India

Field testing of weighing raingauge - A research report by National Institute of Hydrology
The study by the NIH, attempts to carry out field testing of the weighing raingauge for measurement of rainfall, which is at the core of all hydrological measurements. Posted on 27 Jun, 2010 10:48 PM

The study attempts to carry out field testing of the weighing raingauge for measurement of rainfall, which is at the core of all hydrological measurements. The tipping bucket rain gauges are generally used for automated recording of rainfall data. It has been reported that the tipping bucket mechanism of such raingauges frequently malfunctions and gives erroneous data, especially during high intensity rainstorms.

Single column hydrologic simulation using SHE models - A research report by National Institute of Hydrology
The article is about the European Hydrological System which is physically based distributed model and helps in understanding the importance of evaporation data and soil parameters. Posted on 27 Jun, 2010 10:31 PM

The Systems Hydrologique European – European Hydrological System (SHE) is a physically based distributed model and it provides a useful setup for understanding the importance of evaporation data and soil parameters. 

In this study, single column hydrologic simulations have been carried out for examining the sensitivity of this model to pan evaporation data of the various stations as well as the increase in conductivity of the unsaturated zone. Furthermore, the reduction in the value of exponent appearing in the Averjanov’s formula and reduction in the values of moisture content at wilting point and residual water content has been studied for a single grid of 2 km X 2 km size of the Narmada river.

Analysis of flow to a multi-aquifer well - A research report by National Institute of Hydrology
In this study, unsteady flow towards a fully penetrating well screened in both the aquifers of a two-aquifer system separated by an aquitard has been analyzed using numerical approach. Posted on 27 Jun, 2010 08:51 PM

In this study, unsteady flow towards a fully penetrating well screened in both the aquifers of a two-aquifer system separated by an aquitard has been analyzed using numerical approach. Existence of multi-aquifer systems is common in a sedimentary basin.

Assessment of irrigation return flow - A research report by National Institute of Hydrology
This report presents the methodologies for assessment of irrigation return flow, which is a significant component of water balance of irrigation command areas. Posted on 27 Jun, 2010 08:42 PM

This report presents the various methodologies for correct assessment of irrigation return flow, which is one of the most significant components  in the water balance of irrigation command areas. A part of the water applied to the irrigation fields percolates deep to recharge the groundwater and is known as  irrigation return flow. In this report methodologies have been presented for assessment of irrigation return flow through soil moisture modeling, water balance approach, experimental determination and groundwater modeling. 

Catchment modeling in a Geographical Information Systems environment - A research report by National Institute of Hydrology
The report develops rainfall-runoff modeling for simulating and forecasting the flow from a catchment, and in determining the inflow series for the ungauged catchments. Posted on 27 Jun, 2010 08:32 AM

The report develops rainfall-runoff modeling for simulating and forecasting the flow from a catchment, and in determining the inflow series for the ungauged catchments on the basis of records of gauged catchments.

Because of the scarcity of data, mostly lumped models have been used to model the rainfall-runoff process in a catchment. However distributed models are more accurate and need to be adopted for modeling the complex processes at the scale of basins.

Parameter characterization for solute transport in groundwater - A research report by National Institute of Hydrology
The study attempts to develop a mathematical model for transport of a solute in groundwater by taking the mass balance of the dissolved pollutant over a static elementary volume. Posted on 27 Jun, 2010 08:16 AM

The study attempts to develop a mathematical model for transport of a solute in groundwater by taking the mass balance of the dissolved pollutant over a static elementary volume in three cartesian coordinates.

The management of groundwater resources is becoming a complicated task due to the overwhelming pressure on groundwater and the changing scenario of groundwater quality (physical, chemical and biological). 

The hydraulics of groundwater is governed by many bounded and un-bounded factors. The mixing of constituents in groundwater is an important factor that shapes the occurrence of constituents in any precise location at any given time.

Assessment of probability distribution of Dissolved Oxygen - A research report by National Institute of Hydrology
The report presents a methodology to assess the probability distribution of Dissolved Oxygen (DO) based on the Streeter-Phelp’s equation. Posted on 27 Jun, 2010 07:33 AM

The report presents a methodology to assess the probability distribution of Dissolved Oxygen (DO) based on the Streeter-Phelp’s equation. The methodology involves the use of first order analysis and Monte Carlo simulation to analyze the uncertainty associated with DO. The mean and standard deviation of the parameters have been assumed as same for the study’s probability distributions.

Modeling of flow in the canal due to breach of bank - A research report by National Institute of Hydrology
The study develops the wavelet element method for hydrological application purposes in general and modeling of flow in a canal due to breach of bank because of rainfall and cyclones. Posted on 27 Jun, 2010 12:15 AM

The study develops the wavelet element method for hydrological application purposes in general and modeling of flow in a canal due to breach of bank in particular. Due to high seasonal variability of rainfall and cyclones in coastal India, flood discharges cause frequent breaching of canals.

Canal breach modeling is of great significance in open channel hydraulics. The study of breach of a canal is a relatively new one as compared to dam breach, which is a well researched field. The analysis of the problem is complicated due to dynamics of flow within the canal. The limitations of the above model due to the one-dimensional model analysis of the problem is hoped to be overcome in two or three dimensional analysis.

Rigorous derivation of Hooghoudt’s equation for the drainage spacing - A research report by National Institute of Hydrology
In the study, Hooghoudt's drain spacing formula has been derived rigorously considering the variation in radial flux and the area above drain level in the radial flow zone. Posted on 27 Jun, 2010 12:04 AM

In the study, a drain spacing formula has been derived rigorously considering the variation in radial flux and the area above drain level in the radial flow zone. Hooghoudt’s drain spacing formula is based on an implied assumption that in the radial flow zone there is no spatial variation in the flux and hence no vertical recharge in this zone. The Hooghoudt’s formula computes maximum water table height very close to that computed by the rigorous method.

Mathematical modeling of flows in alluvial conditions - A research report by National Institute of Hydrology
The report presents a detailed review of mathematical modeling of flows in alluvial streams. Various computer codes for this are presented and a model for simple-island case is prepared. Posted on 26 Jun, 2010 02:04 PM

The report presents a detailed review of mathematical modeling of flows in alluvial streams. Various computer codes for this are presented and a model for simple-island case is prepared. Branched flows in open channels with alluvial conditions occur in natural and man-made systems. Analysis of such flows by mathematical modeling is important considering its applications in water resources and environmental engineering.

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