scholarly journals Identifying Alternative Wetting and Drying Adoption (AWD) in the Vietnamese Mekong River Delta: A Change Detection Approach

2019 ◽  
Vol 8 (7) ◽  
pp. 312 ◽  
Author(s):  
Robin J. Lovell
Keyword(s):  
Time Series ◽  
Change Detection ◽  
Radar Data ◽  
River Delta ◽  
Mekong River ◽  
Series Data ◽  
Wetting And Drying ◽  
Mekong River Delta ◽  
The Impact

Alternative wetting and drying (AWD) is an increasingly popular water-saving practice in rice production in the Vietnamese Mekong River Delta, especially considering the impact of projected climate change and reduced water availability. Unfortunately, it is very difficult to determine adoption without deploying thousands of costly household surveys. This research used European Space Agency Sentinel-1a and 1b radar data, combined with in-situ moisture readings, to determine AWD adoption through change detection of a time series wetness index (WI). By using a beta coefficient of the radar data, the WI avoided the pitfalls of cloud cover, surface roughness, and vegetative interference that arise from the sigma coefficient data. The analysis illustrated an AWD adoption likelihood scale across the delta and it showed potential for the use of remotely sensed data to detect adoption. Trends across the Vietnamese delta showed higher adoption rates inland, with lower adoption of AWD in the coastal provinces. These results were supported by a simultaneous effort to collect household level adoption data as part of the same project. However, correlation between the WI values and in situ soil moisture meter readings were most accurate in alluvial soils, illustrating a particularly strong relationship between soil type and WI model robustness. The research suggests that future change detection efforts should focus on retrieving a multi-season dataset and employing a power density analysis on the time series data to fully understand the periodicity of dry down patterns.

scholarly journals The impact of an adjusted cropping calendar on the welfare of rice farming households in the Mekong River Delta, Vietnam

2022 ◽  
Author(s):  
Alice Joan G. Ferrer ◽  
Le Ha Thanh ◽  
Nguyen Tuan Kiet ◽  
Pham Hong Chuong ◽  
Vu Thu Trang ◽  
...  
Keyword(s):  
River Delta ◽  
Mekong River ◽  
Rice Farming ◽  
Mekong River Delta ◽  
The Impact ◽  
Farming Households

Examining spatiotemporal salinity dynamics in the Mekong River Delta using Landsat time series imagery and a spatial regression approach

2019 ◽  
Vol 687 ◽  
pp. 1087-1097 ◽  
Author(s):  
Thuong V. Tran ◽  
Duy X. Tran ◽  
Soe W. Myint ◽  
Cho-ying Huang ◽  
Hoa V. Pham ◽  
...  
Keyword(s):  
Time Series ◽  
Spatial Regression ◽  
River Delta ◽  
Mekong River ◽  
Mekong River Delta ◽  
Regression Approach

scholarly journals Impact of credit rationing on capital allocated to inputs used by rice farmers in the Mekong River Delta, Vietnam

2020 ◽  
Vol 22 (1) ◽  
pp. 47-60
Author(s):  
Cao Van Hon ◽  
Le Khuong Ninh
Keyword(s):  
Household Head ◽  
Credit Rationing ◽  
River Delta ◽  
Mekong River ◽  
Probit Regression ◽  
Credit Institution ◽  
Content Type ◽  
Mekong River Delta ◽  
Rice Farmers ◽  
The Impact

PurposeThe purpose of this paper is to estimate the impact of credit rationing on the amount of capital allocated to inputs used by rice farmers in the Mekong River Delta (MRD).Design/methodology/approachBased on the literature review, the authors propose nine hypotheses on the determinants of access of rice farmers to credit and four hypotheses on the impact of credit rationing on the amount of capital allocated to inputs used by rice farmers in the MRD. Data were collected from 1,168 farmer households randomly selected out of 10 provinces (city) in the MRD.FindingsStep 1 of propensity score matching (PSM) with probit regression shows that land value, income, education, gender of household head and geographical distance to the nearest credit institution affect the degree of credit rationing facing rice farmers. Step 2 of PSM estimator identifies that the amount of capital allocated to inputs such as fertilizer and hired labour increases when credit rationing decreases while that allocated to seed and pesticide is not influenced by credit rationing because rice farmers use these inputs adamantly regardless of effectiveness.Originality/valueThis paper sheds light on the impact of credit rationing on the amount of capital allocated to inputs used by rice farmers, which is largely different from the main focus of the extant literature just on the determinants of credit rationing facing farmers in general and rice farmers in particular.

Livelihood impacts of water policy changes: evidence from a coastal area of the Mekong river delta

Water Policy ◽  
2003 ◽  
Vol 5 (5-6) ◽  
pp. 475-488 ◽  
Author(s):  
C.T. Hoanh ◽  
T.P. Tuong ◽  
K.M. Gallop ◽  
J.W. Gowing ◽  
S.P. Kam ◽  
...  
Keyword(s):  
Water Policy ◽  
Environmental Changes ◽  
Extended Period ◽  
River Delta ◽  
Mekong River ◽  
Policy And Practice ◽  
Mekong River Delta ◽  
Balanced Development ◽  
The Government ◽  
The Impact

The coastal zone of the Mekong river delta has experienced rapid economic and environmental changes during the last decade. Given the nature of the environment and the level of dependence on the natural resources base, policies for land and water were very influential in this process. The emphasis on rice created an imperative to control saline intrusion, which was realized through the construction of major engineering works over an extended period (1994-2000). The inertia built up by this process led to a divergence between policy and practice, and adversely affected the livelihoods of fishers and of those farmers who live on aquaculture. This prompted the government to rethink the rice-focus policy, in favor of a land and water policy for balanced rice and aquaculture production. This paper describes an analytical process, which was adopted to explore the feasibility of adopting the new policy for the balanced development of both rice and shrimp production and discusses the impact of the new policy on farmers’ livelihoods.

scholarly journals Water Balance Standardization Approach for Reconstructing Runoff Using GPS at the Basin Upstream

2020 ◽  
Vol 12 (11) ◽  
pp. 1767
Author(s):  
Hok Sum Fok ◽  
Linghao Zhou ◽  
Yongxin Liu ◽  
Robert Tenzer ◽  
Zhongtian Ma ◽  
...  
Keyword(s):  
Water Balance ◽  
Pearson Correlation ◽  
Water Storage ◽  
Remotely Sensed ◽  
River Delta ◽  
Mekong River ◽  
Time Shift ◽  
Mekong River Delta ◽  
Mekong Basin

While in-situ estuarine discharge has been correlated and reconstructed well with localized remotely-sensed data and hydraulic variables since the 1990s, its correlation and reconstruction using averaged GPS-inferred water storage from satellite gravimetry (i.e., GRACE) at the basin upstream based on the water balance standardization (WBS) approach remains unexplored. This study aims to illustrate the WBS approach for reconstructing monthly estuarine discharge (in the form of runoff (R)) at Mekong River Delta, by correlating the averaged GPS-inferred water storage from GRACE of the upstream Mekong Basin with the in-situ R at the Mekong River Delta estuary. The resulting R based on GPS-inferred water storage is comparable to that inferred from GRACE, regardless of in-situ stations within Mekong River Delta being used for the R reconstruction. The resulting R from the WBS approach with GPS water storage converted by GRACE mascon solution attains the lowest normalized root-mean-square error of 0.066, and the highest Pearson correlation coefficient of 0.974 and Nash-Sutcliffe efficiency of 0.950. Regardless of using either GPS-inferred or GRACE-inferred water storage, the WBS approach shows an increase of 1–4% in accuracy when compared to those reconstructed from remotely-sensed water balance variables. An external assessment also exhibits similar accuracies when examining the R estimated at another station location. By comparing the reconstructed and estimated Rs between the entrance and the estuary mouth, a relative error of 1–4% is found, which accounts for the remaining effect of tidal backwater on the estimated R. Additional errors might be caused by the accumulated errors from the proposed approach, the unknown signals in the remotely-sensed water balance variables, and the variable time shift across different years between the Mekong Basin at the upstream and the estuary at the downstream.

The impact of microcredit on rural households in the Mekong River Delta of Vietnam

2014 ◽  
Vol 19 (4) ◽  
pp. 558-578 ◽  
Author(s):  
Dinh Khoi Phan ◽  
Christopher Gan ◽  
Gilbert V. Nartea ◽  
David A. Cohen
Keyword(s):  
Rural Households ◽  
River Delta ◽  
Mekong River ◽  
Mekong River Delta ◽  
The Impact
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