Long‐term Disconnect between Nutrient Inputs and Riverine Exports in a Semi‐arid, Agricultural Watershed: Yakima River Basin 1945‐2012

Abstract. Water management substantially alters natural regimes of streamflow through modifying retention time and water exchanges among different components of the terrestrial water cycle. Accurate simulation of water cycling in intensively managed watersheds, such as the Yakima River Basin (YRB) in the Pacific Northwest of the U.S., faces challenges in reliably characterizing influences of management practices (e.g., reservoir operation and cropland irrigation) on the watershed hydrology. Using the Soil and Water Assessment Tool (SWAT) model, we evaluated streamflow simulations in the YRB based on different reservoir operation and irrigation schemes. Simulated streamflow with the reservoir operation scheme optimized by the RiverWare model better reproduced measured streamflow than the simulation using default SWAT reservoir operation scheme. Scenarios with irrigation practices demonstrated higher water losses through evapotranspiration (ET), and matched benchmark data better than the scenario that only considered reservoir operations. Results of this study highlight the importance of reliably representing reservoir operations and irrigation management for credible modeling of watershed hydrology. Both SWAT and RiverWare are community-based and have been widely tested and applied for reservoir operations and agricultural watershed modeling in regions across the globe. As such, the methods and findings presented here hold the promise to apply to other intensively managed watersheds to enhance water resources assessment.

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Analyzing long-term spatial variability of blue and green water footprints in a semi-arid mountainous basin with MIROC-ESM model (case study: Kashafrood River Basin, Iran)

Theoretical and Applied Climatology ◽

10.1007/s00704-017-2309-0 ◽

2017 ◽

Vol 134 (3-4) ◽

pp. 885-899 ◽

Cited By ~ 2

Author(s):

A. Aghakhani Afshar ◽

Y. Hassanzadeh ◽

M. Pourreza-Bilondi ◽

A. Ahmadi

Keyword(s):

Spatial Variability ◽

River Basin ◽

Green Water ◽

Model Case ◽

Mountainous Basin ◽

Semi Arid

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Transition of fertilizer application and agricultural pollution loads: a case study in the Nhue-Day River basin

Water Science & Technology ◽

10.2166/wst.2015.312 ◽

2015 ◽

Vol 72 (7) ◽

pp. 1072-1081 ◽

Cited By ~ 7

Author(s):

P. H. Giang ◽

H. Harada ◽

S. Fujii ◽

N. P. H. Lien ◽

H. T. Hai ◽

...

Keyword(s):

River Basin ◽

Nutrient Management ◽

Agricultural Waste ◽

Water Environment ◽

Agricultural Runoff ◽

Agricultural Watershed ◽

Chemical Fertilizer ◽

Paddy Fields ◽

Nutrient Inputs ◽

Total N

Rapid socio-economic development in suburban areas of developing countries has induced changes in agricultural waste and nutrient management, resulting in water pollution. The study aimed at estimating agricultural nutrient cycles and their contribution to the water environment. A material flow model of nitrogen (N) and phosphorus (P) was developed focusing on agricultural activities from 1980 to 2010 in Trai hamlet, an agricultural watershed in Nhue-Day River basin, Vietnam. The model focused on the change in household management of human excreta and livestock excreta, and chemical fertilizer consumption. The results showed that the proportion of nutrients from compost/manure applied to paddy fields decreased from 85 to 41% for both N and P between 1980 and 2010. The nutrient inputs derived from chemical fertilizer decreased 6% between 1980 and 2000 for both N and P. Then, these nutrients increased 1.4 times for N and 1.2 times for P from 2000 to 2010. As of 2010, the total inputs to paddy fields have amounted to 435 kg-N/ha/year and 90 kg-P/ha/year. Of these nutrient inputs, 40% of N and 65% of P were derived from chemical fertilizer. Thirty per cent (30%) of total N input was discharged to the water bodies through agricultural runoff and 47% of total P input accumulated in soil.

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Socioeconomic Challenges faced by Basin’s People in India

Think India ◽

10.26643/think-india.v22i2.8730 ◽

2019 ◽

Vol 22 (2) ◽

pp. 296-304

Author(s):

Biplab Tripathy ◽

Tanmoy Mondal

Keyword(s):

River Basin ◽

High Tide ◽

North East ◽

The People ◽

Term Basis ◽

Major River ◽

River Ganga ◽

Basin Region ◽

Basin Area

India is a subcontinent, there huge no of people lived in river basin area. In India there more or less 80% of people directly or indirectly depend on River. Ganga, Brahamputra in North and North East and Mahanadi, Govabori, Krishna, Kaveri, Narmoda, Tapti, Mahi in South are the major river basin in India. There each year due to flood and high tide lots of people are suffered in river basin region in India. These problems destroy the socio economic peace and hope of the people in river basin. There peoples are continuously suffered by lots of difficulties in sort or in long term basis. Few basin regions are always in high alert at the time of monsoon seasons. Sometime due to over migration from basin area, it becomes empty and creates an ultimate loss of resources in India and causes a dis-balance situation in this area.

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