has significantly reduced since 1992. Next, both CHG data sets were used to calculate one of the most popularly-used precipitation-based drought indicators – the Standardized Precipitation Index (SPI).
New hydrological insights for the study region: The accuracy of the CHG data set was found to be better in low-lying regions, while it was worse in higher-elevation regions. While the CHIRPS data set was better for the whole period, the CHIRP data set was found to be better for the period after 1992. Physiographic region-wise bias correction has improved the accuracy of the CHG products significantly, especially in higher-elevation regions. In terms of SPI values, the two CHG data sets indicated different drought severity when considering the whole period. However, the SPI values, and hence the drought severity were comparable when using the data from after 1992.
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